[OpenAFS] Caching of RW volumes

[Derek Atkins]

Kristian Du <kristian@hitech-sanita.it> writes:

> Hi There,
>
> I was wondering whether afsd/openafs.ko performs any sort of caching of
> the files it fetches from RW volumes. And if it does, does it follow the
> same "rules" used for caching data fetched from RO volumes?
> I was planning to migrate /home on a AFS RW volume and I was worrying
> about an increase in data traffic on the network.

Yes, OpenAFS caches all data, regardless of whether it's readonly
or read-write.  For RW data, the cache manager maintains a callback
for each individual file, whereas readonly data only requires a callback
on the volume.  The fileserver will notify the clients when a file changes
so the client can pull down the new version on the next access.

-derek
-- 
       Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory
       Member, MIT Student Information Processing Board  (SIPB)
       URL: http://web.mit.edu/warlord/    PP-ASEL-IA     N1NWH
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