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San Config for SQL 2005

Posted on 2009-05-13
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Last Modified: 2013-11-14
I'm planning my SQL 2005 intallation on VM ESX server.  I have 8 san disks to work with and wanted to know what's the best san configuration for the data and log files.  I will be installing 2 separate SQL servers on different vms.  What I had in mind was create a Raid 10 over 4 disks and create 2 volumes to present as data storage to each SQL install.  Then create either a Raid 1 for the logs.  Please advise.
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Question by:nelson97
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7 Comments
 
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Expert Comment

by:chuckyh
ID: 24378995
raid 10 for data and raid 1 for logs is a good way to go.
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Expert Comment

by:St3veMax
ID: 24379489
RAID1+0 for data is overkill. You're unlikely to notice the difference from RAID5.

Transaction Logs I'd go with RAID1+0.

In Summary:

DATA = RAID5
LOGS = RAID1+0
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andyalder earned 500 total points
ID: 24380299
If you create a single RAID 10 volume on four disks and then slice it in half the heads will have to continually seek between the two halves, but that's pretty standatd for SANs anyway though.

I'd go with RAID 10 for data and RAID 1 for logs. Why two seperate small SQL servers rather than one big one?
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Author Comment

by:nelson97
ID: 24388173
Thanks all for the reply.

Andyalder:

I have 4 applications that need SQL dbs and trying to figure out what the best san config would be for deploying this.  Instead of creating a single vm and installing 4 intances of SQL, that I would create 2 vms and install 2 instances of SQL on each vm.  
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by:St3veMax
ID: 24388435
Why do you even need two instances? Could you not put them all on one instance?
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by:andyalder
ID: 24389064
I can't see a reason to have more than one instance, you do that for MS (or any other) active/active cluster of course but by the sound of it both SQL VMs are likely to end up running on the same host anyway.
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Expert Comment

by:stol12
ID: 24915349
What version of vmware are you running, Vsphere will increase I/O performance greatly and this will have great impact on databases. Unless you have high demands for I/O I think RAID 5 for data and RAID 1 for logs is the best soultion for you. You can even have the two instances on the same storage in vmware, no need to split the LUN, it will only make things more complicated.
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