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5 drives (Disks 0-4 of Bus0/Encl0) make up vault storage. When I run a Raid Group Layout report, I see disks 0-3 as constituting RaidGroup-1 and disk 4 as "Free Disk". Shouldn't disk 4 be a part of the raid group or designated as a hot spare for RaidGroup-1?
239
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Posted March 16th, 2010 10:00
There are hidden partitions on the vault drives that do not appear in any managment or reporting interface. So for the enduser those disks are blank, but the array maintains the hidden partitions on those drives.
239
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Posted March 16th, 2010 10:00
The RAID Groups that you see in the RAID Group layout report are the "user-space" RAID Groups and not the vault drive RAID groups. Vault Drive information and layout is not user visible and not reported in these reports.
239
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Posted March 16th, 2010 10:00
So, disk 4 isn't really blank. It also contains hidden vault information?
nandas
6 Operator
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1473 Posts
239
0
Posted March 16th, 2010 10:00
Vault drives are the initial 5 drives, which has a small portion of each drive reserved and hidden for Flare Use. You can not see the Vault configuration or information.
For this reason, the useable space on these drives are lesser than any other non-vault drives.
Now the RAID Group layout that you are referring to is user-configuration - you can create any RAID group configuration on these drives - but typically one single RAID Group is created on the Vault drives in order to keep them separate from mixing with non-vault drives and utilizing the same size disks.
However, it is recommended that you do not put any high I/O stuff on the RAID Groups/LUNs created with Vault drives. Many users keep the vault drive unused, unless absolutely needed.
My 2 cents
Thanks,
Sandip