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18330
April 19th, 2009 06:00
Merging Storage Pools
We just added our Dell EqualLogic PS5500e 48TB array into our current infrastructure. We already had an Dell EqualLogic PS400 6.5TB array that was quickly running out of space. I configured the new PS5500e with a RAID 50 configuration which gave me 36.5TB to work with in the pool. Now I have two storage pools. The default 6.5TB pool and the new 36.5TB pool.
My question is should I leave as is or merge the two together for one storage pool? Could I run into any particular problems by doing it this way? If I leave the pools separate can I use storage vmotion between the two?
My question is should I leave as is or merge the two together for one storage pool? Could I run into any particular problems by doing it this way? If I leave the pools separate can I use storage vmotion between the two?
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BobSegurson
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April 22nd, 2009 10:00
Because of the large capacity of the PS5500 it was designed to be its own storage pool, and cannot be combined at this time with other array enclosures in a single larger storage pool.
Both arrays can, however, be managed by the same group manager without being in the same pool.
The PS5000e, a smaller 16 drive array, can be combined with prior EqualLogic products into a single pool.
You should not have any particular problems with the separate pools, and the recommendation would be to reallocate some of your Virtual Machine Storage to the PS5500. This process is called Storage Migration, which copies the VM storage to another datastore, in this case from your PS400e to the PS5500.
The main criteria are the ESX server needs to be able to access both source and target storage devices, and the target has sufficient space available. The process will not start unless these conditions are both met.
VMware has a demonstration of this type of process at
http://download3.vmware.com/vdcos/demos/Storage_VMotion_800x600.html
You will have to verify your currently installed version of VMware operates in the same manner as this demo.
The storage migration process may take some time, so it is recommended you plan for a maintenance window or a time with minimal workload on the affected VM.
shanefontenot
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April 22nd, 2009 11:00