system hang with rsync

[Matthew Dillon]

:Hello.
:
:Doing a backup to our DragonFly file server, using rsync, hangs the
:server under certain conditions.  
:
:It only happens when I use the *--delete* option to rsync and seems to
:only be on directories with large multi-GB files.  The directory that
:consistently reproduces it is my tv recording directory where I have
:multiple files ranging from 1 to 4 GB.  The total directory on the
:server is about 67 GB, which has old files that need deleted.  The
:directory on the client machine is currently about 79 GB. 
:
:While the server is hung, I can still ping it and switch virtual
:consoles but, other than that, all consoles are just frozen.  While it
:is frozen, if I hit <cntl>c I see the '^C' on the screen but get no
:other response.

    My guess is that there is a buffer cache issue on the server that
    is causing a deadlock.

    If you sync every second on the server while running your test, does
    it still hang?

						-Matt