On Mon, Sep 15, 2014 at 02:48:23PM -0500, Ross Anderson wrote: > I'd appreciate any help in troubleshooting this. Quiet frustrating not being > able to use mpath on 4k blocks. Doesn't seem related to sector size. > http://pastebin.com/EbTMXdvE > ###partx -a-v > partition: none, disk: /dev/dm-0, lower: 0, upper: 0 > /dev/dm-0: partition table type 'gpt' detected > partx: /dev/dm-0: adding partition #1 failed: Invalid argument partx is trying to call a BLKPG partition management ioctl on a device-mapper device. Since dm devices are not partitionable it fails with EINVAL. > partx: /dev/dm-0: adding partition #2 failed: Invalid argument > partx: /dev/dm-0: error adding partitions 1-2 The partx program comes from the util-linux package: $ qwhich partx util-linux-2.24.2-1.fc20.x86_64 You're probably looking for kpartx which is part of multipath-tools. On Red Hat distros it's in a separate sub-package named kpartx: $ qwhich kpartx kpartx-0.4.9-56.fc20.x86_64 The kpartx command reads partition data from the disk and creates device-mapper linear maps corresponding to each discovered partition. This allows you to access the partitions on a device-mapper device as separate dm devices (e.g. you'd get devices with paths like '/dev/mapper/dm-0p1' or whatever depending on the -p switch given). Most distros today will automatically run kpartx when new multipath devices appear or when they change so you shouldn't need to run it manually all the time. Regards, Bryn. -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
