Coda File System

Re: Larger then 10GB Coda server?

From: Peter J. Braam <>
Date: Sun, 9 May 1999 10:38:06 -0400 (EDT)
Hi Rob,

First of all, like I do with everyone, I really urge you to first play
with Coda on a smaller scale.  You may not like it and will need to gain
some experience. What you are asking is currently well beyond what we feel
comfortable doing ourselves - and 150G leads to metadata well beyond what 
can be memory mapped on 32bit architectures (unless you have large files
on average).

It looks like 150M is out of reach without a major re-engineering of Coda
meta data on the server - however ~30GB might well be possible (using
something like 1G of RVM data) [you'd need to do things differently from
the currently installation, but I have successfully done rapid starups of
such servers, contact me for some patches.] The issues are described in

[What you shouldn't forget is that backup volumes also take space, they
take 500B/file and 500B/dir.] 

How many users are going to be using this installation?  Commonly we would
have a Coda volume for each user and there is a limit of 1024 volumes (or
1000 I forget). This could also be an issue, but is easy to change.

- Peter -

On Fri, 7 May 1999, Rob Towner wrote:

> I am interested in implementing Coda on my network and I would like to
> ask some questions on this list. I have 4 campuses connected by T1 lines
> and I would like to dedicate 30 GB of disk space in Coda to each campus.
> My current thinking of the ideal configuration is as follows. One Coda
> server with 150 GB in Coda on a raid set. Each of the four campuses
> would have a server which run the Coda client and would serve files via
> Samba to win 95 workstations.
> I am aware that currently Coda only scales up to 10 GB per server. Would
> I be totally wasting my time if I tried to get Coda working with 150 GB
> or is there a chance that I could make it work? Would putting a 30 GB
> Coda server at each campus be a better solution?
> The Coda HOWTO says to not make a venus cache larger then 300 MB. The
> setup script says I can use half the available space on the partition
> for the venus cache. How large can I make a venus cache? I want to use a
> very large cache because my WAN is very slow. In fact, I would like to
> use a 30 GB venus cache on the campus servers.
> By now you probably think I'm crazy. :)
> Rob Towner
> CIS, Network Assistant
> Yuma Union High School District
> Yuma Educational Consortium
Received on 1999-05-09 10:38:51