Solved!
Go to SolutionThanks Don, however, with the space requirements we have, this has been decided as the solution.
Both members are currently RAID 6 and given Dell's latest best practise advice around the use of >1TB disks for RAID 6 only, I assume there wont be any issue with both members being RAID 6!?
To answer your two questions:
Q: Will the pool merge destroy this reserve or move it over
A: No, all reserve will move with the members/volumes
Q: Does pool 1 need the space to accomodate all the data from pool 2 in order for this to work!?
A: No, merging a larger pool into a smaller one is fine.
-joe
I agree with Don regarding you could not see the full benefit of APLB in this instance. One of the main reasons (as Don indicted) is that most of the volume slices will reside on the larger SATA array, so the faster array could be underutilized, and lower you’re Return on Investment.
For example: if the two members have the same workload and both have high, but similar, latency then APLB will not attempt to optimize arrays, so there is no page movement that would improve performance.
However, you stated that you need the space, so your options are a bit limited at this time (aside from purchasing an additional array).
A possible work-a-round is to move just a few of your volumes from one pool to another, to free up your space needs. For instance, if you need more space in the hybrid pool, move underutilized volumes or volumes that don’t need the performance of the SAS disks, to the SATA Pool.
-joe
I understand this, guys! Thankyou for your answers! Although it's not entirely my decision to make! To confirm, no volumes are deleted as a result of the merge!? Sorry to ask so many questions, just can't afford to overlook anything. I'm upgrading the firmware just before the pool merge!
Eric9_0bf226
6 Posts
684
0
Posted November 4th, 2015 19:00
Hi, am merging my existing storage pool into the new one, however the existing one and new one are in different raid level, may i know what's behavior if joining storage pool with different raid level?
Pool 1 is running out of space (currently is R6 and unable to convert to R50 as its limitation), and if i need to re-configure the raid, i need to migrate volumes out, however pool 2 not enough space to host all the volumes on pool 1, so may i know whats the impact if pool-1 R6 merging into pool-2 R50?
Currently:
Pool 1: 1 x PS6000-raid 6 with 16x600 15k rpm
Pool 2: 2 x PS6100-raid 50 with 16 x 600 15krpm
Joe S586
9 Technologist
•
729 Posts
917
1
Posted October 18th, 2012 08:00
Yes, you can safely merge pools while the volumes are live. Just a few things to verify first, to ensure you have a trouble free merge:
In the pool that you are merging, you want to check the disk spin rate to ensure that members in the target pool have same RAID level as in the member(s) you are merging. (Dell recommends that pool members with the same disk spin rate have the same RAID level). Example, if a target pool contain a member that has 7200 RPM disks configured for RAID10, and one of the members in the merging pool has a 7200 RPM member configure for RAID50.
Thin clones inherit the pool setting of the template volume. If you move the template volume to a different pool, the thin clones also move.
-joe