Neil Brown said: (by the date of Fri, 13 Nov 2009 15:37:05 +1100) > > And so my plan is to get some liveCD with 2.6.31 (or maybe 2.6.32 ?). > > Connect the sixth drive, boot liveCD, perform the migration: > > > > mdadm --add /dev/md2 /dev/sdd3 > > mdadm --grow /dev/md2 --level=raid6 --raid-disks=6 > > > > Then reboot back into linux 2.6.24. > > > > Will this work? > > In principle, yes. > However: > 1/ you need linux 2.6.32 (not yet released). Don't try with 2.6.31 > 2/ you need mdadm 3.1.1 (not yet released). Don't try with 3.1, > which has been withdrawn. > 3/ You need a "--backup-file=/some/file" argument. The /some/file > must be on a different device. > > > > > Will 2.6.24 understand such raid6 ? > > Yes. > mdadm will first convert the RAID5 to a RAID6 in which the Q blocks > are all on the last disk. This is done instantly. > Then mdadm will start and manage a process of re-laying out each > stripe to have the Q blocks rotated around the various devices. > This will take a while, approximately 1 day. Once this is complete, > you can then access the array from 2.6.24. > > NeilBrown Great, thanks a lot! I'm not in such a hurry - I will wait until they are released. -- Janek Kozicki | -- 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
