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Help with XenDesktop sizing

Posted on 2015-02-24
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Last Modified: 2015-04-16
Hello,

I am working on deploying 500 XenDesktops on vSphere.
I have collected the data metrics on users and came up with 3 different use cases:
1) 100 users use 2 monitors   and need 2 vCPUs and 4 GB RAM
2) 100 users user AutoCad and will need 4 vCPUs and 8 GB RAM
3) 300 users are task workers that only need 1 vCPU and 2 GB RAM.

- What I need help with is how do I size the different groups? Have different sized servers for each group on different clusters? same cluster?
- How do I figure out how many VMs per core? vCPUs per physical CPU?
 I wanted to go with a 2 CPU with 12 cores server with 256 RAM but not sure if this will be correct sizing

Finally this is phase 1 with phase 2 we will be adding another 2000 users. I was planning on using MCS. Should we look into PVS instead?

Thank you for your detailed answers in advance.

MC
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Question by:onlinerack
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amichaell earned 500 total points
ID: 40630368
-You are leaving out one very important metric: IOPS.  Determining the required IOPS from your disk is just as important as RAM and CPU.  That also brings to light the MCS vs. PVS debate.  I prefer PVS for several reasons with one of the most important being that PVS can virtually eliminate IOPS.  When using MCS you are reading and writing everything to disk.  With PVS your reads come from the network rather than disk and if you place the write cache in RAM then you are basically eliminating writing to disk as well.

-Another point to consider with MCS is that you really need storage capable of thin provisioning, such as NFS.  If you don't have that, then all of your difference disks will equal the same size as your master image requiring a great deal more disk space.
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