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Description
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Trying to promote a dataset doesn't work if less than approximately 100% of the space used by the dataset is also free. I.e. I have a rpool which is 93% full with 1.94GB available, and when I try to promote a dataset I get ENOSPC. I've attached a truss and a zfs list output.
This bug looks similar to 6452872 but happens when significant space is still available. Similarly, this bug is tracked as a bug with beadm(1) at http://defect.opensolaris.org/bz/show_bug.cgi?id=2302 as it has significant OpenSolaris impact.
We've seen this with as much a 6GB still available on the system. We're also
seeing this on systems with as much as 40% of the pool still available.
For example:
# zfs promote rpool/ROOT/opensolaris-2
cannot promote 'rpool/ROOT/opensolaris-2': out of space
# zfs list -o used,available,name rpool
USED AVAIL NAME
4.32G 3.13G rpool
# df -h
Filesystem size used avail capacity Mounted on
rpool/ROOT/opensolaris
7.4G 4.3G 3.1G 58% /
/devices 0K 0K 0K 0% /devices
/dev 0K 0K 0K 0% /dev
ctfs 0K 0K 0K 0% /system/contract
proc 0K 0K 0K 0% /proc
mnttab 0K 0K 0K 0% /etc/mnttab
swap 1.6G 324K 1.6G 1% /etc/svc/volatile
objfs 0K 0K 0K 0% /system/object
sharefs 0K 0K 0K 0% /etc/dfs/sharetab
/usr/lib/libc/libc_hwcap3.so.1
7.4G 4.3G 3.1G 58% /lib/libc.so.1
fd 0K 0K 0K 0% /dev/fd
swap 1.6G 12K 1.6G 1% /tmp
swap 1.6G 40K 1.6G 1% /var/run
rpool/ROOT/opensolaris/opt
7.4G 3.6M 3.1G 1% /opt
rpool/export 7.4G 19K 3.1G 1% /export
#zfs list
NAME USED AVAIL REFER MOUNTPOINT
rpool 4.32G 3.13G 58K /rpool
rpool@install 17.5K - 57.5K -
rpool/ROOT 4.32G 3.13G 18K legacy
rpool/ROOT@install 0 - 18K -
rpool/ROOT/opensolaris 4.32G 3.13G 4.30G legacy
rpool/ROOT/opensolaris@install 3.63M - 2.29G -
rpool/ROOT/opensolaris@opensolaris-2 2.43M - 4.30G -
rpool/ROOT/opensolaris-2 70.5K 3.13G 4.30G legacy
rpool/ROOT/opensolaris-2/opt 0 3.13G 3.60M /opt
rpool/ROOT/opensolaris/opt 3.60M 3.13G 3.60M /opt
rpool/ROOT/opensolaris/opt@install 0 - 3.60M -
rpool/ROOT/opensolaris/opt@opensolaris-2 0 - 3.60M -
rpool/export 511K 3.13G 19K /export
rpool/export@install 0 - 19K -
rpool/export/home 492K 3.13G 474K /export/home
rpool/export/home@install 18K - 21K -
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