Date: Sun, 21 Nov 2010 22:22:24 +0100 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-current@freebsd.org Subject: tmpfs out of space (ZFS related?) Message-ID: <icc2ih$e5t$1@dough.gmane.org>
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I got a curious error today while starting PostgreSQL, complaining about "out of space" errno while creating lock file on /tmp. /tmp on this machine is mounted as tmpfs and indeed, here is the statistic: biggie:/# df -i Filesystem 1M-blocks Used Avail Capacity iused ifree %iused Mounted on /dev/mfid0s1a 9912 5193 3926 57% 306079 1012831 23% / devfs 0 0 0 100% 0 0 100% /dev fdescfs 0 0 0 100% 4 11092 0% /dev/fd tmpfs 0 0 0 100% 9 0 100% /tmp tank 376044 0 376044 0% 4 770138347 0% /tank tank/ports 376658 614 376044 0% 145919 770138347 0% /usr/ports tank/mysql 376073 29 376044 0% 102 770138347 0% /var/db/mysql tank/pgdata90 400469 24425 376044 6% 1047 770138347 0% /tank/pgdata90 On the other hand, "top" reports this: last pid: 79667; load averages: 0.08, 0.68, 0.77 up 1+09:12:13 00:11:33 44 processes: 1 running, 43 sleeping CPU: 0.0% user, 0.0% nice, 0.0% system, 0.0% interrupt, 100% idle Mem: 13M Active, 46M Inact, 15G Wired, 232K Cache, 1458M Buf, 8358M Free Swap: 1024M Total, 1024M Free Note the "8358M free" report. The server has ZFS and was doing IO intensive database work on it; the 8 GB free memory comes from PostgreSQL being restarted and freeing the memory (but failing to start again...). Starting PostgreSQL gets me this message: Nov 22 00:18:24 biggie postgres[79696]: [1-1] FATAL: could not write lock file "/tmp/.s.PGSQL.5432.lock": No space left on device This is 8-STABLE amd64. Running "touch /tmp/abc" works, and creates a file. Running "echo abc > /tmp/abc" doesn't return an error but *doesn't write anything to the file*, just creates a directory entry. The status doesn't change over time, i.e. "df" on tmpfs always shows "0 free".
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