1. Support for Volume Shadow Copy Service (VSS) for filesystems Windows Server 2003 and Windows Server 2008 guests.  This means VMware services like VCB and SRM can now signal Windows Server to quiesce filesystems before creating a clone or snapshot and is a major addition!
2. Windows Server 2003 guests also get application quiescing, where supported.
3. You can now extend a live, running VMFS volume as storage is added, just like Windows Vista and 2008 guests could already do with raw device mode (RDM).  Note that this only works for flat disks with no persistent snapshots open.

A few items are now officially supported, too:

1. Support for Storage VMotion between and among Fibre Channel and iSCSI datastores is here, and in Update 1.
2. iSCSI over 10 gigabit Ethernet (10 GbE) is now supported allegedly, though the I/O Compatibility Guide still says “Gigabit only”.  Of course, it already worked, but it’s nice to have official support just the same…  Bring on the datacenter Ethernet!  They’ll support this in Update 1 too.
3. And NFS over 10 GbE is supported, too!

1. They supposedly added support for 8 gigabit Fibre Channel (8 Gb FC) HBAs, but I don’t see it in the I/O Compatibility Guide. The Emulex LP12000/LP12002 are noted as 4 Gb only, the QLogic QLE2560/QLE2562 aren’t listed, the HP 81/82 series isn’t there either.  Update:  QLogic and Emulex HBAs are supported after all!
2. Support for more Serial-Attached SCSI (SAS), including Dell SAS 5/E, LSI 1078, Sun SG‐XPCIESAS‐R‐EXT‐Z, and HP SC08GE is listed in the Stotage Compatibility Guide.
3. CIM system health monitoring of some QLogic and Emulex HBAs is new too.

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See also:

• Scott Lowe’s (as always) excellent overview
• VM /ETC’s colorful post
• Excellent coverage at Yellow Bricks

© sfoskett for Stephen Foskett, Pack Rat, 2008. | Storage Fixes in VMware ESX Server 3.5 Update 2
This post was categorized as Enterprise storage, Virtual Storage. Each of my categories has its own feed if you'd like to filter out or focus on posts like this.

I guess the razor wire only went one way, eh Storagezilla?  Now if only every other storage management product was VM-savvy…

Update: Looks like EMC announced VMware compatability in ControlCenter 6.0 back in May.  I’d love to learn more about just how well these two products work in the real world.  Anyone using them?

© sfoskett for Stephen Foskett, Pack Rat, 2007. | SRM For VMware (Thank God!)
This post was categorized as Enterprise storage, Virtual Storage. Each of my categories has its own feed if you'd like to filter out or focus on posts like this.

I’ve been in the trenches on storage content (aka data) for a long time. I, too, have often reverted to the old “gigs of MP3s and porn” argument from time to time. But I’ve done enough filesystem assessments at real companies to realize that that’s not really the norm. In fact, I’ve rarely found much porn, music, video, or jokes on full-up corporate file servers. And I’ve analyzed enough storage environments to know that, while file servers are big, they’re not normally the majority user of storage in large data centers.

On the contrary, most enterprise storage is taken up by business applications, though not necessarily critical data. Email, backup, and certainly user file servers are big space users. But give me a few Oracle instances, source code repositories, or image processing servers, and watch those applications shrink in significance.

No matter what the application, though, the real issue with storage growth (and ILM) is the (in)ability of IT managers to do anything about it. Let’s say we had permission to delete really inappropriate data, which is not a sure thing. Would we IT folks even be able to recognize it? How would we locate it? Can we even view user files without violating user trust, company privacy policies, or even laws? Many countries (yes, not all data is in the USA), regulate access to data even inside a company.

Now let’s move into grayer areas of “unnecessary” corporate data. Many storage administrators can’t even name the applications that take up all that space, let alone understand the intricacies of the data under management.  To make a timely (and tired) Harry Potter analogy, IT are the house-elves of the business – powerful but subservient, with little input into what happens above and around them.  I’ve talked to business people who don’t want IT to have any input, relegating them to order takers and laborers.

This is a dangerous slide, however.  Lots of people have the capability to take IT orders and keep the lights on,  a realization that leads to outsourcing.  IT pros must prove their worth to the business in order to remain relevant and irreplaceable!

ILM is one way to do that.  To get back to Chuck’s post, we need to take the reins and try to understand data better.  We need to pick certain applications that lend themselves to automated data classification and tiered storage and try to get them under control.  Email is a great candidate, and that’s why email archiving applications have taken off recently.  File servers are coming along, too, especially with file virtualization in the ascendancy.

I’m particularly excited about what a smart IT manager I know called the “second wave” of SRM tools.  Rather than just collecting stock metadata (age, name, owner, etc), the latest filesystem scanning tools look inside a file, trying to better classify them.  Let’s say 1/4 of your file server is made up of Microsoft Word, Excel, and PowerPoint documents.  What can you do about that unless you can identify which are critical and which are not?  Each business will have its own criteria, and you need a flexible tool to scan them all and report back to you before you can “ILM” them.  That’s what lots of software vendors are currently working on, and though we’re at an early stage still, the results are promising.

Sadly, though, we in IT may soon find that we just can’t delete anything.  Even totally banned content like porn could be critical to a legal case against an employee,  and it won’t be long before we are expected to keep everything that shows up on our servers for a very long time.  Most companies have policies for hardcopy document retention, and many are currenyly diving into the world of data policy as well.  The default policy may be “keep until we decide what to do with it”, and this could cause the current trend of storage growth to accelerate!

If we can’t delete data, we will be forced to sail the Titanic rather than sink it.  Small companies can benefit most from the falling price of storage, since the entire storage footprint for a little shop is often under a terabyte.  But larger organizations will find that they need to start tiering their storage, and quickly in order to keep prices under control.

And then there’s green storage.   Again, Mr. Toigo makes the very valid point that the problem is in the business, not in the hardware we use.  But if we can’t do anything about data growth for the time being, we had better start tackling the technical challenges we face.  I’ve talked to many IT folks who are very worried about data center space, as well as the terrifying trio of heat, power, and cooling.  For them, green technologies are no laughing matter!  If you can’t get any more power, you have to lower your per-GB requirement and quickly.

It’s easy to say “understand your data and delete some”, but hard for IT pros to  actually do it.  Until we can tackle the strategic issue of data growth, we’ll have to continue fighting the tactical problems of storage.

© sfoskett for Stephen Foskett, Pack Rat, 2007. | Sailing the Titanic (Why We Need ILM and Then Some!)
This post was categorized as Enterprise storage. Each of my categories has its own feed if you'd like to filter out or focus on posts like this.