Somehow I've managed to get ZFS on one of my machines into a state where
it won't reclaim all space after deleting files AND snapshots off of it:
(this is with 7.2-STABLE amd64, compiled June 10)
# ls -la /weird
total 4
drwxr-x--- 2 mysql mysql 2 Jun 19 02:42 .
drwxr-xr-x 29 root wheel 1024 Jun 19 02:44 ..
# df /weird
Filesystem 1K-blocks Used Avail Capacity Mounted on
scotch/weird 282201472 109151232 173050240 39% /weird
# zfs list scotch/weird
NAME USED AVAIL REFER MOUNTPOINT
scotch/weird 104G 164G 104G /weird
# zfs list -t snapshot | grep scotch/weird
# zfs get all scotch/weird
NAME PROPERTY VALUE SOURCE
scotch/weird type filesystem -
scotch/weird creation Wed Jun 17 1:20 2009 -
scotch/weird used 104G -
scotch/weird available 159G -
scotch/weird referenced 104G -
scotch/weird compressratio 1.00x -
scotch/weird mounted yes -
scotch/weird quota none default
scotch/weird reservation none default
scotch/weird recordsize 128K default
scotch/weird mountpoint /weird local
scotch/weird sharenfs off default
scotch/weird checksum on default
scotch/weird compression off default
scotch/weird atime off local
scotch/weird devices on default
scotch/weird exec off local
scotch/weird setuid off local
scotch/weird readonly off default
scotch/weird jailed off default
scotch/weird snapdir hidden default
scotch/weird aclmode groupmask default
scotch/weird aclinherit restricted default
scotch/weird canmount on default
scotch/weird shareiscsi off default
scotch/weird xattr off temporary
scotch/weird copies 1 default
scotch/weird version 3 -
scotch/weird utf8only off -
scotch/weird normalization none -
scotch/weird casesensitivity sensitive -
scotch/weird vscan off default
scotch/weird nbmand off default
scotch/weird sharesmb off default
scotch/weird refquota none default
scotch/weird refreservation none default
scotch/weird primarycache all default
scotch/weird secondarycache all default
scotch/weird usedbysnapshots 0 -
scotch/weird usedbydataset 104G -
scotch/weird usedbychildren 0 -
scotch/weird usedbyrefreservation 0 -
If I then rsync stuff to it, space seems OK, if I continue to rsync to it
every few hours, the used space grows, even if no snapshots are being taken
If I do take snapshots, then change stuff, then delete the snapshots, the
snapshot space does appear to be reclaimed. Also if I 'zfs destroy' the
filesystem, the space is correctly reclaimed, but once I create a new one
and repeat the process, the problem reappears.
I have not had any luck reproducing this on another machine yet, but
admittedly haven't tried super hard yet.
Scrubbing the zpool returns no errors.
I'm guessing zdb is my only hope at debugging this, but as I've never used
it before and as it seems to dump core whenever I try running it, can
someone suggest what I need to check/look for in it?
I did also have a panic a few days ago that, based on the text, might be
related (I do have the vmdump and core.txt)
panic: solaris assert: P2PHASE(start, 1ULL << sm->sm_shift) == 0, file:
/usr/src/sys/modules/zfs/../../cddl/contrib/opensolaris/uts/common/fs/zfs/space_map.c,
line: 146
...for which I have a vmdump and a core.txt if anyone wants to look at it.
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