Sorry to bring up a old thread, last night i had a power cut and this morning when the power has come back i have tried to boot the server, but the raid will not assemble on using a live CD i have found that one of the disk is reporting "possibly out of date" is there any way to force this disk back in? the bigger problem i have is that my external caddie has died so i was running a degraded raid 6 but now it is only starting with 4 out of 6 devices. is there anyway to get this back? i have though about recreating the array using the --assume-clean option but not sure if that's a good idea any help will be much appreciated On 24 October 2011 21:47, Michael Busby <michael.a.busby@xxxxxxxxx> wrote: > > I was sure i added the device before, but when rebooted the system it > has seemed to lose the extra drive and i had already restarted the > grow command with out checking the disk was there, so more than likely > a mistake by me > > > > On 24 October 2011 21:39, NeilBrown <neilb@xxxxxxx> wrote: > > On Mon, 24 Oct 2011 21:19:22 +0100 Michael Busby <michael.a.busby@xxxxxxxxx> > > wrote: > > > >> Ok thanks, i have 1 small issue, when added the extra disk its been > >> maked as spare, is this normal? > >> > >> Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] > >> [raid4] [raid10] > >> md0 : active raid6 sde[0] sdg[6](S) sda[4] sdb[3] sdd[2] sdc[1] > >> 7814055936 blocks super 1.0 level 6, 512k chunk, algorithm 18 > >> [6/5] [UUUUU_] > >> [>....................] reshape = 3.0% (59244544/1953513984) > >> finish=11122.8min speed=2837K/sec > >> > > > > It looks like the extra drive was added after you started the grow. > > > > So it is still a spare. > > Once the grow finishes you will have a singly-degraded RAID6. > > Then it will immediately start recovering the missing device to the spare. > > > > Did you add the extra drive after starting the grow - or before?? > > > > NeilBrown > > > > > > > > > >> > >> > >> > >> On 24 October 2011 21:14, NeilBrown <neilb@xxxxxxx> wrote: > >> > On Mon, 24 Oct 2011 17:03:46 +0100 Michael Busby <michael.a.busby@xxxxxxxxx> > >> > wrote: > >> > > >> >> should the speed be very slow when doing this progress, its a lot > >> >> slower than a normal grow > >> > > >> > Yes. > >> > The array is being reshaped in-place. i.e. data is being read from part of > >> > the array, rearranged, and written back to the same part of the array. > >> > As you can imagine, this is risky - a crash will leave an inconsistent state. > >> > Hence the backup file. Everything in the array is first written to the > >> > backup file, then back to the array. So it is slow. > >> > > >> > A "normal" grow is writing to somewhere where there is no valid data, so it > >> > doesn't need the backup. > >> > > >> > I do have a plan to make this faster.... but I have lots of plans and little > >> > time. > >> > > >> > NeilBrown > >> > > >> > > >> > > >> > > >> >> > >> >> reshape = 1.2% (25006080/1953513984) finish=12481.8min speed=2574K/sec > >> >> > >> >> On 24 October 2011 15:11, Mathias Burén <mathias.buren@xxxxxxxxx> wrote: > >> >> > On 24 October 2011 14:11, Michael Busby <michael.a.busby@xxxxxxxxx> wrote: > >> >> >> At the moment i have a raid5 setup with 5 disks, i am looking to add a > >> >> >> 6th disk and change from raid 5 to raid 6 > >> >> >> > >> >> >> having looked at Neil's site i have found the following command, and > >> >> >> just want to double check this is still the recommend way of > >> >> >> converting > >> >> >> > >> >> >> mdadm --grow /dev/md0 --level=6 --raid-disks=6 --backup-file=/home/md.backup > >> >> >> > >> >> >> also would i need to add the extra disk before or after the command? > >> >> >> > >> >> >> cheers > >> >> >> -- > >> >> >> 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 > >> >> >> > >> >> > > >> >> > Hi, > >> >> > > >> >> > I grew my 6 disk RAID5 to a 7 disk RAID6. First, add the drive. Then > >> >> > partition it as required. Then add the drive to the array (I think > >> >> > it'll become a spare?). Then you can grow it. > >> >> > > >> >> > Make sure you're using the latest mdadm tools available. > >> >> > > >> >> > Regards, > >> >> > Mathias > >> >> > > >> >> -- > >> >> 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 > >> > > >> > > > > > -- 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
