Unsolved
This post is more than 5 years old
2 Intern
•
137 Posts
0
980
Changing RAID Level on RAID Group 0 (Vault)
I have a query about the Vault drives / RAID Group 0
I have a customer with a VNX5300 with NL-SAS drives in the DPE. It came from the factory that way. Recently they upgraded the VNX with extra DAEs and a mixture of SAS and NL-SAS disks. Now they have Pools configured using all available disks.
They are now using Mirrorview/S with another VNX5300, and bi-directional replication. As all other disks are used in pools, the only option for the Write Intent Log is RAID Group 0 on the first 4 disks (Vault).
At present RAID Group 0 is configured as RAID-6 , but there are no LUNs defined in this group, and the disks show up as "Unbound" under Storage Hardware -> Disks. I really don't want to put the WIL on NL-SAS RAID-6, as I think that would be the worst option. Can I delete RAID Group 0 and re-create it with RAID1/0 ? If this were a normal RAID Group I would have no questions about it, but since they are the vault disks, I want to be sure. I would assume that user actions like deleting a RAID Group would have no effect on the vault, can you guys confirm this please?
Thanks in advance,
Stephen
sylvain-20x4-
35 Posts
0
February 16th, 2015 02:00
Hi Stephen,
You can delete RG 0 and recreate a new one with RAID type 1/0.
Private luns on vault drives are not affected by this operation.
Regards,
dynamox
1 Rookie
1 Rookie
•
20.4K Posts
0
February 16th, 2015 03:00
i would not place WIL on vault drives.
SteveK821
2 Intern
2 Intern
•
137 Posts
0
February 16th, 2015 04:00
Hi dynamox,
I know that best practices say WIL should not be placed on vault drives, but I don't have any disks available to make a classic RAID group. All other disks are used in pools.
Even the Knowledge Book for MirrorView states this:
"Write intent log LUNs must reside on RAID-group-based LUNs. If all eligible disks in a storage system are deployed in pools, then the write intent log LUNs may be placed on the system drives."
Thanks and regards,
Stephen
dynamox
1 Rookie
1 Rookie
•
20.4K Posts
0
February 16th, 2015 13:00
you should not put high i/o LUNs on vault drives. I don't know how many MirrorView pairs you are going to configure and how much write activity on the source ..keep that in the back of your mind.
kelleg
4.5K Posts
0
February 17th, 2015 12:00
Was your question answered correctly? If so, please remember to mark your question Answered when you get the correct answer and award points to the person providing the answer. This helps others searching for a similar issue.
glen