- If a CIFS client is switched off, is there any sort of keepalive timer
on the Filer that closes down open files and locks?
AFAIK, yes, but I don't know the parameters specified by the protocol.
- Should a PC with read-only access to a filestore be allowed to lock
files for exclusive read?
Yes?
Should this perhaps be an option on a qtree or share?
No? This is the same as NT/Windows handles it.
- This particular application obviously doesn't expect this file to be
shared. But could any malicious user take out locks on random important files and freeze the whole network?
Yep. Just another disadvantage of Windows.
Bruce