I recently moved some data on a box with limited space. I decided I should
limit the snapshots so that space would not become an issue. I just check
back a week later to find out the box is hitting the borderline. Doing I
quick check I realized that the snapshot_limit is not being respected.
# uname -a
FreeBSD R1 11.0-STABLE FreeBSD 11.0-STABLE #17 r312232: Sun Jan 15 10:59:10
EST 2017 root@S1:/usr/src/11-STABLE/obj/usr/src/11-STABLE/src/sys/MYKERNEL
amd64
# zfs create zroot/bhyve/test
# zfs set snapshot_limit=0 zroot/bhyve/test
# zfs snapshot zroot/bhyve/test@1
# zfs snapshot zroot/bhyve/test@2
# zfs snapshot zroot/bhyve/test@3
# zfs list -t snapshot | grep zroot/bhyve/test
zroot/bhyve/test@1 0 -
88K -
zroot/bhyve/test@2 0 -
88K -
zroot/bhyve/test@3 0 -
88K -
# zfs get all zroot/bhyve/test | grep snapshot
zroot/bhyve/test usedbysnapshots 0 -
zroot/bhyve/test snapshot_limit 0 local
zroot/bhyve/test snapshot_count 3 local
Also wanted to verify 0 was not being mistaken for none.
# for snapshot in `zfs list -t snapshot | grep zroot/bhyve/test | awk
'{print $1}'`; do zfs destroy $snapshot ; done
# zfs get all zroot/bhyve/test | grep snapshot
zroot/bhyve/test usedbysnapshots 0 -
zroot/bhyve/test snapshot_limit 0 local
zroot/bhyve/test snapshot_count 0 local
# zfs set snapshot_limit=1 zroot/bhyve/test
# zfs snapshot zroot/bhyve/test@1
# zfs snapshot zroot/bhyve/test@2
# zfs snapshot zroot/bhyve/test@3
# zfs get all zroot/bhyve/test | grep snapshot
zroot/bhyve/test usedbysnapshots 0 -
zroot/bhyve/test snapshot_limit 1 local
zroot/bhyve/test snapshot_count 3 local
Also tested on head
FreeBSD S1 12.0-CURRENT FreeBSD 12.0-CURRENT #26 r312388: Wed Jan 18
12:38:52 EST 2017
root@S1:/usr/src/head/obj/usr/src/head/src/sys/MYKERNEL-NODEBUG
amd64
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