Towards the end of July I attempted to post about this problem to toasters, but mathworks took a dislike to the messages for some reason, and so you may not have seen them.
Summary of the original problem: when removing the home directory for a particular cancelled account, the usage accounted against quota did not fall to zero, but to 1376 KB and 896 inodes. No trace of these 896 files could be found within the filing system, but "quota off" & "quota on" exactly regenerated the usage values.
Since then I have had the opportunity to run "wafliron" on ("vol copy"s of) the filing system, and it recovered exactly the lost 896 files into /lost+found. Some detective work suggests that the inodes got detached from the filing system almost as soon as they had been created (over 2 years ago): there is evidence of an unzip by the user going over quota being involved. At that time we were running 6.1R1. It is possibly significant that 896 is exactly 7 blocks worth of directory entries, provided the names are short enough.
Chris Thompson Email: cet1@cam.ac.uk