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Tony Pearson is a Master Inventor, Senior IT Architect and Event Content Manager for [IBM Systems for IBM Systems Technical University] events. With over 30 years with IBM Systems, Tony is frequent traveler, speaking to clients at events throughout the world.
Lloyd Dean is an IBM Senior Certified Executive IT Architect in Infrastructure Architecture. Lloyd has held numerous senior technical roles at IBM during his 19 plus years at IBM. Lloyd most recently has been leading efforts across the Communication/CSI Market as a senior Storage Solution Architect/CTS covering the Kansas City territory. In prior years Lloyd supported the industry accounts as a Storage Solution architect and prior to that as a Storage Software Solutions specialist during his time in the ATS organization.
Lloyd currently supports North America storage sales teams in his Storage Software Solution Architecture SME role in the Washington Systems Center team. His current focus is with IBM Cloud Private and he will be delivering and supporting sessions at Think2019, and Storage Technical University on the Value of IBM storage in this high value IBM solution a part of the IBM Cloud strategy. Lloyd maintains a Subject Matter Expert status across the IBM Spectrum Storage Software solutions. You can follow Lloyd on Twitter @ldean0558 and LinkedIn Lloyd Dean.
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Sometimes, it's difficult to explain the products I manage to people outside the IT storage industry. How do you explain FCP vs. FICON, Giant Magnetoresistive (GMR) heads, the SMI-S interface, etc. enough to then explain how your job relates to those technologies. At least my friends and family read this blog, so they can somewhat understand some of the things I am working on. When I visit my folks on Sundays, we sometimes discuss items they read in my blog that week.
In addition to a "take your children to work day", we have discussed within IBM a "take your parents to work day", especially for the young new hires who have a hard time explaining what their new job is to the rest of their family.
The problem is not just your parents, but any of your co-workers old enough to be parents who haven't bothered to keep up with the latest advancements in Web 2.0 technology. Here are some examples:
A project leader working with a technology partner asked if me if there was a difference between a "blog" and a "wiki" and which should his team use. This was not a simple yes/no answer, and involved some explanation, conversation and understanding of what he was trying to accomplish.
For one of my meetings, someone instant-messaged me asking where it was, was it "face-to-face" (F2F) or Conference call (CC). I replied back, "A2A w/CC" (avatar-to-avatar with voice over conference call). When you are meeting other avatars in-world in Second Life, it gets quite distracting having everyone typing away, with their hands and fingers moving furiously, so we use a conference call to complement our 3D interaction.
That's why I was very excited to seeLinden Lab announces voice beta in Second Life. It won't be fully ready until later this year, but adding voice to Second Life will greatly reduce the hurdles we now have trying to coordinate conference calls with in-world activity.
I realize not everyone can keep up with all the new and different technologies, but the social networking aspects of some of these new developments are worth looking into.
Yes, it's Tuesday, and that means more IBM Announcements! A lot was announced today, so I have selected an eclectic mix for your enjoyment.
Microsoft Windows support on IBM Mainframes
Last year's announcement of the new IBM zEnterprise included the zEnterprise BladeCenter Extention (zBX) which could run POWER7 and x86 operating systems, but managed by the mainframe's overall Unified Resource Manager. Initially, this was intended for AIX and Linux-x86, but today, IBM [announced a statement of general direction to support Microsoft Windows] on the zBX extension by end of this year. Of course, the standard disclaimer applies: All statements regarding IBM's plans, directions, and intent are subject to change or withdrawal without notice. Any reliance on these statements of general direction is at the relying party's sole risk and will not create liability or obligation for IBM.
New 15K RPM drives for IBM Storwize V7000
Last October, when IBM introduced the Storwize V7000, it offered both large (3.5 inch) and small form factor (2.5 inch) drives. Unfortunately, a few people were upset that there were no 15K RPM drives for the small form factor models. There were SSD and 10K RPM drives, but nothing in between. Today, IBM [announced new 15K RPM drives of 146GB capacity] have been qualified for both the controller and expansion drawers.
New RVU licensing for IBM Tivoli products
IBM [announced it is changing over to this new RVU licensing model], from the previous PVU license, based on processor value units. What is an RVU? An RVU is a unit of measure by which the program can be licensed. RVU Proofs of Entitlement (PoE) are based on the number of units of a specific resource used or managed by the program. This makes sense, resource management software should be charged by the amount of resources you manage, not the size of the server the software runs on. This change also enables running on server virtualization and live movement of VM guest images from one type of host machine to another.
If you are contemplating a visit to an IBM [Executive Briefing Center], then April and May is a great time to come to Tucson. The weather is ideal here. The cold snap appears to be over, and spring is in the air!
Last night, I presented an E-Talk to the Engineering Student Council (ESC) of the University of Arizona (UofA).
The ESC is the student governing body of The University of Arizona’s College of Engineering. The organization works with scholastic honorary societies, professional organizations, and project clubs to aid and encourage the professional and social development of students. This year, ESC launched a new program, Engineering Talks (E-Talks), consisting of workshops and lectures, which will focus on teaching students what it takes to work within a company, before they enter the workforce. To make this program successful, career advice from professionals working at established companies is essential.
The audience was a mix of undergraduate and graduate engineering students from a variety of disciplines, such as Petroleum, Hydrology, Mining, Biomedical, Electrical and Computer Engineering. Only a few were graduating this May. There were roughly an equal number of boys and girls, which was encouraging. When I was an engineering student at the UofA, women engineers were very rare.
A little about myself, my academic and professional career over the past 30 years, and some background of IBM as a company, how it is organized, and its 100 year Centennial celebration.
An overview of IBM's corporate strategy for Smarter Computing, explaining how IBM is solving the world's toughest challenges for analyzing Big Data, developing Optimized Systems for particular workloads, and new delivery and deployment models for Cloud Computing.
Some career advice, based on my decades of work experience at IBM and elsewhere
After the Q&A, several students stayed around afterwards to ask questions. This seems to happen every time I give a presentation to a mixed audience. I handed out plenty of business cards, and offered to make the charts available to all the students via the IBM Expert Network on Slideshare.net website.
Wrapping up my seven-city romp through Australia and New Zealand, the final city was Canberra, which is the capital of Australia. As with Wellington, this meant many of the clients in the audience work in government agencies.
I had not taken any photos of Anna Wells, IBM Storage Sales Leader for ANZ, but I was able to find this caricature of her on a poster from an award she won within IBM.
I also did not have a picture of Robert, my videographer for this trip, who was always behind the camera himself.
The event went smoothly, just like the rest of them. Anna presented IBM's storage strategy and highlighted specific IBM storage solutions.
I had several emails asking if this event was called "Storage Optimisation Breakfast" because it was held in the mornings, or did we actually serve food at these events. The answer is we actually served food, a variation of the [Full English Breakfast], and most of the attendees gobbled it down while Anna spoke.
The fare was quite similar across all seven locations: scrambled or poached eggs, on toast or english muffin, ham/bacon/sausages, potatoes or mushrooms, and half of a baked tomato with bits of something toasted on top.
One morning, for a change, I decided instead to have a bowl of Weet-Bix cereal. Tasted like cardboard. I learned my lesson.
Next, we had Will Quodling, Manager of Infrastructure Operations, at Australia's Department of Innovation, Industry, Science and Research. The Department of Innovation, Industry, Science and Research consists of 3200 staff that strive to encourage the sustainable growth of Australian industries. The Department is committed to developing policies and delivering programs to provide lasting economic benefits ensuring Australia's competitive future, undertakes analysis, and provides services and advice to the business, science and research community. American President, Barack Obama, visited Australia and was interested in adopting a similar concept for the United States.
The department was looking to replace their existing IBM System Storage DS4800 disk systems with something more energy efficient. They selected IBM XIV storage system, with an expected savings of 10kW per year. They are able to run 800 VMware images and 150 VDI workstations using storage on one XIV, replicate the data to a second XIV at a remote location, and have a third XIV for their Web serving environment. They tested out both single drive and full module failures, and experienced better-than-expected rebuild times, with no impact to users, and no impact to performance.
After 17 days without a functioning government, Australia finally selected a prime minister. Her name is Julia Gillard, shown here. She won in part by promising to build a National Broadband Network (NBN) for the entire country, including the rural areas.
[Canberra] is an interesting town, a fully planned community designed in 1913 by Chicago's husband-and-wife architect team of Walter Burley Griffin and Marion Mahony Griffin. The location was selected as being half-way compromise between Australia's two largest cities, Sydney and Melbourne.
I would like to thank all the wonderful people in both Australia and New Zealand for making this a successful trip!
Continuing my coverage of the IBM Dynamic Infrastructure Executive Summit at the Fairmont Resort in Scottsdale, Arizona, we had a day full main-tent sessions. Here is a quick recap of the sessions presented in the afternoon.
Taming the Information Explosion
Doug Balog, IBM Vice President and Disk Storage Business Line Executive, presented on the information explosion. Storage Admins are focused on managing storage growth and the related costs and complexity, proper forecasting and capacity planning, and backup administration. IBM's strategy is to help clients in the following areas:
Storage Efficiency - getting the most use out of the resources you invest
Service Delivery - ensuring that information gets to the right people at the right time
Data Protection - protecting data against unethical tampering, unauthorized access, and unexpected loss and corruption
Cory Vokey, Senior Manager of IT Systems Operations at Research in Motion, Ltd., the people who bring you BlackBerry phone service, provided a client testimonial for the XIV storage system. Before the XIV, RIM suffered high storage costs and per-volume software licensing. Over the past 15 months, RIM deployed XIV as a corporate standard. With the XIV, they have had 100 percent up-time, and enjoyed 50 percent costs savings compared to their previous storage systems. They have increased capacity 300 percent, without any increase to their storage admin staff. XIV has greatly improved their procurement process, as they no longer need to "true up" their software licenses to the volume of data managed, a sore point with their previous storage vendor.
Mainframe Innovations and Integration
Tom Rosamillia, IBM General Manager of the System z mainframe platform, presented on mainframe servers. After 40 years, IBM's mainframe remains the gold standard, able to handle hundreds of workloads on a single server, facilitating immediate growth with scalability. The key values of the System z mainframe are:
Industry leading virtualization, management and qualities of service
A comprehensive portfolio for business intelligence and data warehousing
The premier platform for modernizing the enterprise
A large and growing portfolio of leading-applications ISV support
Steve Phillips, CIO of Avnet, presented the client testimonial for their use of a System z10 mainframe. Last year, Avnet was ranked Fortune's Number One "Most admired" for Technology distribution. Avnet distributes technology from 300 suppliers to over 100,000 resellers, ISVs and end users. They have modernized their system running SAP on System z with DB2 as the database management system, using Hypersockets virtual LAN inside the server to communicate between logical partitions (LPARs). The folks at Avnet especially like the ability for on-the-fly re-assignment of capacity. This is used for end-of-quarter peak processing, and to adjust between test and development workloads. They also like the various special purpose engines available:
z Integrated Information Processor (zIIP) for DB2 workloads
z Application Assist Processor (zAAP) for Java processing under WebSphere
Integrated Facility for Linux (IFL) for Linux applications
Cloud Computing: Real Capabilities, Real Stories
Mike Hill, IBM Vice President of Enterprise Initiatives, presented on IBM's leadership in cloud computing. He covered three trends that are driving IT today. First, there is a consumerization and industrialization of IT interfaces. Second, a convergence of the infrastructure that is driving a new focus on standards. Third, delivering IT as a service has brought about new delivery choices. The result is cloud computing, with on-demand self-service, ubiquitous network access, location-independent resource pooling, rapid elasticity, and flexible pricing models. Government agencies and businesses in Retail, Manufacturing and Utilities are leading the charge to cloud computing.
Mike covered IBM's five cloud computing deployment models, and shared his views on which workloads might be ready for cloud, and which may not be there yet. Organizations are certainly seeing significant results: reduced labor costs, improved capital utilization, reduced provisioning cycle times, improved quality through reduced software defects, and reduced end user IT support costs.
Mitch Daniels, Director of Technology at ManTech International Corporation, presented the customer testimonial for an IBM private cloud for Development and Test. Mantech chose a private cloud as they work with US Federal agencies like Department of Defense, Homeland Security and the Intelligence community. The private cloud was built from:
IBM Cloudburst virtualized server environment
Tivoli Unified Process to document process and workflow
Tivoli Service Automation Manager to request, deliver and manage IT services
Tivoli Self-Service Portal and Service Catalog to allow developers and testers to request resources as needed
The result: Mantech saved 50 percent in labor costs, and can now provision development and test resources in minutes instead of weeks.
The IBM Transformation Story
Leslie Gordon, IBM Vice President of Application and Infrastructure Services Management, presented IBM's own transformation story, becoming the premier "Globally Integrated Enterprise". Based on IBM's 2009 CIO study, CIOs must balance three roles with seemingly contradictory demands:
Make innovations real, be both an insightful visionary but also an able pragmatist
Raise the Return on Investment (ROI) of IT, determine savvy ways to create value but also be ruthless at cutting costs
Expanding the business impact of IT, be a collaborative business leader with the other C-level executives, but also be an inspiring manager for the IT staff.
In this case, IBM drinks its own champagne, using its own solutions to help run its internal operations. In 1997, IBM used over 15,000 applications, but this has been simplified down to 4500 applications today. Thousands of servers were consolidated to Linux on System z mainframes. The applications workloads were categorized as Blue, Bronze, Silver, and Gold to help prioritize the consolidation. IBM's key lessons from all this were:
Gather data at the business unit level, but build the business case from an enterprise view.
Start small and monitor progress continually, run operations concurrently with transformational projects
Address cultural and organizational changes by deploying transformation in waves
I found the client testimonials insightful. It is always good to hear that IBM's solutions work "as advertised" right out of the box.
Wrapping up my week's theme of "diversity", with posts on a diverse set of topics,today I will suggest ways to spendyour time while you are walking 10,000 steps per day, as recommended by the authorsof the book "You: On a Diet".
(If you thought this was about the 10,000 steps it might take to implement a storage solution, you should switch over to IBM as your storage vendor. For example, the DS3200 and DS3400 can beimplemented in as little as SIX steps. That's pretty cool.)
Blogs like Lifehacker are an excellent resource for neat littletips and tricks to help you throughout your day, like how to use your iPod, cell phone or computer better, for example. These suggestions are based on the idea that you can walk your 10,000 steps with access to an iPod and cell phone.
Learning a language
... or refreshing yourself on a language you might not have spoken in a while. In addition to formal audio-based lessons from Pimsleur, there are podcasts you can get for various languages. In preparation for my upcoming trip to Japan and China, I have been listening to JapanesePod101.com and ChinesePod.com which have quick lessons that complement the formal training.This Lifehacker postindicates there are similar ones for French, Spanish, Italian, and Brazillian Portuguese.
Practicing your presentation
Walking while practicing your 30-60 minute presentation would be good exercise.MicroPersuasion explains how to turn your iPod into the ultimate PowerPoint accessory, and this article in PlayListmag.com providesthe steps to get a PowerPoint presentation onto your iPod. I did this, and the slides are found underPhotos->Photo Library. The images are small, but heck, they are your charts and you should recognize themwell enough to remind yourself what to say on each slide.Also, I am able to record my practice sessions using MP3 Recorder and listen as I page through each slide. (In theory, you can use your iPod to present your slides to your audience, plugging the iPod directly into the laptop projector, instead of a laptop, using cables available at your local Apple store, and use the iPod controls as your forward/backward remote.)
Working your To-Do list
You can download your to-do list to your iPod. I use BackPackIt from 37 Signals. You can sign up for a free account, or upgrade to a paid account, and have anamazingly simple browser-based tool to develop your to-do lists, one for each project or aspect of your life. Oncedone, the list can be emailed to you as plain text. Enable your iPod as an "external disk drive" and copy this text file to your NOTES directory on the iPod drive. Voila! You can now read your to-do list! (I could also send it to my cell phone, using email@example.com, but I find the iPod easier to read and navigate)
Think of something to add? Send an email from your cell phone. With BackPackit, I can send an email that will directly add my text as a note or todo list item. On my phone, this is simply sending a text message to "500" with text like:
"firstname.lastname@example.org todo # buy bread".
The hash mark (#) separates the subject line from the body of the email, and this is how Backpackit knows its a todo item or a note. If you pre-program the huge email address in advance on your phone, then it isn't as bad as it looks. It will be on your packpackit page the next time you log in.
Well, that's three suggestions. The next time you complain that there is no time to walk, you now have no excuse.
This week, IBM celebrates its Centennial, 100 years since its incorporation on June 16, 1911.
A few months ago, the Tucson Executive Briefing Center ordered its latest IBM System Storage [DS8800] to be on display for demos. This was manufactured in Vác, Hungary (about an hour north of Budapest), and was going to be shipped over to the United States.
However, Sam Palmisano, IBM Chairman and CEO, was in Hannover, Germany for the [CeBIT conference] and wanted this DS8800 to be re-directed to Germany first for this event. He was kind enough to sign it for us. Brian Truskowski, IBM General Manager for Storage, and Rod Adkins, IBM Senior Vice President for IBM Systems Technolgoy Group (and my fifth-line manager), also signed this as well!
I am pleased to say this "signed" DS8000 has arrived to Tucson. This is the latest model in a family of market-leading high-end enterprise-class disk systems designed to attach to all computers, including System z mainframes, POWER systems running AIX and IBM i, as well as servers running HP-UX, Solaris, Linux or Windows.
For more on IBM's other innovations over the past 100 years, check out the [Icons of Progress], which includes these storage innovations:
Continuing my coverage of the Data Center Conference, held Dec 1-4 in Las Vegas, an analyst presented the challenges of managing the rapid growth in storage capacity. Administrators ability to manage storage is not keeping up with the growth. His recommendations:
Aim to just meet but not exceed service level agreements (SLAs)
Revisit past IT decisions. This includes evaluating your SAN to NAS ratio.
Embrace new technologies when they are effective, this includes cloud storage, solid state drives, and interconnect technologies like FCoCEE.
Follow vendor management best practices, update your vendor "short list".
A survey of the audience found:
20 percent have a single external storage vendor
39 percent have two external storage vendors
18 percent have three external storage vendors
23 percent have four or more external storage vendors
Throughout the industry, storage vendors are following IBM's example of using commodity hardware parts. This is because custom ASICs are expensive, and changes take a minimum of three months development time. Software-based implementations can be updated more quickly.
In terms of technologies deployed of SAN, NAS, Compliance Archive (such as the IBM Information Archive), and Virtual Tape Library (VTL) such as the IBM TS7650 ProtecTIER data deduplications solution, here was the survey of the audience:
8 percent: SAN only
14 percent: SAN and NAS
23 percent: SAN, NAS and Compliance Archive
9 percent: SAN and VTL
14 percent: SAN, NAS and VTL
32 percent: SAN, NAS, Compliance Archive and VTL
Cost reduction techniques including thin provisioning, compression, data deduplication, Quality of Service tiers, and archiving. To reduce power and cooling requirements, switch from FC to SATA disk wherever possible, and move storage out of the data center, such as on tape cartridges or cloud storage.
For emerging technologies, the following survey:
16 percent have already implemented a new emerging technology (IBM XIV, Pillar, 3PAR, etc.)
30 percent plan to do so in 12-24 months
4 percent plan to do so in 24-48 months
50 percent have no plans, and will continue to stick with traditional storage technologies
As for adopting Cloud storage, here was the survey:
14 percent already have
31 percent plan to use Cloud storage in 12-24 months
13 percent plan to use Cloud storage in 24-48 months
42 percent have no plans to adopt Cloud storage
My take-away from this is that many companies are still "exploring" into different options available to them. Fortunately, IBM offers a broad portfolio of complete end-to-end solutions to make acquiring the right mix of technologies that are optimized for your workloads possible.
Storage Networking World conference is over, and the buzz from the analysts appears to be focused onXiotech's low-cost RAID brick (LCRB) called Intelligent Storage Element, or ISE.
(Full disclosure: I work for IBM, not Xiotech, in case there weren't enough IBM references on this blog page to remindyou of that. I am writing this piece entirely from publicly available sources of information, and notfrom any internal working relationships between IBM and Xiotech. Xiotech is a member of the IBM BladeCenteralliance and our two companies collaborate together in that regard.)
Fellow blogger Jon Toigo in his DrunkenData blog posted [I’m Humming “ISE ISE Baby” this Week] and then a follow-up post[ISE Launches]. I looked up Xiotech's SPC-1benchmark numbers for the Emprise 5000 with both 73GB and 146GB drives, and at 8,202 IOPS per TB, does not seem to be as fast as IBM SAN VolumeControllers 11,354 IOPS per TB. Xiotech offers an impressive 5 year warranty (by comparison, IBM offers up to 4 years, and EMC I think is stillonly 90 days).Jon also wrote a review in [Enterprise Systems]that goes into more detail about the ISE.
Fellow blogger Robin Harris in his StorageMojo blog posted [SNW update - Xiotech’s ISE and the dilithium solution], feeling that Xiotech should win the "Best Announcement at SNW" prize. He points to the cool video on the[Xiotech website]. In that video, they claim 91,000 IOPS.Given that it took forty(40) 73GB drives (or 4 datapacs) in the previous example to get 8,202 IOPS for 1TB usable, I am guessing the 91,000 IOPS is probably 44 datapacs (440 drives) glommed together, representing 11TB usable.The ISE design appears very similar to the "data modules" used in IBM's XIV Nextra system.
Fellow blogger Mark Twomey from EMC in his StorageZilla blog posted[Xiotech: Industry second]correctly points out that Xiotech's 520-byte block (512 bytes plus extra for added integrity) was not the firstin the industry. Mark explains that EMC CLARiiON had this since the early 1990's, and implies in the title that this must have been the first in the industry, making Xiotech an industry second. Sorry Mark, both EMC and Xiotech were late to the game. IBM had been using 520-byte blocksize on its disk since 1980 with the System/38. This system morphed to the AS/400, and the blocksize was bumped up to 522 bytes in 1990, and is now called the System i, where the blocksize was bumped up yet again to 528 bytes in 2007.
While IBM was clever to do this, it actually means fewer choices for our System i clients, being only able to chooseexternal disk systems that explicitly support these non-standard blocksize values, such as the IBM System Storage DS8000and DS6000 series. (Yes, BarryB, IBM still sells the DS6000!) The DS6000 was specifically designed with the System i and smaller System z mainframes in mind, and in that niche does very well. Fortunately, as I mentioned in my February post [Getting off the island - the new i5/OS V6R1], IBM has now used virtualization, in the form of the VIOS logical partition, to allow i5/OS systems to attach to standard 512-byte block devices, greatly expanding the storage choices for our clients.
(Side note: SNW happens twice per year, so the challenge is having something new and fresh to talk about each time. While Andy Monshaw, General Manager of IBM System Storage, highlighted some of the many emerging technologies in his keynote address, IBM shipped on many of them prior to his last appearance in October 2007: thin provisioning in the IBM System Storage N series, deduplication in the IBM System Storage N series Advanced Single Instance Storage (A-SIS) feature, and Solid State Disk (SSD) drives in the IBM BladeCenter HS21-XM models. Of course, not everyone buys IBM gear the first day it is available, and IBM is not the only vendor to offer these technologies. My point is that for many people, these are still not yet deployed in their own data center, and so they are still in the future for them. However, since these IBM deliveries happened more than six months ago, they're old news in the eyes of the SNW attendees. While those who follow IBM closely would know that, others like[Britney Spears] may not.)
Back in the 1990s, when IBM was developing the IBM SAN Volume Controller (SVC), we generically called the managed disk arrays that were being virtualized by the SVC as "low-cost RAID brick" or LCRB. The IBM DS3400 is a good example of this. However, as we learned, SVC is not just for LCRB, it adds value in front of all kinds of disk systems, including the not-so-low-cost EMC DMX and IBM DS8000 disk systems. ISE might make a reasonable back-end managed disk device for IBM SVC to virtualize. This gives you the new cool features of Xiotech's ISE, with IBM SVC's faster performance, more robust functionality and advanced copy services.
Next week, I'll be in South America in meetings with IBM Business Partners and storage sales reps.
Yesterday, I started this week's topic discussing the various areas of exploration to helpunderstand our recent press release of the IBM System Storage SAN Volume Controller and itsimpressive SPC-1 and SPC-2 benchmark results that ranks it the fastest disk system in the industry.
Some have suggested that since the SVC has a unique design, it should be placed in its own category,and not compared to other disk systems. To address this, I would like to define what IBM meansby "disk system" and how it is comparable to other disk systems.
When I say "disk system", I am going to focus specifically on block-oriented direct-access storage systems, which I will define as:
One or more IT components, connected together, that function as a whole, to serve as a target forread and write requests for specific blocks of data.
Clarification: One could argue, and several do in various comments below, that there are other typesof storage systems that contain disks, some that emulate sequential access tape libraries, some that emulate file-systems through CIFS or NFS protocols, and some that support thestorage of archive objects and other fixed content. At the risk of looking like I may be including or excluding such to fit my purposes, I wanted to avoid apples-to-orangescomparisons between very different access methods. I will limit this exploration to block-oriented, direct-access devices. We can explore these other types of storage systems in later posts.
People who have been working a long time in the storage industry might be satisfied by this definition, thinkingof all the disk systems that would be included by this definition, and recognize that other types of storage liketape systems that are appropriately excluded.
Others might be scratching their heads, thinking to themselves "Huh?" So, I will provide some background, history, and additional explanation. Let's break up the definition into different phrases, and handle each separately.
read and write requests
Let's start with "read and write requests", which we often lump together generically as input/output request, or just I/O request. Typically an I/O request is initiated by a host, over a cable or network, to a target. The target responds with acknowledgment, data, or failure indication. A host can be a server, workstation, personal computer, laptop or other IT device that is capable of initiating such requests, and a target is a device or system designed to receive and respond to such requests.
(An analogy might help. A woman calls the local public library. She picks up the phone, and dials the phone number of the one down the street. A man working at the library hears the phone ring, answers it with "Welcome to the Public Library! How can I help you?" She asks "What is the capital city of Ethiopia?" and replies "Addis Ababa." and hangs up. Satisfied with this response, she hangs up. In this example, the query for information was the I/O request, initiated by the lady, to the public library target)
Today, there are three popular ways I/O requests are made:
CCW commands over OEMI, ESCON or FICON cables
SCSI commands over SCSI, Fibre Channel or SAS cables
SCSI commands over Ethernet cables, wireless or other IP communication methods
specific blocks of data
In 1956, IBM was the first to deliver a disk system. It was different from tape because it was a "direct access storage device" (the acronym DASD is still used today by some mainframe programmers). Tape was a sequential media, so it could handle commands like "read the next block" or "write the next block", it could not directly read without having to read past other blocks to get to it, nor could it write over an existing block without risking overwriting the contents of blocks past it.
The nature of a "block" of data varies. It is represented by a sequence of bytes of specific length. The length is determined in a variety of ways.
CCW commands assume a Count-Key-Data (CKD) format for disk, meaning that tracks are fixed in size, but that a track can consist of one or more blocks, and can be fixed or variable in length. Some blocks can span off the end of one track, and over to another track. Typical block sizes in this case are 8000 to 22000 bytes.
SCSI commands assume a Fixed-Block-Architecture (FBA) format for disk, where all blocks are the same size, almost always a power of two, such as 512 or 4096 bytes. A few operating systems, however, such as i5/OS on IBM System i machines, use a block size that doesn't follow this power-of-two rule.
one or more IT components
You may find one or more of the following IT components in a disk system:
motorized platter(s) covered in magnetic coating with a read/write head to move over its surface. These are often referred to as Hard Disk Drive (HDD) or Disk Drive Modules (DDM), and are manufacturedby companies like Seagate or Hitachi Global Storage Technologies.
A set of HDD can be accessed individually, affectionately known as JBOD for Just-a-bunch-of-disk, or collectively in a RAID configuration.
Memory can act as the high-speed cache in front of slower storage, or as the storage itself. For example, the solid state disk that IBM announced last week is entirely memory storage, using Flash technology.
Lately, there are two popular packaging methods for disk systems:
Monolithic -- all the components you need connected together inside a big refrigerator-sized unit, with options to attach additional frames. The IBM System Storage DS8000, EMC Symmetrix DMX-4 and HDS TagmaStore USP-V all fit this category.
Modular -- components that fit into standard 19-inch racks, often the size of the vegetable drawer inside a refrigerator, that can be connected externally with other components, if necessary, to make a complete disk system. The IBM System Storage DS6000, DS4000, and DS3000 series, as well as our SVC and N series, fall into this category.
Regardless of packaging, the general design is that a "controller" receives a request from its host attachment port, and uses its processors and cache storage to either satisfy the request, or pass the request to the appropriate HDD,and the results are sent back through the host attachment port.
In all of the monolithic systems, as well as some of the modular ones, the controller and HDD storage are contained in the same unit. On other modular systems, the controller is one system, and the HDD storage is in a separate system, and they are cabled together.
serve as a target
The last part is that a disk system must be able to satisfy some or all requests that come to it.
(Using the same analogy used above, when the lady asked her question, the guy at the public library knew the answer from memory, and replied immediately. However, for other questions, he might need to look up the answer in a book, do a search on the internet, or call another library on her behalf.)
Some disk systems are cache-only controllers. For these, either the I/O request is satisfied as a read-hit or write-hit in cache, or it is not, and has to go to the HDD. The IBM DS4800 and N series gateways are examples of this type of controller.
Other systems may have controller and disk, but support additional disk attachment. In this case, either the I/O request is handled by the cache or internal disk, or it has to go out to external HDD to satisfy the request. IBM DS3000 series, DS4100, DS4700, and our N series appliance models, all fall into this category.
So, the SAN Volume Controller is a disk system comprising of one to four node-pairs. Each node is a piece of IT equipment that have processors and cache. These node-pairs are connected to a pair of UPS power supplies to protect the cache memory holding writes that have not yet been de-staged. The combination of node-pairs and UPS acting as a whole, is able to serve as a target to SCSI commands sent over Fibre Channel cables on a Storage Area Network (SAN). To read some blocks of data, it uses its internal cache storage to satisfy the request, and for others, it goes out to external disk systems that contain the data required. All writes are satisfied immediately in cache on the SVC, and later de-staged to external disk when appropriate.
As of end of 2Q07, having reached our four-year anniversary for this product, IBM has sold over 9000 SVC nodes, which are part of more than 3100 SVC disk systems. These things are flying off the shelves, clocking in a 100% YTY growth over the amount we sold twelve months ago. Congratulations go to the SVC development team for their impressive feat of engineering that is starting to catch the attention of many customers and return astounding results!
So, now that I have explained why the SVC is considered a disk system, tomorrow I'll discuss metrics to measure performance.