LARGE single-system Cyrus installs?

[Bron Gondwana]

On Thu, Oct 04, 2007 at 03:33:58PM -0700, Vincent Fox wrote:
> 
> 
> Xue, Jack C wrote:
> > At Marshall University, We have 30K users (200M quota) on Cyrus. We use
> > a Murder Aggregation Setup which consists of 2 frontend node, 2 backend
> > nodes 
> Interesting, but this is approximately 15K users per backend.  Which is
> where we are now after 30K users per backend were crushed.  I am much
> more interested in exploring whether Cyrus hits some tipping point where
> a single backend cannot handle more than X users.
> 
> That is our hypothesis right now, that the application has certain limits
> and if you go beyond a certain number of very active users on a
> single backend bad things happen.

We ran over 100,000 users on a single backend for over a year without
problems, but then we had a RAID array failure (3 disks within a day)
with 2Tb of data on a single RAID unit and we learned that users don't
like it when it takes a week to rebuild their email server because you 
just can't push the data any faster than that.  These new big drives
take a LONG time to fill!

We don't do big instances like that any more - they're just too
unwieldy.

Bron.