Check if a server is about to run fsck

Couple of weeks ago I installed some updates to my server. And when I restarted it, it didn’t came up. To make things worse, the IPMI console decided to go on strike so I couldn’t see what’s really going on. I presumed that the system isn’t responding because of some kernel panic. After a while, I gave up for that night in hope the in the morning the IPMI would be sorted out. To my surprise, the IPMI was still out of work, but the server was up again. Apparently, the system wasn’t stuck on kernel panic, but on fsck‘ing the harddisks. So in order to avoid such problems in the future I looked for a way to tell when the system is going to run fsck after the next reboot (I also had the IPMI fixed).

 $ sudo tune2fs -l /dev/sda6

In the output you will find the following lines:

Mount count:              2
Maximum mount count:      36
Last checked:             Tue Jul 26 04:49:18 2011
Check interval:           15552000 (6 months)

“Maximum mount count” is the number of mounts after which the filesystem will be checked by fsck. “Check interval” is the maximal time between two filesystem checks. The command also lets you see the actual mount count since the last check and when it took place.

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