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Our sysadmin has left for the day and our production box (which isn't heavily used) is giving messages like

Can't create/write to file '/tmp/#sql_1d2d_0.MYI' (Errcode: 30)

/tmp has gone read only by the looks of it.

Can anyone tell me how to fix this?

Trying umount /tmp gives me "device is busy".

Would like to not restart.

/etc/fstab

ABEL=/ / ext3 defaults,usrquota 1 1
LABEL=/var /var ext3 defaults,usrquota 1 2
LABEL=/boot /boot ext3 defaults 1 2
tmpfs /dev/shm tmpfs defaults 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
LABEL=SWAP-sda3 swap swap defaults 0 0
/usr/tmpDSK /tmp ext3 defaults,noauto 0 0

Mount command output

/dev/sda5 on / type ext3 (rw,usrquota)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
/dev/sda2 on /var type ext3 (rw,usrquota)
/dev/sda1 on /boot type ext3 (rw)
tmpfs on /dev/shm type tmpfs (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
/usr/tmpDSK on /tmp type ext3 (rw,noexec,nosuid,loop=/dev/loop0)
/tmp on /var/tmp type none (rw,noexec,nosuid,bind)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)

df -h output:

Filesystem Size Used Avail Use% Mounted on
/dev/sda5 200G 35G 156G 19% /
/dev/sda2 24G 7.2G 16G 32% /var
/dev/sda1 99M 17M 78M 18% /boot
tmpfs 1013M 0 1013M 0% /dev/shm
/usr/tmpDSK 485M 21M 439M 5% /tmp

I fixed it by the following

lsof | grep /tmp showed me what was using /tmp, I stopped the service (xfs) then managed to run an fsck, fix the inconsistencies and it's now back up :)

But now it's gone down again. Suggestions?

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What is the output of ls -ld /tmp? –  quanta Oct 25 '11 at 6:13
    
@quanta - drwxrwxrwt 6 root root 1380352 Oct 25 15:32 /tmp/ –  John Roberts Oct 25 '11 at 6:13
    
Add contents of /etc/fstab and output of mount and df -h –  Giovanni Toraldo Oct 25 '11 at 6:14
1  
And this is why we have on-call rotas. My suggestion? Ring your sysadmin and hope they are feeling generous. –  Ben Pilbrow Oct 25 '11 at 6:42
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1 Answer

No idea what your sysadmin is trying to achieve with a loop mounted file /usr/tmpDSK for /tmp (and then using a journaling filesystem for it). There's plenty of space on your root partition /dev/sda5, so I guess if you just umount /tmp you'll be fine until he's back.

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