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July 30th, 2010 12:00
Celerra pool management
Guys,
We are upgrading our Celerra NS480 with 56Tb raw capacity using 2Tb SATA disks. We are currently using AVM. If we let AVM create the pools, then this huge amount of capacity will go into the clarata_archive pool automatically. I have a few questions:
a ) Will there be a performance issue if we have a single pool of this size?
b ) Is it recomended to create two or more ATA pools manually instead of a single huge one?. If yes, what would be the recommended size and what are the benefits if any of having multiple ATA pools?.
c) Is there a recommended maximum size of a pool?
d) What raid type is recommended to create out of this raw storage at the Clariion backend?
Thanks a bunch.
ral67_xyz
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August 2nd, 2010 06:00
Hi,
dont worry about a Celerra pool being too big
in terms of performance it cant be too big - only too small :-)
reason being that a pool isnt a "physical object" like a raidgroup or an aggregate
a (system) pool is merely a list of volumes with the similar protection and performance characteristics
from that pool the Celerra selects a couple of dvols (nr. depends on the pool - max for for Clariion), stripes them together for performance and slices/concats them for capacity
if the pool is large enough then AVM has a decent chance to find some balanced dvols to stripe together
I would use more pools (user defined pools) only when I need to seggregate performance or capacity between different applications or departments
If you go that route you need to make sure the user defined pool also uses striping (by default it doesnt)
in terms of LUN size I would go with whatever the Storage Provisioning Wizard creates
there is no max pool size - it would be good if a pool had at least four independent dvols (not on the same raidgroup)
raid type and size is really up to your preferences and how many disks you have
all the supported configs are fine - I tend to go with 4+1R5 or 8+1R5 or 6+2R6
Rainer
dynamox
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July 30th, 2010 12:00
i believe NS480 does not support LUNs > 2TB. In regards to raid you have a few decisions to make, you could got with large RAID6 configuration or smaller RAID5 configuration. Right now i don't have any 2TB drives, 1TB only so i have been doing 6+1 raid 5 groups. If i ever go with 2TB drives, i might go a little more conservative and do raid 6 just because of how big and slow those drives are and rebuild times would be so much longer so the chances of double drive failure are much higher.
Take a look at this link
http://corpusweb130.corp.emc.com/ns/common/post_install/Configure_storage_Non_FC.pdf
dynamox
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July 30th, 2010 12:00
i have a 225 terabyte sata pool, this is not a performance configuration, simple file shares and some NFS shares for vSphere. AVM has been doing a good job for us and it is so simple to use it.
white221g
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July 30th, 2010 12:00
Dynamox,
Thanks for the reply. What size luns should be created ideally and added to the NAS storage group in the Clariion backend?. Is raid 5 (4+1) good enough?
Thanks.
dynamox
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July 30th, 2010 13:00
take a look at this storage provisioning wizard video as well
https://community.emc.com/docs/DOC-7385