Le 31/01/2013 18:27, Adam Goryachev a écrit :
1) Stop DRBD on secondary
2) Pull all drives on secondary
3) Add all drives on secondary and build new RAID6 array
4) Enable DRBD on secondary
5) sync from primary to secondary
I second that. Rebuilding 16 disks RAID6 is very long.
Danger of read errors on the primary during this sync
Before you start, "drbdadm verify all" will make sure both nodes can
actually read their disks.
Bonus: the resync will make sure the RAID can actually write to the
disks (no bad surprise).
(...)Finally, I think you have a fairly high risk with 16 drives in a single
RAID6
No way. With DRBD it's like RAID6+1 and you still should have backups.
Losing 3 disks on both nodes at the same time means fire, lots of bad
luck, or evil people being bad.
When it eventually happens, a downtime is probably OK - rebuild from
scratch and restore backups.
By the way, moving one node to a building across the street protects
from fire.
Lionel Sausin.
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