>Number: 175323
>Category: kern
>Synopsis: Fail to use ZVOL as a gmirror component
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Tue Jan 15 12:00:00 UTC 2013
>Closed-Date:
>Last-Modified:
>Originator: Alexei Volkov
>Release: 9.1-RELEASE
>Organization:
SoftLynx
>Environment:
FreeBSD fresh-inst 9.1-RELEASE FreeBSD 9.1-RELEASE #0 r243825: Tue Dec 4 09:23:
10 UTC 2012 r...@farrell.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC amd64
>Description:
kernel: GEOM_MIRROR (error=45) while trying to use ZFS volumes (ZVOL) geoms as
a geom_mirror component.
>How-To-Repeat:
# zfs create -V10G tank0/vol0
# diskinfo -v /dev/zvol/tank0/vol0
/dev/zvol/tank0/vol0
512 # sectorsize
10737418240 # mediasize in bytes (10G)
20971520 # mediasize in sectors
0 # stripesize
0 # stripeoffset
# gmirror label mirror0 /dev/zvol/tank0/vol0
GEOM_MIRROR: Cannot add disk zvol/tank0/vol0 to mirror0 (error=45).
GEOM_MIRROR: Device mirror0 destroyed.
gmirror list is empty and gmirror list -a shows:
Geom name: mirror0
Consumers:
1. Name: zvol/tank0/vol0
Mediasize: 10737418240 (10G)
Sectorsize: 512
Mode: r1w1e1
Right after the sequence above, the block device zvol/tank0/vol0 is not any
more available for writing it (seems to be locked by geom_mirror)
# dd if=/dev/zero of=/dev/zvol/tank0/vol0
dd: /dev/zvol/tank0/vol0: Operation not permitted
And i was not able to release it.
# gmirror forget mirror0
gmirror: No such device: mirror0.
# gmirror clear /dev/zvol/tank0/vol0
Can't clear metadata on /dev/zvol/tank0/vol0: Operation not permitted.
gmirror: Not fully done.
# zfs destroy -f tank0/vol0
cannot destroy 'tank0/vol0': dataset is busy
The only way to destroy ZVOL is temporarily block geaom_morror loading during
the boot process, reboot and destroy zvols.
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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