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Tony Pearson is a Master Inventor and Senior Software Engineer 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. You can also follow him on Twitter @az990tony.
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The proof-of-concept that IBM Haifa research center developed back in 1998 became what we now call the iSCSI protocol.The book iSCSI: The Universal Storage Connection introduces the history as follows:
In the fall of 1999 IBM and Cisco met to discuss the possibility of combining their SCSI-over-TCP/IP efforts. After Cisco saw IBM's demonstration of SCSI over TCP/IP, the two companies agreed to develop a proposal that would be taken to the IETF for standardization.
There are three ways to introduce iSCSI into your data center:
Through a gateway, like the IBM System Storage N series gateway, that allows iSCSI-based servers connect to FC-based storage devices
Through a SAN switch or director, a FC-based server can access iSCSI-based storage, an iSCSI-based server accessing FC-based storage, or even iSCSI-based servers attaching to iSCSI-based storage.
Directly through the storage controller.
IBM has been delivering the first method with its successful IBM System Storage N series gateway products, buttoday we have announced additional support for the second and third methods.Here's a quick recap.
New SAN director blades
Supporting the second method, IBM TotalStorage SAN256B Director is enhanced to deliver iSCSI functionality with a new M48 iSCSI Blade, which includes 16 ports (8 Fibre Channel ports; and 8 Ethernet ports for iSCSI connectivity). We also announced a new Fibre Channel M48 Blade which provides 10 Gbps Fibre Channel Inter Switch Link (ISL) connectivity between SAN256B Directors.
With support for Boot-over-iSCSI, diskless rack-optimized and blade servers can boot Windows or Linux over Ethernet,eliminating the management hassles with internal disk.
All of this is part of IBM's overall push into the Small and Medium size Business marketplace, making it easier to shop for and buy from IBM and its many IBM Business Partners, easier to deploy and install storage, and easier tomanage the storage once you have it.
I have arrived safely in Las Vegas for the IBM System Storage and Storage Networking Symposium. This eventis held once every year. The gold sponsors were: Brocade, Cisco, Finisar, Servergraph, and VMware. Our silversponsor was Qlogic.
I presented IBM's System Storage strategy and an overview of our product line. For those who missed it,our strategy is focused on helping customers in four key areas:
Optimize IT - to simplify and automate your IT operations and optimize performance and functionality, through server/storage synergies, storage virtualization, and intergrated storage infrastructure management.
Leverage Information - to enable a single view of trusted business information through data sharing, and to get the most value from information through Information Lifecycle Management (ILM).
Mitigate Risk - to comply with security and regulatory requirements, and keep your business running with a complete set of business continuity solutions. IBM offers a range of non-erasable, non-rewriteable storage, encryption on disk and tape, and support for IT Infrastructure Library (ITIL) service management disciplines.
Enable Business Flexibility - to provide scalable solutions and protect your IT investment through the use of open industry standards like Storage Networking Industry Association (SNIA) Storage Management Initiative Specification (SMI-S). IBM offers scalability in three dimensions: Scale-up, Scale-out, and Scale-within.
IBM has a broad storage portfolio, in seven offering categories:
Disk Systems, including our SAN Volume Controller, DS family, and N series.
Tape Systems, including tape drives, libraries and virtualization.
Storage Networking, a complete set of switches, directors and routes
Infrastructure Management, featuring the IBM TotalStorage Productivity Center software
Business Continuity, advanced copy services and the software to manage them
Lifecycle and Retention, our non-erasable, non-rewriteable storage including DR550, N series with SnapLock, and WORM tape support, Grid Archive Manager and our Grid Medical Archive Solution (GMAS)
Storage Services, everything from consulting, design and deployment to outsourcing and hosting.
I could talk all day on this, but given that the room was packed, every seat taken and the rest of the audience standing along the walls, I had to keep it down to one hour.
SAN Volume Controller Overview
I presented an overview of the IBM System Storage SAN Volume Controller (SVC), IBM's flagship disk virtualizationproduct. Rather than giving a long laundry list of features and benefits,I focused on the five that matter most:
Reduces the cost and complexity of managing storage, especially for mixed storage environments
Simplifies Business Continuity through non-disruptive data migration and advanced copy services
Improves storage utilization, getting more value from the storage hardware you already have
Enhances personnel productivity, empowering storage administrators to get their job done
Delivers high availability and performance
SAN Volume Controller - Customer Success Stories
A good part of this conference are presented by non-IBMers, which include Business Partners and clientssharing their experiences. In this session, we had two speakers share their experiences with SVC.
David Snyder keeps over 80 web sites online and available. His digital media technologiesteam uses SVC to make their storage administration easier, and ensure high availability for web site content creation and publishing.
Mark Prybylski manages storage at his company, a financial bank. His storage management team uses SVC Global Mirror which provides asynchronous disk mirroring between different types of disk, as part oftheir Business Continuity/Disaster Recovery plan.
The last session I attended was "Storage .. to Optimize your ECM depoloyments" by Jerry Bower, now working for IBM as part of our recent acquisition of the Filenet company. ECM stands for Enterprise Content Management, and IBM is the market leader in this space. Jerry gave a great overview of IBM Content Manager software suite, our newly acquired Filenet portfolio, and the storage supported.
After the sessions was a reception at the Solution Center with dozens of exhibitor booths. For example,Optica Technologies had their PRIZM productswhich are able to connect FICON servers to ESCON storage devices.
Last week, a writer for a magazine contacted us at IBM to confirm a quote that writing a Terabyte (TB) on disk saves 50,000 trees. I explained that this was cited from UC Berkeley's famousHow Much Information? 2003 study.
To be fair, the USA Today article explains that AT&T also offers "summary billing" as well as "on-line billing", but apparently neither of these are the default choice. I can understand that phone companies send out bills on paper because not everyone who has a phone has internet access, but in the case of its iPhone customers, internet access is in the palm of your hands! Since all iPhone customers have internet access, and AT&T knows which customers are using an iPhone, it would make sense for either on-line billing or summary billing to be the default choice, and let only those that hate trees explicitly request the full billing option.
Sending a box of 300 pages of printed paper is expensive, both for the sender and the recipient. This informationcould have been shipped less expensively on computer media, a single floppy diskette or CDrom for example. Forthose who prefer getting this level of detail, a searchable digitized version might be more useful to the consumer.
Which brings me to the concept of Information Lifecycle Management (ILM). You can read my recent posts on ILM byclicking the Lifecycle tab on the right panel, or my now infamous post from last year about ILM for my iPod.
His recollection of the history and evolution of ILM fairly matches mine:
The phrase "Information Lifecycle Management" was originally coined by StorageTek in early 1990s as a way to sell its tape systems into mainframe environments. Automated tape libraries eliminated most if not all of the concerns that disk-only vendors tout as the problem with manual tape. I began my IBM career in a product now called DFSMShsm which specifically moved data from disk to tape when it no longer needed the service level of disk. IBM had been delivering ILM offerings since the 1970s, so while StorageTek can't claim inventing the concept, we give them credit for giving it a catchy phrase.
EMC then started using the phrase four years ago in its marketing to sell its disk systems, including slower less-expensive SATA disk. The ILM concept helped EMC provide context for the many acquisitions of smaller companies that filled gaps in the EMC portfolio. Question: Why did EMC acquire company X? Answer: To be more like IBM and broaden its ILM solution portfolio.
Information Lifecycle Management is comprised of the policies, processes,practices, and tools used to align the business value of information with the mostappropriate and cost effective IT infrastructure from the time information isconceived through its final disposition. Information is aligned with businessrequirements through management policies and service levels associated withapplications, metadata, and data.
Whitepapers and other materials you might read from IBM, EMC, Sun/StorageTek, HP and others will all pretty much tell you what ILM is, consistent with this SNIA definition, why it is good for most companies, and how it is not just about buying disk and tape hardware. Software, services, and some discipline are needed to complete the implementation.
While the SNIA definition provides a vendor-independent platform to start the conversation, it can be intimidatingto some, and is difficult to memorize word for word.When I am briefing clients, especially high-level executives, they often ask for ILM to be explained in simpler terms. My simplified version is:
Information starts its life captured or entered as an "asset" ...
This asset can sometimes provide competitive advantage, or is just something needed for daily operations. Digital assets vary in business value in much the same way that other physical assets for a company might. Some assets might be declared a "necessary evil" like laptops, but are tracked to the n'th degree to ensure they are not lost, stolen or taken out of the building. Other assetsare declared "strategically important" but are readily discarded, or at least allowed to walk out the door each evening.
... then transitions into becoming just an "expense" ...
After 30-60 days, many of the pieces of information are kept around for a variety of reasons. However, if it isn'tneeded for daily operations, you might save some money moving it to less expensive storage media, throughless expensive SAN or LAN network gear, via less expensive host application servers. If you don't need instantaccess, then perhaps the 30 seconds or so to fetch it from much-less-expensive tape in an automated tape librarycould be a reasonable business trade-off.
... and ends up as a "liability".
Keeping data around too long can be a problem. In some cases, incriminating, and in other cases, just having toomuch data clogs up your datacenter arteries. If not handled properly within privacy guidelines, data potentially exposes sensitive personal or financial information of your employees and clients. Most regulations require certain data to be kept, in a manner protected against unexpected loss, unethical tampering, and unauthorized access, for a specific amount of time, after which it can be destroyed, deleted or shredded.
So ILM is not just a good idea to save a company money, it can keep them out of the court room, as well as help save the environment and not kill so many trees. Now that 100 percent of iPhone customers have internet access, and a goodnumber of non-iPhone customers have internet access at home, work, school or public library, it makes sense for companies to ask people to "opt-in" to getting their statements on paper, rather than forcing them to "opt-out".
The IBM Storage and Storage Networking Symposium in Las Vegas continues ...
N series and VMware
Jeff Barnett presented how VMware manages disk image files in its VMfs repository, and how N series offersa better alternative. Virtual machines can access N series volumes directly.
Business Continuity with System i
Allison Pate presented the various Business Continuity options for System i. Many customersuse internal storage for System i, but this then hampers Business Continuity efforts. Instead,you can have IBM System Storage DS8000 or DS6000 series disk systems provide disk mirroringbetween clustered systems.
There was a lot of interest in DR550, one of our many compliance storage solutions. Ron Henkhauspresented an overview of our DR550 and DR550 Express offerings. Unlike the competitive disk-onlysolutions, such as the EMC Centera, the DR550 allows you to attach an automated tape library, managing large amounts of fixed content data at a much lower cost point. It also has encryption, for both diskand tape data.
Open Systems Disk Management
Siebo Friesenborg presented the various steps needed to troubleshoot performance problemswith open systems, including the use of "iostat" on AIX systems as an example, and the stepsyou can take to make formal Service Level Agreements (SLA) between the IT department and thevarious lines of business.
IBM Encryption - TS1120 and LTO-4 encryption comparison
Tony Abete presented TS1120 and LTO-4 encryption techniques. Deploying encryption is more thanjust choosing a tape drive. There are a variety of factors involved, such as whether to managethe keys from the application, the operating system, or the library manager. You need policiesto decided when to encrypt tapes and when not to, generating your keys, storing them, and sharingthem with your business partners, suppliers and service providers with which you send tapes.
I can tell that many people are feeling like they are "drinking from a firehose".IBM's success in storage reaches out to so many different aspects of information management,a variety of industries, and disciplines as varied as regulatory compliance and medical imaging.
I can't believe I have been blogging for a year now!
I have Jennifer Jones from IBM to thank for getting this started. She was my predecessor in the job I have now, and she was moving on to bigger and better things, and during the transition for me to take over, she suggested that we start a blog, podcast, or similar. While there are many blogs and podcasts inside the firewall of IBM, I wanted something to be accessible to all of our IBM sales team, IBM Business Partners, existing and prospective clients, and to enable comments, to enable two-waycommunication. Podcasts are very one-way, so we chose a blog instead.Getting it set up took a while, convincing our own management that this was worthwhile, and dealing with our legal department on the IBM blogging guidelines of what we can and cannot write about, we finally got it going last year, launching September 1, just in time for our 50 years of disk systems innovation campaign.
It has been a wild ride, a great learning experience, and has proven quite fulfilling for job satisfaction. Here are some observations and lessons I have learned along the way.
Roller is the open source blog server that drives Sun Microsystem's blogs.sun.com employee blogging site, IBM DeveloperWorks blogs that this blog exists on, thousands of internal blogs at IBM Blog Central, the JRoller Java community site, and hundreds of others world-wide.Whereas there might be fancier blog systems elsewhere that I could have chosen, hosting my blog with IBM Developerworksseemed like a good choice. I can access from any web-browser capable machine, and enter my blog posts in nativeHTML, that I develop in the tool itself, or offline with a standard basic text editor like Microsoft Notepad that I can then cut-and-paste back in.
One lesson I learned the hard way was that Roller generates the Permalink URL for each blog post based on the first five words of the title. For that reason, it is important to chose an appropriate and unique title, avoiding the use of punctuation, quotation marks, or pharmaceutical "enhancement products" that might get rejected by SPAM filters.Once chosen, you can't change the title afterwards as it won't match the Permalink anymore.My blog post "Aperi is (enhancement product) for SMI-S" caused no end of grief to our Press Release team.
Writing blog posts in native HTML is not as hard as it sounds. I am limited to hosting a maximum of 24MB of files, and they can only be jpg, jpeg, gif, png, mp3, pdf or ppt format.So, wherever possible, I point to other websites for content.For those new to blogging, I recommendThe Barebones Guide to HTML.
Roller also generates for me a spreadsheet of all my page views for the week. Tracking blog traffic closely is as crazyas checking your company's stock price every day. These "web-stat" e-mails get filed directly into my Bacn folder on Lotus Notes.
In my earlyadvice to bloggers, I mentioned my choice of Bloglines as my RSS feed reader. When I subscribe to a new blog, I specify Full entries, not Partial,which allows me to scan it quickly, but filters out many of the non-text content like videos. It also allowed meto see what my own blog posts looked like from within a reader, so that I can write them appropriately.
I find if valuable to read other blogs, including those written by employees of our toughest competitors. Evenif you don't blog yourself, following blogs can be extremely valuable. Be careful what you leave as comments onother blogs, they may come back to haunt you later.
Currently, I track 55 blogs, some about storage,marketing, Web 2.0 issues, Second Life, Linux, or other areas of interest. I prefer blogs that make only 1-5 postsper week, so blogs like LifeHacker and LifeRemix are off my Bloglines list, but are excellent resourceswhen I am searching for something specific. If you think 55 is a lot of blogs, consider Timothy Ferriss' post onHow RobertScoble reads 622 RSS feeds each morning.
I have quite an international readership, so I have to be careful using American idioms and pop cultural references.For example, in my blog post IBM acquires Softek, I mentioned "shotgun weddings" and had various responses asking what exactly did that mean,all from readers outside the USA. I've learned that sometimes you need to link them to an American Slang dictionary,or Wikipedia encyclopedia entry to explain these terms and phrases.
Technoraticurrently tracks over 100 million blogs and over 250 million pieces of tagged social media. Getting my blogtracked had some issues. You have to join, thenpost a "claim"on your own blog. My mistake was having a case-sensitive URL with a mix of upper and lower case letters, but Technorati prefers all lower case. IBM worked with Technorati to get this resolved.
Del.icio.us is a social bookmarking website -- the primary use is to store your bookmarks online, which allows you to access the same bookmarks from any computer and add bookmarks from anywhere, too. On del.icio.us, you can use tags to organize and remember your bookmarks, which is a much more flexible system than folders.
I use Firefox, Safari, Dillo and Internet Explorer web browsers, so it is nice that I have access to allmy bookmarks in the same consistent manner. When I see content on a website that I might like to reference laterin a blog, I tag it with del.icio.us so that I can get to it later.
Fellow GTD-ers will quickly recognize this acronym, but for the rest of you, it refers to David Allen's book "Getting Things Done®".This is a great book! I learned about it reading other people's blogs, and found it incrediblyuseful helping me organize my time.There are various online tools available to help employ this method. I use Lotus Connections Activitiesfor group projects with co-workers at IBM, and BackPack for projects withmy friends outside of work.
The success of YouTube encouraged IBM to launch IBM TV, a portal for IBM's video and multimedia assets and make it easier for IBM employees, customers, partners and prospects to access and view IBM multimedia. The plan is to have eight anchor episodes per year, professionally hosted by TV personality, Joe Washington, and point to related offers and other resources for viewers to learn more.
Blogging also introduced me to Second Life. I asked around if anyone else within IBM was using Second Life, anddiscovered quite a few. I got invited to join our internal Eightbar group, and participated in various events, including an IBM Holidayparty that I discussed in my blog post"Building a Snowman in Second Life".
In April, we had a launch of our newest products in Second Life, and we plan to have two more Second Life events,September 20 and another in November, staged as "Meet the Experts" question and answer panels.
I wrap up with Facebook. Actually, whereas most of my Web 2.0 efforts have been work-related, I have quite a few friends and family who follow my blog. Several were inspired to start their own blogs, such asPassages from Pamand Barry Whyte on Storage Virtualization. Bridging the gap is Facebook, something I can use to keep tabs on my friends, as well as my storage industry-related contacts.
Wow, that's quite a lot in one year. Well, I am done with my meetings down here in Sao Paulo, Brazil. My colleauges and I are returning tonight to enjoy the long Labor Day weekend.
If you are ever down in Sao Paulo, Brazil, may I suggest not drinking "American amounts" of their "Brazilian Coffee". The coffee here is "robust", to say the least.
Yesterday, my blog focused on IBM iSCSI offerings that were announced in August.Also announced earlier this month, the Integrated Removable Media Manager (IRMM) on System zhas been years in the making.IRMM is a new robust systems management product for Linux® on IBM System z™ that manages open system media in heterogeneous distributed environments and virtualizes physical tape libraries. IRMM combines the capacity of multiple heterogeneous libraries into a single reservoir of tape storage that can be managed from a central point.By providing an integrated solution with the opportunity for both mainframe z/OS DFSMSrmm and distributed Tivoli® Storage Manager™ environments to be managed by IRMM, System z can now be a hub for the management of removable media.
The people who thought the "Mainframe is obsolete", and those that thought "Tape is dead", are both proven wrong again with this announcement. People are looking to deploy robust tape automation for backup and archive, and this convergence with mainframe makes perfect sense by providing business value that extends to other distributed systems.
Some people find it surprising that it is often more cost-effective, and power-efficient, to run workloads on mainframe logical partitions (LPARs) than a stack of x86 servers running VMware.
Perhaps they won't be surprised any more. Here is an article in eWeek that explains how IBM isreducing energy costs 80% by consolidating 3,900 rack-optimized servers to 33 IBM System z mainframe servers, running Linux, in its own data centers. Since 1997, IBM has consolidated its 155 strategic worldwide data center locations down to just seven.
I am very pleased that IBM has invested heavily into Linux, with support across servers, storage, software andservices. Linux is allowing IBM to deliver clever, innovative solutions that may not be possible with other operating systems. If you are in storage, you should consider becoming more knowledgeable in Linux.
The older systems won't just end up in a landfill somewhere. Instead, the details are spelled out inthe IBM Press Release:
As part of the effort to protect the environment, IBM Global Asset Recovery Services, the refurbishment and recycling unit of IBM, will process and properly dispose of the 3,900 reclaimed systems. Newer units will be refurbished and resold through IBM's sales force and partner network, while older systems will be harvested for parts or sold for scrap. Prior to disposition, the machines will be scrubbed of all sensitive data. Any unusable e-waste will be properly disposed following environmentally compliant processes perfected over 20 years of leading environmental skill and experience in the area of IT asset disposition.
Whereas other vendors might think that some operational improvements will be enough, such as switching to higher-capacity SATA drives, or virtualizing x86 servers, IBM recognizes that sometimes more fundamental changes are required to effect real changes and real results.
I am back at "the Office" for a single day today. This happens often enough I need a name for it.Air Force pilots that practice landing and take-offs call them "Touch and Go", but I think I needsomething better. If you can think of a better phrase, let me know.
This week, I was in Hartford, CT, Somers, NY and our Corporate Headquarters in Armonk, in a varietyof meetings, some with editors of magazines, others with IBMers I have only spoken to over the phone andfinally got a chance to meet face to face.
I got back to Tucson last night, had meetings this morning in Second Life, then presented "InformationLifecycle Management" in Spanish to a group of customers from Mexico, Chile, and Brazil. We have a great Tucson Executive Briefing Center, and plenty of foreign-language speakers to draw from our localemployees here at the lab site.
Sunday, I leave for Las Vegas for our upcoming IBM Storage and Storage Networking Symposium. We will cover the latest in our disk, tape, storage networking and related software.Do you have your tickets? If you plan to attend, and want to meet up with me, let me know.
Registration is now open for our next "Meet the Storage Experts" event in Second Life. All IBMers, clients and IBM Business Partners are welcome to attend. We will focus this time on DS3000 and N series disk systems, tape systems,and IBM storage networking gear.
Continuing this week in Las Vegas, we had a great set of sessions today.
Fibre Channel Overview
I like the manner in whichJim Robinson presented this "basics" session on how Fibre Channel works, why it is spelled "Fibre" not "Fiber", and how all the different layers work in the protocol.
IBM Virtualization Engine TS7700 series
Jim Fisher from the IBM Tucson lab presented the TS7700 series, which replaces our Virtual Tape Server (VTS). Hehad performance numbers to show that it was faster in various measurements against the B20 model of the VTS. Itis supported on the z/OS, z/VM, z/VSE, TPF and z/TPF operating systems.
IBM E-mail Archiving and Storage solution
Ron Henkhaus provided an overview of IBM's E-mail Archive and Storage appliance. The solution combines IBM BladeCenter server blade, DS4200 serieswith SATA disk, and pre-installed software: IBM Content Manager, IBM Records Manager, IBM CommonStore for Lotus Domino and Microsoft Exchange, and IBM System Storage Archive Manager. Services are included to get it connected toyour e-mail environment.
Lee La Frese from our Tucson performance lab presented various performance featuresof the IBM System Storage DS8000 series, and how they compare to competition.
First, some interesting statistics.
Back in 2002, the average high-end EnterpriseStorage Server (ESS) model F20 was configured only for 4 Terabytes (TB). In 2004,the average ESS was up to 12 TB. Today, the average DS8100 is 17.4 TB and the averageDS8300 is 41.5 TB.
51 percent of DS8000 series are configured for FCP only (Linux, UNIX, Windows, i5/OS),35 percent FICON only (System z mainframe), and 14% have both mixed.
Average I/O density has stabilized to about 0.6 IOPS per GB. This means that for everyTB of business data, you can expect most applications to issue 600 Input/Output requestsper second.
While IBM SAN Volume Controller has the fastest SPC-1 and SPC-2 benchmarks, the DS8000also has good results. Looking at just the monolithic "scale-up" systems, DS8000 hasthe fastest SPC-1, and second place for SPC-2.
Compared against the EMC DMX-3, the IBM DS8000 series has superior performance.For example, comparing 2Gbps port performance on each, DMX-3 is able to do 20 IOPS perport, compared to DS8000 with 38 IOPS per port.Compared against HDS USP, the response time for 60,000 IOPS for HDS averaged 10.5 milliseconds (msec), compared to IBM DS8000 less than 6.5 msec.
There are some unique features of the DS8000 to optimize performance. Two areAdaptive Multi-stream Prefetching (AMP) which helps improve processing of databasequeries, and HyperPAV which helps on mainframe workloads.
For FATA disks, performance of sequential reads and writes is only 20 percent less than15K RPM FC disks, but a whopping 50 percent less for random access. Consider using FATAfor audio/video streaming, surveillance data, seismic recordings, and medical imaging.
Comparing 146GB 10K versus 300GB 15K from a capacity perspective was interesting.37TB of 300GB 15K had 20 percent better response time, but 25 percent less maximum throughput,than 37TB of 146GB drives. Depending on your workload, this can help decided which youchoose.
Lee also covered RAID rebuild performance. When an individual HDD fails that is part of a RAIDgroup, the DS8000 performs a rebuild onto a spare drive. A RAID-5 rebuild is processedat 52 MB/sec, compared to RAID-10 at 56 MB/sec. Rebuild processing is low priority,so any other workload will take higher priority to avoid impacting application performance.Compared to EMC, the IBM DS8000 can rebuild RAID-5 73GB 15K RPM drive in only 24 minutes, but it takes 37 minutes to do this on a DMX-3. That is 13 minutes of additional exposure where a second drive failure might cause you to lose all your data in that RAID group!
N series ILM and Business Continuity
James Goodwin from our Advanced Technical Support team presented IBM System Storage N series featuresthat relate to ILM and Business Continuity. He covered features like SnapShot, SnapLock,SnapVault and LockVault.