I got bit hard this morning and I am looking for a solution. I have been
slowly getting our email system up to snuff moving from a pair of
servers to two gateway AV scanners, three vpopmail toasters, and two
outbound qmail servers. The toasters mount the Maildirs via NFS, the AV
scanners talk to the toasters via milter-ahead, and the NFS mailstore
hosts MySQL for vpopmail.
I've just gotten load balancers installed and moved the outbound traffic
there first, getting a good load test on vpopmaild for smtp-auth. I had
promised to provide the scripts and now I am actually seeing how well
Problems arose when my NFS server went stupid this morning and all mail
stopped. AV scanners couldn't verify mailboxes because the toasters
couldn't see MySQL, the outbound servers couldn't do smtp-auth for the
same reason. It wouldn't have mattered anyway because my Maildirs were
offline. NFS is my single point of failure, even though it is RAID5,
dual NIC, dual power supply (SUN Enterprise 250), it went offline.
I need to fix that, I can cluster MySQL but I am looking for ways to
have either a clustered NFS with rw permissions and appropriate
locking/syncing, or NFS failover from the toasters.
I am looking at GFS and active/active NFS and HaNFS. Has anyone gone
down this path yet?
Three years now I've asked Google why they don't have a
logo change for Memorial Day. Why do they choose to do logos
for other non-international holidays, but nothing for
Maybe they forgot who made that choice possible.