Tony Pearson is a Master Inventor and Senior IT Architect for the IBM Storage product line at the
IBM Executive Briefing Center in Tucson Arizona, and featured contributor
to IBM's developerWorks. In 2016, Tony celebrates his 30th year anniversary with IBM Storage. He is
author of the Inside System Storage series of books. This blog is for the open exchange of ideas relating to storage and storage networking hardware, software and services.
(Short URL for this blog: ibm.co/Pearson )
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Well, I'm back safely from my tour of Asia. I am glad to report that Tokyo, Beijing and Kuala Lumpur are pretty much how I remember them from the last time I was there in each city. I have since been fighting jet lag by watching the last thirteen episodes of LOST season 6 and the series finale.
Recently, I have started seeing a lot of buzz on the term "Storage Federation". The concept is not new, but rather based on the work in database federation, first introduced in 1985 by [A federated architecture for information management] by Heimbigner and McLeod. For those not familiar with database federation, you can take several independent autonomous databases, and treat them as one big federated system. For example, this would allow you to issue a single query and get results across all the databases in the federated system. The advantage is that it is often easier to federate several disparate heterogeneous databases than to merge them into a single database. [IBM Infosphere Federation Server] is a market leader in this space, with the capability to federate DB2, Oracle and SQL Server databases.
Storage expansion: You want to increase the storage capacity of an existing storage system that cannot accommodate the total amount of capacity desired. Storage Federation allows you to add additional storage capacity by adding a whole new system.
Storage migration: You want to migrate from an aging storage system to a new one. Storage Federation allows the joining of the two systems and the evacuation from storage resources on the first onto the second and then the first system is removed.
Safe system upgrades: System upgrades can be problematic for a number of reasons. Storage Federation allows a system to be removed from the federation and be re-inserted again after the successful completion of the upgrade.
Load balancing: Similar to storage expansion, but on the performance axis, you might want to add additional storage systems to a Storage Federation in order to spread the workload across multiple systems.
Storage tiering: In a similar light, storage systems in a Storage Federation could have different capacity/performance ratios that you could use for tiering data. This is similar to the idea of dynamically re-striping data across the disk drives within a single storage system, such as with 3PAR's Dynamic Optimization software, but extends the concept to cross storage system boundaries.
To some extent, IBM SAN Volume Controller (SVC), XIV, Scale-Out NAS (SONAS), and Information Archive (IA) offer most, if not all, of these capabilities. EMC claims its VPLEX will be able to offer storage federation, but only with other VPLEX clusters, which brings up a good question. What about heterogenous storage federation? Before anyone accuses me of throwing stones at glass houses, let's take a look at each IBM solution:
IBM SAN Volume Controller
The IBM SAN Volume Controller has been doing storage federation since 2003. Not only can IBM SAN Volume Controller bring together storage from a variety of heterogenous storage, the SVC cluster itself can be a mix of different hardware models. You can have a 2145-8A4 node pair, 2145-8G4 node pair, and the new 2145-CF8 node pair, all combined together into a single SVC cluster. Upgrading SVC hardware nodes in an SVC cluster is always non-disruptive.
IBM XIV storage system
The IBM XIV has two kinds of independent modules. Data modules have processor, cache and 12 disks. Interface modules are data modules with additional processor, FC and Ethernet (iSCSI) adapters. Because these two modules play different roles in an XIV "colony", that number of each type is predetermined. Entry-level six-module systems have 2 interface and 4 data modules. Full 15-module systems have 6 interface and 9 data modules. Individual modules can be added or removed non-disruptively in an XIV.
IBM Scale-Out NAS
The SONAS is comprised of three kinds of nodes that work together in concert. A management node, one or more interface nodes, and two or more storage nodes. The storage nodes are paired to manage up to 240 nodes in a storage pod. Individual interface or data nodes can be added or removed non-disruptively in the SONAS. The underlying technology, the General Parallel File System, has been doing storage federation since 1996 for some of the largest top 500 supercomputers in the world.
IBM Information Archive (IA)
For the IA, there are 1, 2 or 3 nodes, which manages a set of collections. A collection can either be file-based using industry-standard NAS protocols, or object-based using the popular System Storage™ Archive Manager (SSAM) interface. Normally, you have as many collections as you have nodes, but nodes are powerful enough to manage two collections to provide N-1 availability. This allows a node to be removed, and a new node added into the IA "colony", in a non-disruptive manner.
Even in an ant colony, there are only a few types of ants, with typically one queen, several males, and lots of workers. But all the ants are red. You don't see colonies that mix between different species of ants. For databases, federation was a way to avoid the much harder task of merging databases from different platforms. For storage, I am surprised people have latched on to the term "federation", given our mixed results in the other "federations" we have formed, which I have conveniently (IMHO) ranked from least effective to most effective:
The Union of Soviet Socialist Republics (USSR)
My father used to say, "If the Soviet Union were in charge of the Sahara desert, they would run out of sand in 50 years." The [Soviet Union] actually lasted 68 years, from 1922 to 1991.
The United Nations (UN)
After the previous League of Nations failed, the UN was formed in 1945 to facilitate cooperation in international law, international security, economic development, social progress, human rights, and the achieving of world peace by stopping wars between countries, and to provide a platform for dialogue.
The European Union (EU)
With the collapse of the Greek economy, and the [rapid growth of debt] in the UK, Spain and France, there are concerns that the EU might not last past 2020.
The United States of America (USA)
My own country is a federation of states, each with its own government. California's financial crisis was compared to the one in Greece. My own state of Arizona is under boycott from other states because of its recent [immigration law]. However, I think the US has managed better than the EU because it has evolved over the past 200 years.
The Organization of the Petroleum Exporting Countries [OPEC]
Technically, OPEC is not a federation of cooperating countries, but rather a cartel of competing countries that have agreed on total industry output of oil to increase individual members' profits. Note that it was a non-OPEC company, BP, that could not "control their output" in what has now become the worst oil spill in US history. OPEC was formed in 1960, and is expected to collapse sometime around 2030 when the world's oil reserves run out. Matt Savinar has a nice article on [Life After the Oil Crash].
United Federation of Planets
The [Federation] fictitiously described in the Star Trek series appears to work well, an optimistic view of what federations could become if you let them evolve long enough.
Given the mixed results with "federation", I think I will avoid using the term for storage, and stick to the original term "scale-out architecture".
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.
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 morning.
Leadership and Innovation on a Smarter Planet
Todd Kirtley, IBM General Manager of the western United States, kicked off the day. He explained that we are now entering the Decade of Smart: smarter healthcare, smarter energy, smarter traffic systems, and smarter cities, to name a few. One of those smarter cities is Dubuque, Iowa, nicknamed the Masterpiece of the Mississippi river. Mayor Roy Boul of Dubuque spoke next on his testimonial on working with IBM. I have never been to Dubuque, but it looks and sounds like a fun place to visit. Here is the [press release] and a two-minute [video].
Smarter Systems for a Smarter Planet
Tom Rosamillia, IBM General Manager of the System z mainframe platform, presented on smarter systems. IBM is intentionally designing integrated systems to redefine performance and deliver the highest possible value for the least amount of resource. The five key focus areas were:
Enabling massive scale
Organizing vast amounts of data
Turning information into insight
Increasing business agility
Managing risk, security and compliance
The Future of Systems
Ambuj Goyal, IBM General Manager of Development and Manufacturing, presented the future of systems. For example, reading 10 million electricity meters monthly is only 120 million transactions per year, but reading them daily is 3.65 billion, and reading them every 15 minutes will result in over 350 billion transactions per year. What would it take to handle this? Beyond just faster speeds and feeds, beyond consolidation through virtualization and multi-core systems, beyond pre-configured fit-for-purpose appliances, there will be a new level for integrated systems. Imagine a highly dense integration with over 3000 processors per frame, over 400 Petabytes (PB) of storage, and 1.3 PB/sec bandwidth. Integrating software, servers and storage will make this big jump in value possible.
POWERing your Planet
Ross Mauri, IBM General Manager of Power Systems, presented the latest POWER7 processor server product line. The IBM POWER-based servers can run any mix of AIX, Linux and IBM i (formerly i5/OS) operating system images. Compared to the previous POWER6 generation, POWER7 are four times more energy efficient, twice the performance, at about the same price. For example, an 8-socket p780 with 64 cores (eight per socket) and 256 threads (4 threads per core) had a record-breaking 37,000 SAP users in a standard SD 2-tier benchmark, beating out 32-socket and 64-socket M9000 SPARC systems from Oracle/Sun and 8-socket Nehalem-EX Fujitsu 1800E systems. See the [SAP benchmark results] for full details. With more TPC-C performance per core, the POWER7 is 4.6 times faster than HP Itanium and 7.5 times faster than Oracle Sun T5440.
This performance can be combined with incredible scalability. IBM's PowerVM outperforms VMware by 65 percent and provides features like "Live Partition Mobility" that is similar to VMware's VMotion capability. IBM's PureScale allows DB2 to scale out across 128 POWER servers, beating out Oracle RAC clusters.
The final speaker in the morning was Greg Lotko, IBM Vice President of Information Management Warehouse solutions. Analytics are required to gain greater insight from information, and this can result in better business outcomes. The [IBM Global CFO Study 2010] shows that companies that invest in business insight consistently outperform all other enterprises, with 33 percent more revenue growth, 32 percent more return on invested (ROI) capital, and 12 times more earnings (EBITDA). Business Analytics is more than just traditional business intelligence (BI). It tries to answer three critical questions for decision makers:
What is happening?
Why is it happening?
What is likely to happen in the future?
The IBM Smart Analytics System is a pre-configured integrated system appliance that combines text analytics, data mining and OLAP cubing software on a powerful data warehouse platform. It comes in three flavors: Model 5600 is based on System x servers, Model 7600 based on POWER7 servers, and Model 9600 on System z mainframe servers.
IBM has over 6000 business analytics and optimization consultants to help clients with their deployments.
While this might appear as "Death by Powerpoint", I think the panel of presenters did a good job providing real examples to emphasize their key points.
Wrapping up my coverage of the IBM Dynamic Infrastructure Executive Summit at the Fairmont Resort in Scottsdale, Arizona, we had a final morning of main-tent sessions. Here is a quick recap of the sessions presented Thursday morning. This left the afternoon for people to catch their flights or hit the links.
Data Center Actions your CFO will Love
Steve Sams, IBM Vice President of Global Site and Facilities, presented simple actions that can yield significant operational and capital cost savings. The first focus area was to extend the life of your existing data center. Some 70 percent of data centers are 10-15 years old or worse, and therefore not designed for today's computational densities. IBM did this for its Lexington data center, making changes that resulted in 8x capability without increasing footprint.
The second focus area was to rationalize the infrastructure across the organization. The process of "rationalizing" involves determining the business value of specific IT components and deciding whether the business value justifies the existing cost and complexity. It allows you to prioritize which consolidations should be done first to reduce costs and optimize value. IBM's own transformation reduced 128 CIOs down to a single CIO, and from 155 host data centers scattered were consolidated down to seven, and 80 web hosting data centers down to five. This also included consolidating 31 intranets down to a single global intranet.
The third focus area was to design your new infrastructure to be more responsive to change. IBM offers four solutions to help those looking to build or upgrade their data center:
Scalable Modular Data Center - save up to 20 percent than traditional deployments with turn-key configurations from 500 to 2500 square feet that can be deployed in as little as 8-12 weeks to an existing floorspace.
Enterprise Modular Data Center - save 40 to 50 percent with 5000 square foot standardized design for larger data centers. This modular approach provides a "pay as you grow" approach that can be more responsive to future unforeseen needs.
Portable Modular Data Center - this is the PMDC shipping container that was sitting outside in the parking lot. This can be deployed anywhere in 12-14 weeks and is ideal for dealing with disaster recoveries or situations where traditional data center floor plans cannot be built fast enough.
High Density Zone - this can help increase capacity in an existing data center without a full site retrofit.
Here is a quick [video] that provides more insight.
Neil Jarvis, CIO of American Automobile Association (AAA) for Northern California, Nevada and Utah (NCNU), provided the customer testimonial. Last September, the [AAA NCNU selected IBM] to build them an energy-efficient green data center. Neil provided us an update now six months later, managing the needs of 4 million drivers.
Virtualization - Managing the World's Infrastructure
Helene Armitage, IBM General Manager of the newly formed IBM System Software product line, presented on virtualization and management. Virtualization is becoming much more than a way of meeting the demand for performance, capability, and flexibility in the data center. It helps create a smarter, more agile data center. Her presentation focused on four areas: consolidate resources, manage workloads, automate processes, and optimize the delivery of IT services.
Charlie Weston, Group Vice President of Information Technology at Winn Dixie, one of the largest food retailers in the United States, with over 500 stores and supermarkets. The grocery business is highly competitive with tight profit margins. Winn Dixie wanted to deploy business continuity/disaster recovery (BC/DR) while managing IT equipment scattered across these 500 locations. They were able to consolidate 600 stand-alone servers into a single corporate data center. Using IBM AIX with PowerVM virtualization on BladeCenter, each JS22 blade server could manage 16 stores. These were mirrored to a nearby facility, as well as a remote disaster recovery center. They were also able to add new Linux application workloads to their existing System z9 EC mainframe. The result was to free up $5 million US dollars in capital that could be used to remodel their stores, and improve application performance 5-10 times. They were able to deploy a new customer portal on Linux for System z in days instead of months, and have reduced their disaster recovery time objective (RTO) against hurricanes from days to hours. Their next steps involves looking at desktop virtualization.
Redefining x86 Computing
Roland Hagan, IBM Vice President for IBM System x server platform, presented on how IBM is redefining the x86 computing experience. More than 50 percent of all servers are x86 based. These x86 servers are easy to acquire, enjoy a large application base, and can take advantage of readily available skilled workforce for administration. The problem is that 85 percent of x86 processing power remains idlea, energy costs are 8 times what they were 12 years ago, and management costs are now 70 percent of the IT budget.
IBM has the number one market share for scalable x86 servers. Roland covered the newly announced eX5 architecture that has been deployed in both rack-optimized models as well as IBM BladeCenter blade servers. These can offer 2x the memory capacity as competitive offerings, which is important for today's server virtualization, database and analytics workloads. This includes 40 and 80 DIMM models of blades, and 64 to 96 DIMM models of rack-optimized systems. IBM also announced eXFlash, internal Solid State Drives accessible at bus speeds.
The results can be significant. For example, just two IBM System x3850 4-socket, 8-core systems can replace 50 (yes, FIFTY) HP DL585 4-socket, 4-core Opteron rack servers, reducing costs 80 percent with a 3-month ROI payback period. Compared to IBM's previous X4 architecture, the eX5 provides 3.5 times better SAP performance, 3.8 times faster server virtualization performance, and 2.8 times faster database performance.
The CIO of Acxiom provided the customer testimonial. They were able to get a 35-to-1 consolidation switching over to IBM x86 servers, resulting in huge savings.
Top ROI projects to Get Started
Mark Shearer, IBM Vice President of Growth Solutions, and formerly my fourth-line manager as the Vice President of Marketing and Communications, presented a list of projects to help clients get started. There are over 500 client references that have successfully implement Smarter Planet projects. Mark's list were grouped into five categories:
Enabling Massive Scale
Increase Business Agility
Manage Risk, Compliance and Security
Organize Vast Amounts of Information
Turn Information into Insight
The attendees were all offered a free "Infrastructure Study" to evaluate their current data center environments. A team of IBM experts will come on-site, gather data, interview key personnel and make recommendations. Alternatively, these can be done at one of IBM's many briefing centers, such as the IBM Executive Briefing Center in Tucson Arizona that I work at.
This wraps up the week for me. I have to pack the XIV back into the crate, and drive back to Tucson. IBM plans to host another Executive Summit in the September/October time frame on the East coast.
Here I am, day 11 of a 17-day business trip, on my last leg of the trip this week, in Kuala Lumpur in Malaysia. I have been flooded with requests to give my take on EMC's latest re-interpretation of storage virtualization, VPLEX.
I'll leave it to my fellow IBM master inventor Barry Whyte to cover the detailed technical side-by-side comparison. Instead, I will focus on the business side of things, using Simon Sinek's Why-How-What sequence. Here is a [TED video] from Garr Reynold's post
[The importance of starting from Why].
Let's start with the problem we are trying to solve.
Problem: migration from old gear to new gear, old technology to new technology, from one vendor to another vendor, is disruptive, time-consuming and painful.
Given that IT storage is typically replaced every 3-5 years, then pretty much every company with an internal IT department has this problem, the exception being those companies that don't last that long, and those that use public cloud solutions. IT storage can be expensive, so companies would like their new purchases to be fully utilized on day 1, and be completely empty on day 1500 when the lease expires. I have spoken to clients who have spent 6-9 months planning for the replacement or removal of a storage array.
A solution to make the data migration non-disruptive would benefit the clients (make it easier for their IT staff to keep their data center modern and current) as well as the vendors (reduce the obstacle of selling and deploying new features and functions). Storage virtualization can be employed to help solve this problem. I define virtualization as "technology that makes one set of resources look and feel like a different set of resources, preferably with more desirable characteristics.". By making different storage resources, old and new, look and feel like a single type of resource, migration can be performed without disrupting applications.
Before VPLEX, here is a breakdown of each solution:
Non-disruptive tech refresh, and a unified platform to provide management and functionality across heterogeneous storage.
Non-disruptive tech refresh, and a unified platform to provide management and functionality between internal tier-1 HDS storage, and external tier-2 heterogeneous storage.
Non-disruptive tech refresh, with unified multi-pathing driver that allows host attachment of heterogeneous storage.
New in-band storage virtualization device
Add in-band storage virtualization to existing storage array
New out-of-band storage virtualization device with new "smart" SAN switches
SAN Volume Controller
HDS USP-V and USP-VM
For IBM, the motivation was clear: Protect customers existing investment in older storage arrays and introduce new IBM storage with a solution that allows both to be managed with a single set of interfaces and provide a common set of functionality, improving capacity utilization and availability. IBM SAN Volume Controller eliminated vendor lock-in, providing clients choice in multi-pathing driver, and allowing any-to-any migration and copy services. For example, IBM SVC can be used to help migrate data from an old HDS USP-V to a new HDS USP-V.
With EMC, however, the motivation appeared to protect software revenues from their PowerPath multi-pathing driver, TimeFinder and SRDF copy services. Back in 2005, when EMC Invista was first announced, these three software represented 60 percent of EMC's bottom-line profit. (Ok, I made that last part up, but you get my point! EMC charges a lot for these.)
Back in 2006, fellow blogger Chuck Hollis (EMC) suggested that SVC was just a [bump in the wire] which could not possibly improve performance of existing disk arrays. IBM showed clients that putting cache(SVC) in front of other cache(back end devices) does indeed improve performance, in the same way that multi-core processors successfully use L1/L2/L3 cache. Now, EMC is claiming their cache-based VPLEX improves performance of back-end disk. My how EMC's story has changed!
So now, EMC announces VPLEX, which sports a blend of SVC-like and Invista-like characteristics. Based on blogs, tweets and publicly available materials I found on EMC's website, I have been able to determine the following comparison table. (Of course, VPLEX is not yet generally available, so what is eventually delivered may differ.)
Scalable, 1 to 4 node-pairs
One size fits all, single pair of CPCs
SVC-like, 1 to 4 director-pairs
Works with any SAN switches or directors
Required special "smart" switches (vendor lock-in)
SVC-like, works with any SAN switches or directors
Broad selection of IBM Subsystem Device Driver (SDD) offered at no additional charge, as well as OS-native drivers Windows MPIO, AIX MPIO, Solaris MPxIO, HP-UX PV-Links, VMware MPP, Linux DM-MP, and comercial third-party driver Symantec DMP.
Limited selection, with focus on priced PowerPath driver
Invista-like, PowerPath and Windows MPIO
Read cache, and choice of fast-write or write-through cache, offering the ability to improve performance.
No cache, Split-Path architecture cracked open Fibre Channel packets in flight, delayed every IO by 20 nanoseconds, and redirected modified packets to the appropriate physical device.
SVC-like, Read and write-through cache, offering the ability to improve performance.
Space-Efficient Point-in-Time copies
SVC FlashCopy supports up to 256 space-efficient targets, copies of copies, read-only or writeable, and incremental persistent pairs.
Like Invista, No
Remote distance mirror
Choice of SVC Metro Mirror (synchronous up to 300km) and Global Mirror (asynchronous), or use the functionality of the back-end storage arrays
No native support, use functionality of back-end storage arrays, or purchase separate product called EMC RecoverPoint to cover this lack of functionality
Limited synchronous remote-distance mirror within VPLEX (up to 100km only), no native asynchronous support, use functionality of back-end storage arrays
Provides thin provisioning to devices that don't offer this natively
Like Invista, No
SVC Split-Cluster allows concurrent read/write access of data to be accessed from hosts at two different locations several miles apart
I don't think so
PLEX-Metro, similar in concept but implemented differently
Non-disruptive tech refresh
Can upgrade or replace storage arrays, SAN switches, and even the SVC nodes software AND hardware themselves, non-disruptively
Tech refresh for storage arrays, but not for Invista CPCs
Tech refresh of back end devices, and upgrade of VPLEX software, non-disruptively. Not clear if VPLEX engines themselves can be upgraded non-disruptively like the SVC.
Heterogeneous Storage Support
Broad support of over 140 different storage models from all major vendors, including all CLARiiON, Symmetrix and VMAX from EMC, and storage from many smaller startups you may not have heard of
Invista-like. VPLEX claims to support a variety of arrays from a variety of vendors, but as far as I can find, only DS8000 supported from the list of IBM devices. Fellow blogger Barry Burke (EMC) suggests [putting SVC between VPLEX and third party storage devices] to get the heterogeneous coverage most companies demand.
Back-end storage requirement
Must define quorum disks on any IBM or non-IBM back end storage array. SVC can run entirely on non-IBM storage arrays
HP SVSP-like, requires at least one EMC storage array to hold metadata
SVC 2145-CF8 model supports up to four solid-state drives (SSD) per node that can treated as managed disk to store end-user data
Invista-like. VPLEX has an internal 30GB SSD, but this is used only for operating system and logs, not for end-user data.
In-band virtualization solutions from IBM and HDS dominate the market. Being able to migrate data from old devices to new ones non-disruptively turned out to be only the [tip of the iceberg] of benefits from storage virtualization. In today's highly virtualized server environment, being able to non-disruptively migrate data comes in handy all the time. SVC is one of the best storage solutions for VMware, Hyper-V, XEN and PowerVM environments. EMC watched and learned in the shadows, taking notes of what people like about the SVC, and decided to follow IBM's time-tested leadership to provide a similar offering.
EMC re-invented the wheel, and it is round. On a scale from Invista (zero) to SVC (ten), I give EMC's new VPLEX a six.