So, if one died, your remaining one would have the space to run everything you need anyway.
If you're rolling your own storage server using comodity parts I'd probably opt for a minimum of 4 SSDs in a Raid-10 array. I'd give a guess at a IOPs utilisation of 1,000 -2,000 for that many desktops asuming all users logged in and doing things. Boot-up IOPs would be much higher (probably around 10,000 - 15,000) but can be managed by booting up desktops over a period of an hour at the start of the day/peak time.
http://jimmoyle.com/wordpress/wp-con...p_Dive_1_0.pdf is a good read for some W7 specific information. Estimate IOPS for Virtual Desktops » ocb - Citrix Community and Deploying XenDesktop without a SAN » ocb - Citrix Community are also some good documents/blogs to read on deploy XenDesktop and IOP requirement planning. The last link is focused on deploying XenDesktop without a SAN and just what you'd need to do that.
One other option is to use XenServers intellicache feature with XenDesktop. See XenDesktop 5 with IntelliCache cuts VDI storage costs in half » ocb - Citrix Community for more infomation. Wouldn't necessarily need SSDs then - either for the SAN or for the local disks.
localzuk (7th June 2011)
Ah, I've just read about it and it does local caching of blocks from the 'master' image - it can do it to RAM, SSD or hard disk. It isn't suited to 'personal' images though, as the write-cache which is created on the local host is wiped on shutdown, rather than being copied back etc...
And again, it assumes we end up with a SAN. Which we don't have and don't want to splash out and buy.
Hi there, Tal Klein from Citrix here. I'm chiming in because I think in your particular XenDesktop VDI situation you'd probably reap the benefits of XenServer IntelliCache. There's a pretty decent article about it from Brian Madden. The reason I say that is because in your case with going pure VDI for less than 200 desktops, you might want to use MCS (Quick Deploy) instead of PVS (Provisioning Services). With MCS+IntelliCache you'd get similar benefits to PVS with less infrastructure. Also, to guide you on storage, the XenServer storage HCL list is here.
I'll try to stay active on this forum because I see a lot of interesting discussion, but if you ever need technical help re: XD feel free to send me a DM. I may marketing in my title, but I come from a long engineering background - my job is mostly to keep marketing (both ours and our competitors) honest
Got it. Well, we also have an HCL for storage controllersr for your server - so any of these with local storage would also support IntelliCache thereby enabling you to use Quick Deploy instead of PVS with "different but similar" benefits to IOPS.
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