Public bug reported:
$ lsb_release -rd
Description: Ubuntu 16.04.2 LTS
Release: 16.04
Linux 4.4.0-64-generic
$ apt-cache policy zfsutils-linux
zfsutils-linux:
Installed: 0.6.5.6-0ubuntu15
# modinfo zfs |head
filename: /lib/modules/4.4.0-64-generic/kernel/zfs/zfs/zfs.ko
version: 0.6.5.6-0ubuntu15
I was not able to unmount a ZFS pool:
# zpool export mpu1pool
cannot export 'mpu1pool': pool is busy
The filesystems were unmounted and there was nothing that would be blocking
them FS.
Neither sync, echo 3 > /proc/sys/vm/drop_caches helped.
The only way worked to export a ZFS pool was to turn off the SWAP:
# lsof -Pn |grep -i mpu1
lsof: WARNING: can't stat() fuse.gvfsd-fuse file system /run/user/1000/gvfs
Output information may be incomplete.
# free -mh
total used free shared buff/cache available
Mem: 7.7G 5.1G 502M 837M 2.1G 1.0G
Swap: 8.0G 428M 7.6G
# swapoff -a
# free -mh
total used free shared buff/cache available
Mem: 7.7G 1.5G 4.8G 366M 1.4G 5.2G
Swap: 0B 0B 0B
# zpool export mpu1pool
# echo $?
0
# swapon -a
It is not obvious that the SWAP has to be freed before one can export ZFS pool.
Would it be possible to improve this situation?
Kind regards,
Andrey Arapov
** Affects: zfs-linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1667838
Title:
zpool export mpu1pool cannot export 'mpu1pool': pool is busy
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