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How to add disks to an existing pool RaidGroup?
Hi,
Recently, as a matter of urgency to handle the capacity pressure we have added 4 disks in to a Pool with in capacity tier (Raid 6 (6+2)). This has added disks to the Pool and created a RG with 2 + 2 disks with RAID 6.
I would like to understand the steps involved to add the remaining 4 disks to the raid group within the pool and rebalance the data within the raid group or pool.
Regards,
Krishna
storagtetalk
53 Posts
1
August 25th, 2015 08:00
You can’t add drives to the pool like that. When you added the 4 drives, it created an internal RAID group in a 2+2 configuration. If you add four more drives to the pool, it will create another RAID group to serve the pool, in a 2+2 configuration.
Your only solution is to get your pool properly balanced recreate the pool from scratch. Basically, backup your data and restore it. Or, given enough spare drives, create a second pool and migrate luns to that pool – non disruptive, but it will require more drives.
IaKK83AaCI12227
29 Posts
0
August 25th, 2015 07:00
Unfortunately, what you would like to do cannot be done in the straightforward manner you seek.
Once a RAID Group has been created with a specific RAID geometry in a storage pool, it cannot be individually expanded...
You would have to destroy and recreate your storage pool, backing up and reloading all existing user data in the process.
Rainer_EMC
8.6K Posts
1
August 25th, 2015 07:00
You cannot add disks to a internal raidgroup of a block pool
You need to add the other 4 disks just like before – it will create new raidgroup
FAST VP should then balance it over time
adhamakady
65 Posts
1
August 26th, 2015 02:00
Hi Krishna,
I hope these help:
https://support.emc.com/kb/90822
https://support.emc.com/kb/174032
kelleg
4.5K Posts
0
August 26th, 2015 08:00
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glen