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Currently I have 2 equallogic arrays, a PS5000( 4TB )and PS6000( 8TB ) in a group and am using RAID 10. So this gives me a usable space of about 4.5TB, when you account for the online spares. I am considering converting from RAID 10 to RAID 50 which would effectivly double my capacity. Does this procedure take a long time? Are there any caveats to this process? From the manuals it looks pretty straight forward and the risk of data loss is quite minimal. Any info or links to docs would be great. Thanks.
J
mfkelly_tx
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Posted December 15th, 2010 08:00
I recently performed a RAID 10 to RAID 50 conversion on a PS6510 that took about 8 hours or so with probably around 5TB of data on it at the time. The speed will definitely depend on how much data you have. We experienced no problems or outages during the conversion.
It may benefit your setup to install SANHQ and monitor your current array for a week or more (if you can (disk space wise)). Some of the numbers you want to look at are IOPS and read/write ratio. If you're doing a relatively high write ratio, it's probably better to leverage that capability that mfkelly_tx talked about and have 1 member as raid 10 and the other as raid 50 and let the array figure out which volume is best off on which raid type (this does require both members to be in the same pool and I'd highly recommend them to be the same drive type (SATA, 10k SAS or 15k SAS) as the automatic raid selection cannot distinguish between drive types, just between raid types (last I heard).
mfkelly_tx
31 Posts
1428
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Posted December 15th, 2010 08:00
I have three in that pool I mentioned above, I have 2 in another pool. There can be different RAID sets within the same pool, in fact I have them purposly that way so that "automatic raid" performance load balancing can function. I had 2 RAID10 and 1 RAID 50, then converted one more to RAID 50 with no problems.