To utilize all of our disks in our 2 chassis V7000, I've created a RAID5 mdisk using 5 disks in chassis 1 and 4 disks in chassis 2.
My question is: This is clearly "allowed" as I've already created it. But what are IBM's recommendations on this config? Any pitfalls, performance penalties, etc.?
Pinned topic RAID5 mdisk across 2 chassis' in V7000
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Updated on 2012-12-18T03:40:23Z at 2012-12-18T03:40:23Z by SystemAdmin
SystemAdmin 110000D4XK4779 Posts
Re: RAID5 mdisk across 2 chassis' in V70002012-12-18T03:40:23ZThis is the accepted answer. This is the accepted answer.We have a similar set-up. During the deployment of our expansion we went to IBM Storage Professional Services; the best practice for RAID5 was to spread the disks across as many drawers as possible. You get a speed advantage from using the disks spread across multiple drawers.
You do risk a 'larger' outage if an entire enclosure goes down: You lose everything instead of a a few RAID's. But, speed benefits far outweigh the risks of this occurring.
My setup currently looks like this:
The second drawer came much later, and we couldn't get a solution to split the SSD's across both drawers, hence the ARRAY6 imbalance.