On 7/10/19 4:56 AM, Andrey Zhunev wrote: > Hello All, > > I am struggling to recover my system after a PSU failure, and I was > suggested to ask here for support. > > One of the hard drives throws some read errors, and that happen to be > my root drive... > My system is CentOS 7, and the root partition is a part of LVM. > > [root@mgmt ~]# lvscan > ACTIVE '/dev/centos/root' [<98.83 GiB] inherit > ACTIVE '/dev/centos/home' [<638.31 GiB] inherit > ACTIVE '/dev/centos/swap' [<7.52 GiB] inherit > [root@mgmt ~]# > > [root@tftp ~]# file -s /dev/centos/root > /dev/centos/root: symbolic link to `../dm-3' > [root@tftp ~]# file -s /dev/centos/home > /dev/centos/home: symbolic link to `../dm-4' > [root@tftp ~]# file -s /dev/dm-3 > /dev/dm-3: SGI XFS filesystem data (blksz 4096, inosz 256, v2 dirs) > [root@tftp ~]# file -s /dev/dm-4 > /dev/dm-4: SGI XFS filesystem data (blksz 4096, inosz 256, v2 dirs) > > > [root@tftp ~]# xfs_repair /dev/centos/root > Phase 1 - find and verify superblock... > superblock read failed, offset 53057945600, size 131072, ag 2, rval -1 > > fatal error -- Input/output error look at dmesg, see what the kernel says about the read failure. You might be able to use https://www.gnu.org/software/ddrescue/ to read as many sectors off the device into an image file as possible, and that image might be enough to work with for recovery. That would be my first approach: 1) use dd-rescue to create an image file of the device 2) make a copy of that image file 3) run xfs_repair -n on the copy to see what it would do 4) if that looks reasonable run xfs_repair on the copy 5) mount the copy and see what you get But if your drive simply cannot be read at all, this is not a filesystem problem, it is a hardware problem. If this is critical data you may wish to hire a data recovery service. -Eric > [root@tftp ~]# > > > smartctl shows some pending sectors on /dev/sda, and no reallocated > sectors (yet?). > > Can someone please give me a hand to bring root partition back to life > (ideally)? Or, at least, recover a couple of critical configuration > files... > > > --- > Best regards, > Andrey >
