Virtual Server Performance Raid 10 vs 2 Raid 1's (Mirror)

Virtual Server Performance Raid 10 vs 2 Raid 1's (Mirror)

Post by Damo » Sun, 27 Apr 2008 00:19:51


Hi,

Just wondering if anyone knows what would perform better for Virtual Server
Performance.

1 Raid 10 array with the Virtual Servers and OS on the same raid set
(different partitions) or 2 mirrors with the OS on one mirror and the
Virtual Servers on the other.

Cheers

Damon
 
 
 

Virtual Server Performance Raid 10 vs 2 Raid 1's (Mirror)

Post by Charlie Ru » Mon, 28 Apr 2008 00:11:50

There are tradeoffs either way. RAID10 (or 0+1) both have only single
redundancy. Dual mirrors gives you separate redundancies - if either mirror
has a failed disk, you're still redundant on the other mirror. But not on
the one where there was a failure. Speed on the RAID 10 or 0+1 is generally
better overall. OTOH, moving to separate spindles for each set of uses has
advantages too.

--
Charlie.
http://www.yqcomputer.com/
http://www.yqcomputer.com/

 
 
 

Virtual Server Performance Raid 10 vs 2 Raid 1's (Mirror)

Post by WGF2aWV » Mon, 28 Apr 2008 06:28:00

On a Microsoft white paper giving tips on how to improve performances of VS
2005, it specifically says that you are always better off not installing the
Host OS on the same disks/system-disks than the one of the VM OSs.

Seems to make a lot of sense to me, even though I do not have any test data
available comparing both setups available.

Hope this helps,

Xavier
 
 
 

Virtual Server Performance Raid 10 vs 2 Raid 1's (Mirror)

Post by Charlie Ru » Mon, 28 Apr 2008 07:25:08

Yup, that's certainly true, all other things being equal. OTOH, RAID 10 or
0+1 is a whole lot faster than a simple mirror, so I'm not at all sure it
still holds true.

--
Charlie.
http://www.yqcomputer.com/
http://www.yqcomputer.com/