UNSOLVED
RaidGroup Extension issue / CX3 10c
Hi,
We have an issue trying to extend our one and only Raid Group.
We have a Raid6 / 8 disks (0-7) / Raid Group that we would like to extend with 2 new disks.
Disk 0-7 are 400 GB / Seagate DG118032576
Disk 8-9 are 450 GB / (looking for the refs)
FLARE version : 03.26.010.5.014
SnapView / NavisphereManager / AccessLogix : Active
The Raid Group has 10 LUNs, all created on the 8 existing disks, Raid6, for a total of ~2To.
We have 3 MetaLuns using the diffrent LUNs.
The new disks are visible in the enclosures 8 & 9.
When we go to Raid-Group properties, last tab (Disks), the Expand button is greyed out.
Reading the documentations I see that prerequisites seems ok :
- We can have a RaidGroup in Raid 6 with more than 8 disks,
- We can extend a RaidGroup in Raid 6
What are we missing ?
By the way :
- We cannot afford buying a third disk right now, (and then create a Raid 5 Group, and expand the MetaLuns)
- We cannot consider building a Raid 1 Group, and expand the MetaLuns, not enough secure.
- We really would like to proceed in the cleanest way : defrag and then expand the Raid Group.
Damned,
Reading this : http://storagenerve.com/2009/07/15/emc-clariion-raid-6-requirements-and-limitations/
- Defragmentation with RAID-6 is currently not supported on Flare Release 26. => is this true ? so bad ...
- You cannot add new drives to an existing RAID-6 LUN, but you can expand the LUN through RAID-6 MetaLUN technology. Example of this will be, if you have a 6D+2P RAID-6 set and would like to add 16 more drives to the same RAID Group, you cannot accomplish it, but if you manage to create either 2 sets of 6D+2P or 1 set of 14D+2P, and then run a MetaLUN concatenate, you will be able to necessarily achieve the same end result. => that sucks
I would really be interested in the Whitepaper if someone has the link ...
joej1_3ddf8c
34 Posts
326
1
Posted April 2nd, 2012 02:00
Raid 6 raid groups cannot be expanded. There should be a primus and white paper floating explaining the same.
Best Regards
Joji John
Hi,
RAID 6 RAID group cannot be expanded as it is a limitation.
you may find the RAID 6 whitepaper from EMC from..
http://www.emc.com/collateral/hardware/white-papers/h2891-clariion-raid-6.pdf
Refer Page 10 for limitation...
Thanks
Madhu
mdemoulin
6 Posts
326
0
Posted April 2nd, 2012 02:00
Corrected info about disks :
Disk 0-7 are 400 GB / Seagate DG118032576 - 005048775 - C001
Disk 8-9 are 450 GB / Seagate DG118032663 - 005048954 - RC05
(Vendor / Clarion Part Number / Clarion TLA Part Number / Revision)