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тАО05-27-2010 08:53 AM - last edited on тАО04-08-2014 06:38 PM by Lisa198503
тАО05-27-2010 08:53 AM - last edited on тАО04-08-2014 06:38 PM by Lisa198503
8 disks in a disk group
Best practices says you should have a multiple of 8 disks in your disk group. What is the performance impact if your disk group does not have a multiple of 8 disks in the group? Say 10? We've got an eva 6400 with 300 gb drives.
P.S. This thread has been moved from Disk to Storage Area Networks (SAN) (Enterprise). -HP Forum Moderator
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тАО05-27-2010 01:48 PM
тАО05-27-2010 01:48 PM
Re: 8 disks in a disk group
This best practice is more for protection of data since the controllers try to groups disks in multiples of 8 for creation of Redundant Storage Sets.
I think that any number of disks more than 8 would still give you more total i/o thus increasing performance... negating much of any effect that not having a multiple of 8 disks would have on the array.
Steven
HP Master ASE, Storage, Servers, and Clustering
MCSE (NT 4.0, W2K, W2K3)
VCP (ESX2, Vi3, vSphere4, vSphere5, vSphere 6.x)
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тАО05-27-2010 11:25 PM
тАО05-27-2010 11:25 PM
Re: 8 disks in a disk group
For more performance , add as many disks as you want in a disk group.
Multiple of 8 is for redundancy inside the group. If you can, spread your groups throughout the shelves you have in multiple of 8 disks
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тАО05-28-2010 12:09 AM
тАО05-28-2010 12:09 AM
Re: 8 disks in a disk group
How to assign points on this new forum? Click the Kudos Star!
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тАО05-28-2010 12:40 AM
тАО05-28-2010 12:40 AM
Re: 8 disks in a disk group
That said, you would most likely have a very slight performance increase by having 10 disks instead of 8 since there would be more spindles in just one RSS. This applies up to and including 11 disks, since that is the max size of an RSS. If you had 12 disks the EVA would form two RSS groups of 6 disks each.
As Greybeard quite rightly states, its best though to have multiples of 8 drives in your diskgroup(s) and also to have 8 drive shelves, that way you build what is referred to as a robust EVA which can theoretically handle one full drive shelf failure.
Neil.