Using -f seems to have worked just running e2fsck now When running a command like mdadm --assemble -- force --verbose /dev/md0 /dev/sa[abcde] how important it the drive order? Sent from my iPad > On 2 Dec 2013, at 05:51 am, NeilBrown <neilb@xxxxxxx> wrote: > > 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 one of the disk is reporting "possibly out of date" is there any way 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 > -- 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
