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Improving Hyper-V Server performance RAM and IO w. 2 new 15k-disks

Posted on 2010-09-03
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Last Modified: 2013-11-14
I have the following Hyper-V setup:
Fijutsu Siemens PRIMERGY RX300 S4
Intel(R) Xeon(R) CPU L5335  @ 2.00GHz
24 GB RAM
2 SAS-RAID-controllers holding 10 disks:
One holds 2 RAID 1-arrays (this is where the 2 new disks is to be attached)
Second holds a RAID1 and a 4 disk RAID 5 for VHDs containing data only/no OS or Swap-files

Host:
Hyper-V (w. GUI -> might become a core one day)
6 VM's:
1  WS 2008 RTM running Exchange 2007 (4 GB RAM)
5 x WS 2008 R2
Administration-server w. SCWMM, SQL 2008 R2 SMTP (3 GB RAM)
Terminal Server among other things running Outlook 2010 (3 GB RAM)
Print Server (Core 512 MB RAM)
DC (w. GUI 1GB RAM)
Sharepoint 2010 Server (8 GB RAM)

I seek to optimize the Hyper-V server disk, ram and partioningwise.
Two new 15k-disks must be used in the most optimal way.

My initial idea is to place only swap-files on that new 2-disk-RAID - Is that a good idea?

Suppose that is a good idea:
Is it save to create a  RAID0 partition (production) out of that two disks (RAID1 is safe but leaves less space and writes slower)?
Which swapfiles are most wise to move 1) Hyper-V OS Pagefile or 2) Page-files of all the VM's that I  would then create a virtual disk for, change Page-file location to that new disk and restart

Thank you for reading this long post - I cross my fingers for someone w. experience on the area sharing the knowledge.
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Question by:jmateknik
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Expert Comment

by:andyalder
ID: 33594817
I'd add them to the 4 disk RAID 5 and convert it to RAID 10.
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by:jmateknik
ID: 33594888
Thanks for your reply.
I failed to mention that the new disks are the only 15-disks (the rest are10k disks)

I agree with you in that I was the one saying "Not RAID 5 - go for RAID1 or RAID 10!" but it was decided to go the RAID5 route at that time (bear in mind also that all partitions on that RAID 5 holds data only).
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andyalder earned 500 total points
ID: 33610516
Well, presuming you can't add more RAM you might put all the page files (real and virtual) on one disk and the transaction logs for SQL and exchange on the other. It'll die of course if either of these disks goes down but shouldn't suffer any data loss.
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Author Comment

by:jmateknik
ID: 33610759
In general - what precautions should i take to meet the missing redundancy from choosing RAID 0 or the Non-RAID solution you suggest?

I.e. Suppose I did what you suggest, what would happen if SQL Server running in full recovery mode,  was prevented from writing to the failed disk holding the transaction logs?
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Author Closing Comment

by:jmateknik
ID: 33932738
I got the some advice though missing though I would have loved to get an answer on the last part.
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