Coda File System

Re: maximum cache size in venus

From: Steve Simitzis <>
Date: Mon, 10 May 2004 20:17:39 -0700
On 05/10/04, Jan Harkes <> wrote: 

> I don't know. My cache is typically in the order of 200-250MB.

well, i'll continue my experiments then, to see how high i can raise
the cache without problems. i finally hit a crash at 1.9GB, unfortunately,
so my theory about a 2GB upper bound is now dead in the water. :)

another consideration is, how high should a cache be for a given
quantity of data? should i reasonably expect that i should be able to
cache the entire filesystem, so venus can maintain somewhat of a local
disk copy of everything, or should i think of it more as a true cache
of the data?

i currently have 19GB of data, so a 250MB cache probably isn't too
shabby. though, a larger cache has saved me in situations when
codasrv dies or becomes unreachable.

tradeoffs, tradeoffs.

> 266 is precisely 256 + 10, which would match a wraparound on the link
> count field. But... we don't have cross-directory hardlinks, and I find
> it hard to believe that you would have so many links to one object in a
> single directory.

i also find it hard to believe. our entire dataset is content uploaded
via web forms, with little or no direct human interaction. there are
no extra links, hard or soft.


steve simitzis : /sim' - i - jees/
          pala : saturn5 productions : 415.282.9979
  hath the daemon spawn no fire?
Received on 2004-05-10 23:22:24