Cannot compact 1 database (Insufficient Space)

I have a mail database (6.5.2 user) based on iNotes6.ntf that cannot be compacted using option in Administration client. It attempts to run a few minutes later says “Cannot compact user.nsf: Insufficient Space.” I cannot understand this because the filesystem has plenty of space remaining + other mail databases compact fine. Thoughts?

Subject: Cannot compact 1 database (Insufficient Space)

Try using l compact mailfile -c -L -i. The “-i” will tell the system to ignore any errors.