|
Hi, I was setting up for some dm-cache testing this weekend (using 3.9.0-rc7 x86_64) and ran into the following: # dmsetup create cache --table '0 41943040 cache /dev/mapper/metadata /dev/mapper/ssd /dev/mapper/origin 512 1 writeback default 0' device-mapper: reload ioctl on cache failed: Block device required Command failed # After this error, /var/log/messages contains: [75376.089354] device-mapper: cache metadata: sb_check failed: blocknr 18446744073709551615: wanted 0 [75376.089362] device-mapper: block manager: superblock validator check failed for block 0 [75376.089364] device-mapper: cache metadata: couldn't read lock superblock [75376.095173] device-mapper: table: 253:5: cache: Error creating metadata object [75376.095180] device-mapper: ioctl: error adding target to table This comes from sb_check() in drivers/md/dm-cache-metadata.c and drivers/md/dm-thin-metadata.c, and it motivated me to try: # dd if=/dev/zero of=/dev/mapper/metadata bs=4k conv=notrunc Afterwards, I tried “dmsetup create cache” again and it worked fine. Regards, Morgan Mears |
-- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
