My Macbook Pro (10.6.8) locks up every day at noon for several minutes (and often after sleep).
I put 'Activity Monitor' up front right before noon sorted by %CPU, and saw that it ran 'fsck_hfs'. Kinda makes sense that this would make my machine unusable.
I can kinda simulate this behavior by running it by hand (or 'Disk Utility').
What is making the Mac run a disk check so often, and how do I stop/delay/fix the root cause?
There's nothing in root's crontab, and Disk Utility reports the disk is fine. I also single-user booted and ran '/sbin/fsck -fy' with no errors reported.
I do see some "LSOF: File foo left open on device" errors from 'mds' around this time - not sure if related.