Hi all,
I'm trying to work out how to force-remove a dm device after the
underlying disks failed. Because the kernel is still trying to write
blocks to the failed devices, I can't unmount the filesystem, so I
don't seem to be able to just drop the data, get some errors, then have
everything unmounted and clean, ready to try again.
$ dmsetup remove backup
device-mapper: remove ioctl on backup failed: Device or resource busy
Command failed
Using --force says it will replace the device with one that returns I/O
errors which sounds perfect, but that just locks up:
$ dmsetup remove --force backup
^C^C^\^\
Running it through strace shows it getting stuck in the kernel:
$ strace dmsetup remove --force backup
[...]
access("/run/udev/control", F_OK) = 0
open("/dev/urandom", O_RDONLY) = 4
read(4, "\2\325", 2) = 2
semget(0xd4dd502, 1, IPC_CREAT|IPC_EXCL|0600) = 458754
semctl(458754, 0, SETVAL, 0x1) = 0
semctl(458754, 0, GETVAL, 0x7f254875c47a) = 1
close(4) = 0
semop(458754, {{0, 1, 0}}, 1) = 0
semctl(458754, 0, GETVAL, 0x7f254875c417) = 2
ioctl(3, DM_DEV_SUSPEND
Is there any way to forcefully remove a dm device, or do you have to
reboot to remove failed devices?
I'm running kernel 4.1.4.
Many thanks,
Adam.
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