`remove_mirror` seems to fail occasionally due to a race condition:
```
loli@openindiana:~$ sudo mkfile 512m /tmp/dsk1
loli@openindiana:~$ sudo mkfile 512m /tmp/dsk2
loli@openindiana:~$ sudo mkfile 512m /tmp/dsk3
loli@openindiana:~$ sudo zpool create -f testpool /tmp/dsk1 mirror /tmp/dsk2
/tmp/dsk3
loli@openindiana:~$ sudo zpool remove testpool /tmp/dsk1
loli@openindiana:~$ sudo zpool remove testpool /tmp/dsk2
cannot remove /tmp/dsk2: operation not supported on this type of pool
loli@openindiana:~$ sudo zpool add testpool /tmp/dsk1 || zpool status testpool
invalid vdev specification
use '-f' to override the following errors:
/tmp/dsk1 is part of active pool 'testpool'
pool: testpool
state: ONLINE
scan: none requested
remove: Evacuation of /tmp/dsk1 in progress since Sun Feb 4 09:47:45 2018
26.5K copied out of 26.5K at 26.5K/s, 100.00% done, 0h0m to go
config:
NAME STATE READ WRITE CKSUM
testpool ONLINE 0 0 0
/tmp/dsk1 ONLINE 0 0 0
mirror-1 ONLINE 0 0 0
/tmp/dsk2 ONLINE 0 0 0
/tmp/dsk3 ONLINE 0 0 0
errors: No known data errors
```
This is a tentative fix and isn't to be merged.
You can view, comment on, or merge this pull request online at:
https://github.com/openzfs/openzfs/pull/534
-- Commit Summary --
* XXX Attempt to fix remove_mirror
-- File Changes --
M usr/src/test/zfs-tests/runfiles/delphix.run (7)
M usr/src/test/zfs-tests/tests/functional/removal/remove_mirror.ksh (1)
-- Patch Links --
https://github.com/openzfs/openzfs/pull/534.patch
https://github.com/openzfs/openzfs/pull/534.diff
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