Public bug reported:
dmsetup, libdevmapper1.02: 1.02.08-1ubuntu10
lvm-common: 1.5.20ubuntu12
lvm2: 2.02.06-2ubuntu9
Running "lvcreate -s" to create an LVM snapshot takes about 10 minutes
to complete, where it should be instantaneous. stracing lvcreate shows
a lot of waiting for devices to exist (VG name is mlc2, snapshot name
strace-test)
stat64("/dev/mapper/mlc2-strace--test", 0xbfb917c8) = -1 ENOENT (No such file
or directory)
nanosleep({0, 10000000}, NULL) = 0
stat64("/dev/mapper/mlc2-strace--test", 0xbfb917c8) = -1 ENOENT (No such file
or directory)
nanosleep({0, 20000000}, NULL) = 0
Then does a lot of waiting for another device:
stat64("/dev/mapper/mlc2-strace--test-cow", 0xbfb917d8) = -1 ENOENT (No such
file or directory)
nanosleep({0, 10000000}, NULL) = 0
stat64("/dev/mapper/mlc2-strace--test-cow", 0xbfb917d8) = -1 ENOENT (No such
file or directory)
nanosleep({0, 20000000}, NULL) = 0
etc.
In accordance with bug 38409, I currently have "KERNEL=="dm-[0-9]*",
OPTIONS+="ignore_device"" set in /etc/udev/rules.d/20-names.rules. No
other changes have been made to udev. I will try removing the change
(which should no longer be required) on my test box.
Side note: due to a bug in my rotation script, I found I had about 20
snapshots on a machine the other day. It then wouldn't boot, as per bug
103866 - when I removed all the snapshots, mounting the volume of which
all the snapshots are taken, worked.
** Affects: lvm2 (Ubuntu)
Importance: Undecided
Status: Unconfirmed
--
lvm snapshots take almost 10 minutes
https://bugs.launchpad.net/bugs/110380
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