Hi Mikulas, Sorry to trouble you. I recently noticed dm-writecache in the dm dir, and want to have a try. But I failed to setup a basic writecache dm using dmsetup: # dmsetup create testwbc --table "0 512000000 writecache s /dev/md1p5 /dev/md1p6 1024" device-mapper: reload ioctl on testwbc failed: Invalid argument Command failed In dmesg, there is: [ 7863.034468] device-mapper: table: 253:0: writecache: Invalid number of feature args [ 7863.034476] device-mapper: ioctl: error adding target to table I wonder what is the exact args to dmsetup? Thanks, shenghui -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
