Date: Tue, 17 Mar 2015 11:18:32 +0100 From: =?iso-8859-1?Q?Marcus_M=FCller?= <znek@mulle-kybernetik.com> To: freebsd-fs@FreeBSD.org Subject: zfs destroy dry-run lying about reclaimable space? Message-ID: <C8EE00D4-54B0-436A-99D5-82FDA0FFE561@mulle-kybernetik.com>
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[-- Attachment #1 --] Hi ZFS experts, I just stumbled across this one: root@tank:(/)# zfs-destroy-snapshots.sh -n tank/usr/local would destroy tank/usr/local@zfs-auto-snap_monthly-2014-04-01-00h28 would reclaim 53.6M would destroy tank/usr/local@zfs-auto-snap_monthly-2014-05-01-00h28 would reclaim 8.32M would destroy tank/usr/local@zfs-auto-snap_monthly-2014-06-01-00h28 would reclaim 81.4M would destroy tank/usr/local@zfs-auto-snap_monthly-2014-07-01-00h28 would reclaim 170M [...] root@tank:(/)# zfs-destroy-snapshots.sh tank/usr/local will destroy tank/usr/local@zfs-auto-snap_monthly-2014-04-01-00h28 will reclaim 53.6M will destroy tank/usr/local@zfs-auto-snap_monthly-2014-05-01-00h28 will reclaim 191M will destroy tank/usr/local@zfs-auto-snap_monthly-2014-06-01-00h28 will reclaim 1.17G will destroy tank/usr/local@zfs-auto-snap_monthly-2014-07-01-00h28 will reclaim 177M [...] zfs-destroy-snapshots.sh iterates on all snapshots of the given filesystem and calls zfs destroy -v [-n] <snapshot>, no magic involved. I was a bit stumped by the fact that the sum of the reclaimable space reported via dry-run of zfs-destroy-snapshots.sh wasn't anywhere near the supposed "usedbysnapshots" value of the filesystem, so I just deleted all snapshots for real to see what would happen. Unfortunately I cannot zfs diff any of them now to get any clues why the dry-run would be so wrong, but maybe anyone else knows? Is this a known bug already? Cheers, Marcus -- Marcus Mller . . . http://www.mulle-kybernetik.com/znek/ [-- Attachment #2 --] 0 *H 01 0 + 0 *H x0t0\0 *H 01 0 UDE10UDortmund1 0 UNRW10U Mulle kybernetiK10U CryptoMull1)0' *H admin@mulle-kybernetik.com0 071113224411Z 171110135915Z0C10U Marcus Müller1(0& *H znek@mulle-kybernetik.com0"0 *H 0 7xp/dSӯ|_ cylY$~L }^160-%&P m{ Hw\ \~)ѭ7Z|jd hXGqō_-KFfIlCYheMK G1 o.<*7ӱCV숱3B ?A l9w=ǜ>? EXu4ܪliF{Yr)'q̅{|r *0&0 U 0 0 U :EÅS z>X0U #0kJr'o x/|S01 0 UDE10UDortmund1 0 UNRW10U Mulle kybernetiK10U CryptoMull1)0' *H admin@mulle-kybernetik.com0 U 0 `HB0 `HB xca certificate0 *H LjSUsNV*k1*|@cۊ+FD%' Uϕ i؟ܣ~g] aE}d<%4\ -Pڇ> 0)e4RͦwdӦhcWL@<&tW8v6-dUﾳHH &A8%,Yܗ+eYXǜ K Ւ"AT@#Eg$&]7 A69۞N>ݡ+:Q|ũx 7k6E;o26(Ri2)èRʩor0հ̛o([XX HXA %. >&E'` l}E;pB*Do]*o1V2Ҭ5+|y LlȰp Z8ݫ7`ȃP]0i r%JAA]9T'.x燾urn1`0\001 0 UDE10UDortmund1 0 UNRW10U Mulle kybernetiK10U CryptoMull1)0' *H admin@mulle-kybernetik.com0 + 0 *H 1 *H 0 *H 1 150317101832Z0# *H 1 뾁G_ n0 +71001 0 UDE10UDortmund1 0 UNRW10U Mulle kybernetiK10U CryptoMull1)0' *H admin@mulle-kybernetik.com0 *H 101 0 UDE10UDortmund1 0 UNRW10U Mulle kybernetiK10U CryptoMull1)0' *H admin@mulle-kybernetik.com0 *H N{`,`'ݓHf`{ZVGħI/GCXSF- NZSX|k/Y!Jb0^ID?U 9x0Cc ?QDD9! "fވ*;wU|2Jj ON<f&Wm>g, ziFRLO?3h ݨ5o`Ppo,r0XK ~ˌhome | help
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