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January 11th, 2013 14:00
Two Storage Pools or One?
HI,
I have a 4000XV and a new 4100E. Both are running RAID 6. If both are in the same storage pool will load balancing work properly? We have VMware guests and backup data on them. Both are on 6.0.2.
Thanks,
Ed
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DELL-Joe S
7 Technologist
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729 Posts
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January 14th, 2013 06:00
The Automatic Performance Load Balancer works to make sure the members IO’s or latency levels are approximately the same when the arrays are active or in a steady state of IO, so there would need to be significant differences in latency for APLB to start exchanging pages between members.
Also, since these arrays are of the same RAID policy the 4000XV typically has less capacity then the 4100E so data is striped across both member in the pool, this will be proportion to the relative sizes (i.e., the 4000E will hold more volume slices). This could not be your desired result, and you should examine this closer with SANHQ to see what works best for you (one pool or two).
About the Tiering, this is on the volume level (i.,e, RAID policy preference, pool placement, etc.).
Useful Links:
Tiering: www.equallogic.com/.../DownloadAsset.aspx
Load Balancing: www.equallogic.com/.../DownloadAsset.aspx
SANHQ (how to monitor): www.equallogic.com/.../DownloadAsset.aspx
-joe
Ed.Willson
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January 12th, 2013 20:00
So after a bit of reading - I've got a question about tiered storage. Is it volume based? I mean if all my volumes have similar IOPS will it be a tossup as to which array they end up on?
Ed.Willson
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January 14th, 2013 18:00
Thanks - I was mixing apples and oranges it seems.
Thanks,
Ed