On Fri, Dec 06, 2013 at 04:49:14PM +0100, Steinar H. Gunderson wrote: > Linux (3.12.0-rc5) hung, and on boot, I can't get the dm-cache up again: > > (initramfs) echo 0 23440891904 cache /dev/cache/metadata /dev/cache/blocks /dev/md1 1024 1 writeback > default 4 random_threshold 8 sequential_threshold 512 | dmsetup create cache -u CACHE-0a8bb56fc873c195bf7117af925c7f08 > device-mapper: reload ioctl on cache failed: Input/output error > Command failed > > The kernel complains with > > [ 639.189756] attempt to access beyond end of device > [ 639.189761] dm-0: rw=0, want=18445688752888627208, limit=1048576 > [ 639.189764] device-mapper: transaction manager: couldn't open metadata space map > [ 639.189767] device-mapper: cache metadata: tm_open_with_sm failed > [ 639.283130] device-mapper: table: 254:2: cache: Error creating metadata object > [ 639.283134] device-mapper: ioctl: error adding target to table > > Is there anything I can do short of nuking the metadata partition > and taking the loss of whatever wasn't written back? Yep, grab: https://github.com/jthornber/thin-provisioning-tools build, and then try cache_check on it (which should tell you what's wrong). Other programs to play with are cache_dump, cache_restore and cache_repair. Let me know how it goes, - Joe -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
