https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=216881
Bug ID: 216881
Summary: zpool detach hangs if autoexpand is set to on.
Product: Base System
Version: 11.0-RELEASE
Hardware: amd64
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
CC: [email protected]
FreeBSD curlew.lan 11.0-RELEASE-p2 FreeBSD 11.0-RELEASE-p2 #0: Mon Oct 24
06:55:27 UTC 2016
[email protected]:/usr/obj/usr/src/sys/GENERIC amd64
zpool detach hangs and eventually freezes the entire system if autoexpand is
set to on.
After rebooting the detached device is still shown in the pool but is
inaccessible and cannot be removed
For example, starting with this pool:
root@fbsd11:~ # zpool status
pool: test
state: ONLINE
scan: resilvered 74.5K in 0h0m with 0 errors on Mon Feb 6 13:55:04
2017
config:
NAME STATE READ WRITE CKSUM
test ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
gpt/ztest1 ONLINE 0 0 0
gpt/ztest2 ONLINE 0 0 0
errors: No known data errors
root@fbsd11:~ # zpool get autoexpand
NAME PROPERTY VALUE SOURCE
test autoexpand on local
If I attempt to detach test gpt/ztest2 it hangs and after rebooting I have the
following:
root@fbsd11:~ # zpool status
pool: test
state: DEGRADED
status: One or more devices could not be opened. Sufficient replicas
exist for
the pool to continue functioning in a degraded state.
action: Attach the missing device and online it using 'zpool online'.
see: http://illumos.org/msg/ZFS-8000-2Q
scan: resilvered 74.5K in 0h0m with 0 errors on Mon Feb 6 13:55:04
2017
config:
NAME STATE READ WRITE CKSUM
test DEGRADED 0 0 0
mirror-0 DEGRADED 0 0 0
gpt/ztest1 ONLINE 0 0 0
12467057712079289495 UNAVAIL 0 0 0 was
/dev/gpt/ztest2
errors: No known data errors
At this stage the former gpt/ztest2 cannot be detached or reattached until I
set autoexpand to off which then enables me to detach it.
A similar problem was resolved with FreeNAS in November and might be relevant -
https://bugs.pcbsd.org/issues/14337
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