On Wed, 14 Apr 2010 19:22:48 -0700 Michael Evans <mjevans1983@xxxxxxxxx> wrote: > On Wed, Apr 14, 2010 at 6:04 PM, Neil Brown <neilb@xxxxxxx> wrote: > > What is happening here is that the spare (sdh) is getting the Q blocks > > written to it. When this completes you will have full 2-disk redundancy but > > the layout will not be optimal and the array wont be any bigger. > > To fix this you would: > > > > mdadm --grow --backup-file=/root/backup.md4 --raid-devices=6 \ > > --layout=normalise /dev/md4 > > > > Is there some way of telling if the layout is proper, or is that what > 'level 6' indicates? mdadm -D should list the layout. If it ends "-6" then it is a non-standard layout with Q on the last device and the remainder of the devices laid out like a RAID5. > > Also is it safe to run something like... > > mdadm --grow --back-file=/some/never/used/file --layout=normalize /dev/mdX > > on any raid 5/6 device that isn't undergoing an active reshape? (would > it be a null-op if not required) Yes. It quite literally looks at the layout name to see if it ends with "-6". If it is not needed it will actually report and error: mdadm: layout normalize not understood for raid6. I should probably fix that..... one day. NeilBrown -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
