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RAID per VM?

Occasional Contributor

RAID per VM?

Hi,

 

I know one large RAID is not a great idea (most of the time), but I am concerned I am going too far the other way.

For example I will have 3 SQL servers and 5 terminal servers in a dual host VMWare environment connected to MSA 2040 via SAS 6GB/s.

 

Each SQL would have

RAID1 (OS)

RAID10 (DATA)

RAID1 (LOGS)

 

Each TS would have

RAID1

 

That alone is 14 RAID sets.

 

Is there a RAID set limit per controller? (Couldn't find one)

 

Any recommendations?

 

Thanks!

3 REPLIES
Acclaimed Contributor Acclaimed Contributor

Re: RAID per VM?

With the current systems you will create vdisks across several physical disks (e.g. a RAID10), then volumes within this vdisk. If you want different RAID types, you need different vdisks.
Maybe a big RAID10 is your solution with several volumes (LUNs) for the servers.

Hope this helps!
Regards
Torsten.

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Occasional Contributor

Re: RAID per VM?

[ Edited ]

Torsten. wrote:
With the current systems you will create vdisks across several physical disks (e.g. a RAID10), then volumes within this vdisk. If you want different RAID types, you need different vdisks.
Maybe a big RAID10 is your solution with several volumes (LUNs) for the servers.

Thanks for replying.

 

Isn't contention a possibility with all IOPS on a single RAID? I know storage technology has gotten more efficient, but I thought if one SQL on the RAID10 was chewing up lots of IOPS i would feel it on my other servers? Separate RAID ensures I get exactly the performance I want for each VM without interuption from other VMs. Don't get me wrong, for some VMs where performance is not as critical i am using a One Big RAId 10 (OBR10).

 

Storage isnt my expertise by any means, so if I am missing something please let me know!

 

Thanks,

-B

Highlighted
Acclaimed Contributor Acclaimed Contributor

Re: RAID per VM?

I would configure at least 2 vdisks, because a controller is the owner of a vdisk, with 2 vdisks you utilize both controllers.

I don't know for sure if it makes a difference if you use more vdisks, but I doubt, especially for a RAID10. If you need high performance, I would compare the MSA with the storeserv (3PAR) product line.


Hope this helps!
Regards
Torsten.

__________________________________________________

There are only 10 types of people in the world -
those who understand binary, and those who don't.

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