On 03/30/2011 03:14 PM, David Brown wrote:
On 30/03/2011 11:46, Vincent Schut wrote:
Hi all,
one of my raid's is currently a raid5 with 4 1TB drives, which I'm going
to upgrade by replacing all drives with 2TB drives.
Main question: what is recommended:
- offline the raid, dd(rescue) each 1TB drive onto a new 2TB one,
replace drives, put raid online again
or:
- manually replace one drive at a time, and let the raid recover and
thus write the data onto the new drive?
As far as I know all current drives are healthy; regularly SMART
monitoring and raid checks have not ringed any bells sofar.
I guess offlining and dd-ing would be more secure, but I might miss
something and would like to hear other considerations from people more
experienced in this area.
Regards,
Vincent Schut.
If you've got a spare drive slot, and plenty of time, there is another
option that lets you keep online and redundant during the process.
Re-shape the array to raid 6, while adding one of the new drives. Then
you can replace each drive, one at a time, letting the raid recover in
between. For the last drive, you just have to remove it then reshape
back to raid 5 (although ideally you could buy an extra drive and keep
the raid 6 layout - it's worth the cost, assuming you have the drive slot).
Once everything is swapped over, you grow the array to fit the new disks.
Good thinking. I've asked for budget for one other drive and think I'll
go the raid6 way.
Thanks for all the advice, everyone.
Vincent.
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