Coda File System

Re: max venus cache size?

From: Brian Finney <>
Date: Thu, 9 Sep 2004 14:14:43 -0500
Thanks for all the help

right now I'm doin a general update and will start seting up coda tonight


On Thu, 9 Sep 2004 12:08:18 -0400, Jan Harkes <> wrote:
> On Thu, Sep 09, 2004 at 04:31:21AM -0500, Brian Finney wrote:
> > curios what is considered to be the current max size for the venus cache
> As far as the amount of data is concerned, probably about as much as
> your harddrive can handle. The limiting factor is the number of files.
> More files mean that we need more memory to store the metadata, we need
> more CPU time to scan for possible replacements, and it takes longerto
> revalidate the cache after a disconnection.
> Now there is this estimated formula built into venus that assumes that
> a typical user has an average file size of 24KB, about 4 files per
> directory, 256 files in a volume, etc. So with the default ratios, the
> cache probably shouldn't be larger than several hundred megabytes.
> 200MB is approximately 8000 files and requires only about 20MB of RVM.
> I've heard several reports that 500MB caches (20000 files) can
> sometimes suffer from considerable stalls, so memory doesn't really
> seem to be the limiting factor here.
> However...
> > I'm wanting to try coda starting with using it between my laptop and
> > server, primarily for use with collections of movies, mp3s, and other
> > files that would easily surpass these limits, and then if every thing
> Your average filesize is several orders higher than our assumed
> 24KB/file. So it would make sense to tweak some of the values in
> /etc/coda/venus.conf.
> cacheblocks=10000000 # 10 GB cache
> cachefiles=10000     # 10k files
> cml_entries=40000    # 4 log entries per file.
> hoard_entries=1000   # I 'think' this should be enough :)
> (I really should change the cml_entries and hoard entries defaults to be
> relative to the # of cachefiles and not the # of cacheblocks...)
> Jan
Received on 2004-09-09 15:17:26