On 10/07/2012 07:33 AM, Paul LeoNerd Evans wrote:
On Tue, Feb 14, 2012 at 06:20:57PM +0000, Paul LeoNerd Evans wrote:
On Mon, Feb 13, 2012 at 05:40:34PM +0000, Alasdair G Kergon wrote:
dmsetup info -c
dmsetup table
dmsetup status
will show the current device-mapper state
It appears to have happened again:
root@cel:~
# lvremove --force vg_cel/backups-20120117
/dev/vg_cel/backups-20120117: read failed after 0 of 4096 at 161061208064:
Input/output error
/dev/vg_cel/backups-20120117: read failed after 0 of 4096 at 161061265408:
Input/output error
/dev/vg_cel/backups-20120117: read failed after 0 of 4096 at 0: Input/output
error
/dev/vg_cel/backups-20120117: read failed after 0 of 4096 at 4096:
Input/output error
Unable to deactivate open vg_cel-backups--20120117-cow (254:31)
Failed to resume backups-20120117.
libdevmapper exiting with 3 device(s) still suspended.
I have the same problem as well. After reboot I would be able to finally
delete the device. This device would no longer be a snapshot by then. I
noted that if the device is mirrored (lvm mirror) I get the problem
every time. However, if the device is not mirrored, for instance I tried
with swap files that are not, then I do not get the problem. So I
mirrored the entire server and I was able to do my backups. Note that I
was unable to get out of this using the dmsetup resume idea as described
before, my device do not seem to get suspended.
I have a freshly installed Ubuntu server in operation, I'll get to test
on Tuesday to see if I get the same problem. If I do not I'll report the
different versions of software & kernel used then. Do we know if the
problem is still there in sid? In the mean time I may have to
re-install my server using md mirrored raid and lvm on top instead.
root@cel:~
# lvs
[at this point the process is hard dead, no SIGTERM etc.. can wake it]
[on another terminal...]
root@cel:~
# ps -lp 26009
F S UID PID PPID C PRI NI ADDR SZ WCHAN TTY TIME CMD
4 D 0 26009 25789 0 80 0 - 6384 ? pts/9 00:00:00 lvs
root@cel:~
# kill -9 26009
root@cel:~
# ps -lp 26009
F S UID PID PPID C PRI NI ADDR SZ WCHAN TTY TIME CMD
4 D 0 26009 25789 0 80 0 - 6384 - pts/9 00:00:00 lvs
dmsetup info -c
dmsetup table
dmsetup status
Fortunately even in this state these three commands still work OK. Find
attached current outputs from them.
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