A number of servers with network storage would be ideal. Unfortunately the initial rollout will require the use of cheap managed hosting boxes. So we'll be restricted to local drives.
I guess the hope is to develop a sort of *standard* way to handle a highly scalable solution with failover with these inexpensive racks. The only real missing piece is the replication to a failover server. There seem to be a number of solutions at: http://linas.org/linux The question is of course what will work best. Kevin > > On Tue, 25 May 2004, Michael Loftis wrote: > >> >> >> --On Tuesday, May 25, 2004 14:39 -0700 Kevin Baker >> <[EMAIL PROTECTED]> >> wrote: >> >> >> > Thought? This is obviously just a sketch... but I >> haven't >> > seen a this done before as far as the failover >> solution >> > with rsync and thought it might work pretty well. >> >> rsync sucks for large numbers of files/directories. It >> has to build an >> in-memory tree before it even starts syncing. >> >> what would be 'nice' to see is something built inside of >> cyrus to handle >> multiple backends but that's a pretty complicated bit of >> beast. (no i'm >> not volunteering ;) ) > > There has been some discussion lately about software > solutions to provide > redundancy, but what about buying redundant hardware? > This may be cheaper > and more reliable in the long run anyways. > > It is not hard to find fully redandunt disk arrays > (usually in the context > of SANs, but a full SAN environment is not required). A > few examples I've > come across: Sun T3 Enterprise Pairs, Dell/EMC > Cx300/500/700. > > That pushes the point of failure out to the server (or > backend server in a > Murder configuration). If a server fails for some reason, > you could have > a backup server available (also in the SAN, or manually > connected at the > time of failure) that mounts the Cyrus partition and > carries on. > > An additional benefit is that these higher end disk arrays > also typically > have much better performance. > > With all of that said, I'm currently running 35,000 > mailboxes on a single > Dell 2650 with an external SCSI disk array configured as > RAID 0+1 > (stripe/mirror). Mail relaying is handled by separate > servers, so all > this box does is IMAP and LMTP delivery. > > We use Sun's T3 Enterprise Pairs for user home directories > and have been > very happy with the performance and reliability (in > conjunction with > Veritas Volume Manager and Veritas File System). However, > the Dell/EMC > solutions are much cheaper and appear to offer the same > levels of > reliability. > > Andy > > --- > Cyrus Home Page: http://asg.web.cmu.edu/cyrus > Cyrus Wiki/FAQ: http://cyruswiki.andrew.cmu.edu > List Archives/Info: > http://asg.web.cmu.edu/cyrus/mailing-list.html > > --- Cyrus Home Page: http://asg.web.cmu.edu/cyrus Cyrus Wiki/FAQ: http://cyruswiki.andrew.cmu.edu List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html
