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November 09, 2009


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David Barker

Hi Chad, would you mind a request?...

When the army's not busy, would it be possible to re-run the NS120 tests with SSD for the gold images & SATA for the user data? I'm guessing most of the I/O was against the linked clone bases - a little SSD might go a long way :-)

Chad Sakac

Unfortunately, in View 4, you still can't put the base replica and the linked clones on seperate datastores.

This will be solved soon - either via FAST v2 (block level automated tiering) or View 4.1 which will enable that use case.


David was referring to separating the boot LUNs from the user data which could be housed on CIFS shares backed by SATA storage, not separating the linked clones from the replicas (solved by FAST and/or future View releases). Testing of boot LUN deployments on EFD (SSD) drives has been done. As of now we are seeing 4-8x the desktop density per "spindle" and roughly 50% better average disk response times as compared to 15k Fibre drives.

David Barker

Hi Aaron - thanks for the update. If you get a chance, could you forward on any test results you have?

fyi: We have several lab pc's (~1000) all running the same image that we think VDI may be good for. In tests, linked clones of our image cost about 1Gb each, so we are looking at ~1Tb to store everything, requiring ~3000 iops. SSD seems to be a perfect fit.

Brian Gracely

@Aaron (or anyone else on the team),

When you plan to include the details within the paper, similar to what was done on the V-MAX VDI document from a few months ago. When you talk about $750/desk, what does that include (mostly interested in the storage side...is it all EFDs, how many disks were required, etc..).

Also, should we expect that the NS-120 report will be similar to the storage component of Vblock 0?


Hi Dave,

Id suggest looking at NetApp with PAM Cards. Seems an obvious fit here



Chad: What kind of VIC/NIC's/CNAs were used in the VMWare View exercise/Vblock1?

Mark Bowker

An ESG research report from early 2009 indicated that approximately 21% of organizations are using a VDI solution with another 8% planning to do so. Among these early and planned VDI adopters, only 15% plan to deploy the technology to all or most of their employees. The vast majority (82%) of respondents will implement VDI on a much more selective basis, either restricting it to certain employee types now and for the foreseeable future, or implementing it on a limited basis now with expectations of rolling the technology out to a wider audience at a later date.

The reference architectures are great, but how are you helping customers with POCs (proof of concept)?

Chad Sakac

@ Ron - PAM is NetApp's response to the challenge, and it certainly helps. That said, PAMs are in effect a cache, not non-volatile storage, which means they assist with some of the IO density challenge. Not suggesting it's bad - more use of RAM in hosts, in storage as cache, or flash in the form of non-volatile disk - it's all goodness.

Conversely, EMC's approach is SATA coupled with SSD - using View Compooser and other composition techniques. Regardless of the way you go, leverage the learning we're doing with customers around the world to help you!

@stor2 - we were using Palo adapters in the Cisco UCS.

@ Mark - thanks for the comment. We're doing hundreds (thousands?) of PoCs as we speak for customers of every shape and size. The reference archictectures serve as a baseline for customers to start with predictable building block configurations. On the VCE Solutions Support Team (the joint selling/technical teams) we have "hyper specialists" focused on VDI use cases. Those folks get engaged and support customers through their PoC phases.

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