How could I expand the volumes and RAID groups to RAID5(6+1)?

25 pts.
Tags:
EMC Celerra
RAID
RAID 5
SAN
Storage Area Network
The case is the celerra is captive, that means no navisphere. We have two RAID Groups (4+1) and one Hot Spare. How could I expand the volumes and RAID groups to RAID5(6+1)

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One solution: You would need to migrate all the data off of the RAID group, destroy it, then create a new RAID group with the new number of disks.

Another solution for Dell Server: add drive to RAID 5 array with Dell OMSA. The process is very easy without shutting down your Server and losing data.

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  • Mohamed1983
    Thank you very much mrdenny, Destroying an existing RAID Group is out of the question , the spage is used for IP-Replications across the world via internet lines, and restarting will take almost a Year!!! In using FC disks, there is a difference between Raid-5 4+1 and Raid-5 8+1, for each there is a different policy: clar_r5_performance for the 4+1 and clar_r5_economy for the 8+1. However, for the S-ATA disks there a same policy “clarata_archive” which is for 4+1 and also for 6+1. If we will expand (manually via navisphere or via navicli) the S-ATA raid group from 4+1 to 6+1 and then rescan (server_devconfig) the CLARiiON – what will be the result? On the source side, the customer has FC Raid Groups and S-ATA Raid Group(Raid-5 6+1 of 500GB S-ATA disks). Also he has 7 free slots. So we thought of adding 7 S-ATA 500Gb Disks and creating a new Raid Group (Raid-5 6+1). In this situation, he can use the existing Spare Disk also for the new added disks. On the destination site, he has one Enclosure with 11 S-ATA 1000GB Disks divided into two Raid-5 4+1 Raid Groups. There are only 4 free slots (without adding another enclosure). So We thought of adding 4 S-ATA 1000Gb Disks and expanding the existing Raid Group. In this situation, he can use the existing Spare Disk also for the new added disks. In our calculation, adding the 7 500GB disks at the source side will give approx. 2.7 TB and the 4 1000GB disks on the destination side approx. 3.5TB. If, as I mentioned above, the policy is the same for 4+1 and 6+1, what prevent us of applying the plan?
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