Checkpointing your filesystem
Checkpointing is the process of transitioning filesystems to a clean
(consistent) state. Filesystem data consists of user file data (the
contents of a file) and the data structures used to store the data
(also known as ``meta data''). Recently-accessed data is held
in memory (``cached'') for a short time in case it is needed again.
If the system is stopped unexpectedly, this cached data can be lost.
By default, HTFS, EAFS, AFS, and S51K filesystems periodically ``checkpoint'' (write) cached meta data back to disk. This increases the probability that the filesystem meta data will be in a consistent state if the system is halted unexpectedly. (There may be a small loss of user data, which is not checkpointed.)
If your system should experience a system error, checkpointing will reduce the likelihood that the filesystem will need to be checked and repaired with fsck(ADM) when rebooting, thus mimimizing downtime.