How could I expand the volumes and RAID groups to RAID5(6+1)?
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)
Software/Hardware used:
Software/Hardware used:
ASKED:
May 17, 2010 9:34 AM
UPDATED:
November 7, 2011 3:42 AM
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Answer Wiki:
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: <a href="http://www.partition-magic.org/hardware-raid/add-disk-to-raid-5.html">add drive to RAID 5 array</a> with Dell OMSA. The process is very easy without shutting down your Server and losing data.
<a href="http://www.partition-magic.org/hardware-raid/add-disk-to-raid-5.html">http://www.partition-magic.org/hardware-raid/add-disk-to-raid-5.html</a>
To see all answers submitted to the Answer Wiki: View Answer History.
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?