On Sat, 30 Nov 2013 22:13:58 +0000 Michael Busby <michael.a.busby@xxxxxxxxx> wrote: > 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 one of the disk is reporting "possibly out of date" is there any way 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? It's really hard to know what is possible without precise details. Output of "mdadm -E" for each member device is always a good idea. If you are having trouble assembling, then output of the assemble command with -vv added never goes astray. Have you tried adding "-f" to the assemble command. Often helps and is unlikely to hurt. > > i have though about recreating the array using the --assume-clean > option but not sure if that's a good idea Not a good idea except as a very last resort. NeilBrown > > 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 > > >> > > > >> > > > > > > >
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