Squid 2.1.RELEASE, Digital Unix, and 'disk write error'

Hi

I'm having occasional problems with a Digital Unix machine running Squid
2.1.RELEASE. When the cache filesystem (using Advfs) reaches about 82%
used, Squid decides to repeatedly die with an error in the cache.log
file as follows :-

1999/05/26 09:44:07| diskHandleWrite: FD 38: disk write error: (5) I/O
error
FATAL: Write failure -- check your disk space and cache.log
Squid Cache (Version 2.1.RELEASE): Terminated abnormally.

There is no sign of any problems with the disk in any of the system log
files. Has anyone encountered anything like this ? And has an answer ?

Would I be better off using UFS ? Upgrading Squid ? (I intend to do that
anyway).

-- 
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Mike Meredith/Senior Informatics Officer/University of Portsmouth
Email: mike.meredith@port.ac.uk
WWW:   http://www.iso.port.ac.uk/~mike