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Quintin Smith

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Types of servers on SAN

Hi Experts

We run a microsoft hyperv 2012 environement.

We have the following storage volumes setup
- Volume1 (Raid 5) running on an IBM  V3700 SAN
- Volume2 (Raid 5) running on an IBM  V3700 SAN Expansion
- Volume3 (Raid 10) running on an IBM  V3700 SAN Expansion2 (Not currently in use due to RAID10 testing)

Volumes 1 and 2 are setup as one cluster on which we run all our virtual machines off.

We run the following 2012 virtual servers on SAN cluster1 which consits of SAN volume1 and volume2:
File server , Exchange server, DC, various application servers and 2x SQL servers

I'd like to know from the experts if is best practice to group certains servers togerther per volume to ensure we gian maximum performance from the SAN and virtual machines.

Thanks
Avatar of Carlos Ijalba
Carlos Ijalba
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Usually what you do when you have different types of storage, is move production machines to the fastest possible storage, and development machines to the slowest, so you do group storage by disk performance.

This is called storage tiering, for example you can have tier 1 Fast on Flash disk, tier 2 Normal in RAID-5 and tier 3 Slow on NL-SAS, for example.

On your particular case you can have tier 1 FAST on RAID 10 and tier 2 NORMAL on the RAID-5.
Avatar of Quintin Smith
Quintin Smith

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Hi. Thanks for your reply

Our disks are all the same.  We have 300gb (15k) SAS drives cross the SAN and the two expansion units.

Currently we have prod and dev servers mixed to even out the free space across volume 1 and volume 2

Since we don't have space as a luxury to split production and Dev servers, what would best best practice in a mixed environment to best combat performance / disk I/O issues?

In other words:
Is it best practice in our case where the disks and hosts are all the same speed to run SQL, Exchange and the file server on the same volumes?
Would there be any performance improvement if let's say the Exchange server is moved to it's own volume (2) ?

Thanks
Regards
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Carlos Ijalba
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