[OpenAFS-devel] cached data on disk

[Derek Atkins]

Yes, the disk cache uses an LRU algorithm to decide when to throw data
out of the cache.  However, the cache size is not a hard limit.  It is
possible to actually over-flow your cache partition before the truncation
algorithm hits.  In that case, you may lose data or crash AFS.

For implementation details you can look at src/afs/afs_dcache.c -- I think
that's where the LRU code is.

-derek

Narasimhan A V <venkatar@cae.wisc.edu> writes:

> Hello,
>         what is the replacement policy used by the cache manager when the
> disk cache overflows. I know that the in memory dcache entries are
> maintained in a LRU queue. Is it LRU for the cached data on disk too.
> If it is how is it implemented ?
> 
> 
> Thanks,
> Narasimhan
> 
> 
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-- 
       Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory
       Member, MIT Student Information Processing Board  (SIPB)
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