On Tue, Dec 29, 2009 at 1:31 PM, John Robinson <john.robinson@xxxxxxxxxxxxxxxx> wrote: > > On 29/12/2009 12:08, Mikael Abrahamsson wrote: >> >> On Tue, 29 Dec 2009, Jon Hardcastle wrote: >> >>> I run gentoo with kernel 2.6.22-gentoo-r8 >>> >>> to convert my 6 drive +1 spare raid 5 to a 7 drive raid 6? >> >> No, you need at least kernel 2.6.32 to migrate from raid5 to raid6. > > But if you don't want to run 2.6.32 permanently/on your live system, iirc you can just run it to do the migration, and once the migration and reshape have completed, you can go back to your production kernel. > Besides the kernel version issues, this type of migration is definitely possible and should be safe. I just did one of these before christmas - grew a 3 or 4-disk RAID-5 into a 6-disk RAID-6, all on 1.5TB drives. Lots of fun nail-biting moments watching /proc/mdstat! As it turned out, the thing just started, went about its business, and finished in a quiet and refined manner. Now my arrays are vast and comfortably redundant ... Just give yourself a set of big, physical reminders to update your mdadm.conf when the reshape / relevel is done. And you really, preferably ought to back your data up before you do this. Even though the rearrangement will probably work just fine. Merry everything! -- Kristleifur -- 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
