sending again as it failed to deliver the first time for an unknown reason From: r_o_l_a_n_d@xxxxxxxxxxx To: robin@xxxxxxxxxxxxxxx CC: linux-raid@xxxxxxxxxxxxxxx Subject: RE: can i recover an all spare raid10 array ? Date: Tue, 28 Oct 2014 19:29:25 +0200 Thanks for pitching in. here are the responses to you questions: - yes i expected both of them to be part of the array though one of them was just added to the array and didnt finish recovering when raid1 "/" crashed - i have not removed their superblocks or at least not in a way that i amaware of - mdadm: 3.2.5-5ubuntu4.1 - uname -a: 3.13.0-24-generic PS: I just followed this recovery page: https://raid.wiki.kernel.org/index.php/Recovering_a_failed_software_RAID I managed to reach the last step, whenever i tried to mount it kept asking me for the right file system > Date: Tue, 28 Oct 2014 17:01:11 +0000 > From: robin@xxxxxxxxxxxxxxx > To: r_o_l_a_n_d@xxxxxxxxxxx > CC: linux-raid@xxxxxxxxxxxxxxx > Subject: Re: can i recover an all spare raid10 array ? > > On Tue Oct 28, 2014 at 06:22:11PM +0200, Roland RoLaNd wrote: > >> I have two raid arrays on my system: >> raid1: /dev/sdd1 /dev/sdh1 >> raid10: /dev/sde1 /dev/sda1 /dev/sdf1 /dec/sdb1 /dev/sdc1 /dev/sdg1 >> >> >> two disks had bad sectors: sdd and sdf <<-- they both got hot swapped. >> i added sdf back to raid10 and recovery took place but adding sdd1 to >> raid1 proved to be troublesome >> as i didn't have anything important on '/' i formatted and installed >> ubuntu 14 on raid1 >> >> now system is up on raid 1, but raid10 (md127) is inactive >> >> cat /proc/mdstat >> >> Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] >> md127 : inactive sde1[2](S) sdg1[8](S) sdc1[6](S) sdb1[5](S) sdf1[4](S) sda1[3](S) >> 17580804096 blocks super 1.2 >> >> md2 : active raid1 sdh4[0] sdd4[1] >> 2921839424 blocks super 1.2 [2/2] [UU] >> [==>..................] resync = 10.4% (304322368/2921839424) finish=672.5min speed=64861K/sec >> >> md1 : active raid1 sdh3[0] sdd3[1] >> 7996352 blocks super 1.2 [2/2] [UU] >> >> md0 : active raid1 sdh2[0] sdd2[1] >> 292544 blocks super 1.2 [2/2] [UU] >> >> unused devices: <none> >> if i try to assemble md127 >> >> >> mdadm --assemble /dev/md127 /dev/sde1 /dev/sda1 /dev/sdf1 /dev/sdb1 /dev/sdc1 /dev/sdg1 >> mdadm: /dev/sde1 is busy - skipping >> mdadm: /dev/sda1 is busy - skipping >> mdadm: /dev/sdf1 is busy - skipping >> mdadm: /dev/sdb1 is busy - skipping >> mdadm: /dev/sdc1 is busy - skipping >> mdadm: /dev/sdg1 is busy - skipping >> >> >> if i try to add one of the disks: mdadm --add /dev/md127 /dev/sdj1 >> mdadm: cannot get array info for /dev/md127 >> >> if i try: >> >> mdadm --stop /dev/md127 >> mdadm: stopped /dev/md127 >> >> then running: mdadm --assemble /dev/md127 /dev/sde1 /dev/sda1 /dev/sdf1 /dev/sdb1 /dev/sdc1 /dev/sdg1 >> >> returns: >> >> assembled from 5 drives and 1 rebuilding - not enough to start the array >> >> what does it mean ? is my data lost ? >> >> if i examine one of the md127 raid 10 array disks it shows this: >> >> mdadm --examine /dev/sde1 >> /dev/sde1: >> Magic : a92b4efc >> Version : 1.2 >> Feature Map : 0x0 >> Array UUID : ab90d4c8:41a55e14:635025cc:28f0ee76 >> Name : ubuntu:data (local to host ubuntu) >> Creation Time : Sat May 10 21:54:56 2014 >> Raid Level : raid10 >> Raid Devices : 8 >> >> Avail Dev Size : 5860268032 (2794.39 GiB 3000.46 GB) >> Array Size : 11720534016 (11177.57 GiB 12001.83 GB) >> Used Dev Size : 5860267008 (2794.39 GiB 3000.46 GB) >> Data Offset : 262144 sectors >> Super Offset : 8 sectors >> State : clean >> Device UUID : a2a5db61:bd79f0ae:99d97f17:21c4a619 >> >> Update Time : Tue Oct 28 10:07:18 2014 >> Checksum : 409deeb4 - correct >> Events : 8655 >> >> Layout : near=2 >> Chunk Size : 512K >> >> Device Role : Active device 2 >> Array State : AAAAAAAA ('A' == active, '.' == missing) >> >> Used Dev Size : 5860267008 (2794.39 GiB 3000.46 GB) <<--- does this mean i still have my data ? >> >> >> the remaining two disks: >> >> mdadm --examine /dev/sdj1 >> mdadm: No md superblock detected on /dev/sdj1. >> mdadm --examine /dev/sdi1 >> mdadm: No md superblock detected on /dev/sdi1. > > The --examine output indicates the RAID10 array was 8 members, not 6. > As it stands, you are missing two array members (presumably a mirrored > pair as mdadm won't start the array). Without these you're missing 512K > of every 2M in the array, so your data is toast (well, with a lot of > effort you may recover some files under 1.5M in size). > > Were you expecting sdi1 and sdj1 to have been part of the original > RAID10 array? Have you removed the superblocks from them at any point? > For completeness, what mdadm and kernel versions are you running? > > Cheers, > Robin > -- > ___ > ( ' } | Robin Hill <robin@xxxxxxxxxxxxxxx> | > / / ) | Little Jim says .... | > // !! | "He fallen in de water !!" | -- 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
