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04-22-2009 03:11 AM
04-22-2009 03:11 AM
msa 2312fc
Hi i'm after a bit of advice..
We've just purchased an MSA 2312 fc with 4 enclosures one enclosure filled with 1TB SATA the 3 filled with 450GB SAS
I was wondering about the best way to carve up the SAS drives. The storage is going to be used completely for a test environment connected to 2 stand alone ESX servers.
So far we've decided to divide the 36 SAS drives into 2 large vDisks of raid 50 with 2 sub disk groups in each, each containg 2 lots of 9 disks for the raid 5. I think this will give us decent mix of performance and protection - only downside I can see are rebuild times. Would we be better to create smaller vDisks with smaller disk subsets? As I said as this is just for test environment we don't need to go over the top on performance or protection just need to find a happy medium.
We've just purchased an MSA 2312 fc with 4 enclosures one enclosure filled with 1TB SATA the 3 filled with 450GB SAS
I was wondering about the best way to carve up the SAS drives. The storage is going to be used completely for a test environment connected to 2 stand alone ESX servers.
So far we've decided to divide the 36 SAS drives into 2 large vDisks of raid 50 with 2 sub disk groups in each, each containg 2 lots of 9 disks for the raid 5. I think this will give us decent mix of performance and protection - only downside I can see are rebuild times. Would we be better to create smaller vDisks with smaller disk subsets? As I said as this is just for test environment we don't need to go over the top on performance or protection just need to find a happy medium.
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04-22-2009 07:40 AM
04-22-2009 07:40 AM
Re: msa 2312fc
If you have the time run some i/o tests with the setup you propose and using fewer disks in your vdisks. This array/disk model is rather new and there might not be enough feedback. Every array has its own capability regarding the number of disks in a RAID group that will perform best. The sales people probably told you that the more disks you put in the raid group the merrier. I have found out that this is nothing more than bad sales pitch. As you test out the raid groups, when adding more physical disks in a group you will notice a performance increase when you start with a few disks and then you gradually add more disks. But after a certain number of disks you will see the perfromance leveling off and then as you add more disks, the performance decreases. The optimal number of disk in a raid group varies with each array make/model/disktype and it depends on the number of back-end i/o buses, the array processor power, cache memory, raid type etc.
The opinions expressed above are the personal opinions of the authors, not of Hewlett Packard Enterprise. By using this site, you accept the Terms of Use and Rules of Participation.
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