High availability email server...

[John Madden]

> Sorry, please bear with my ignorance, I'm not very informed about NFS,
> but what's wrong with locking against a real block device?

NFS is a file sharing protocol that doesn't provide full locking
semantics the way block devices do.

> There are file systems like GFS that have been written for that, even if
> they are pretty CPU and I/O intensive (I use it for multimedia sharing -
> a lot a lot of images that needs to be shared across 4 nodes having
> Apache to serve them).

GFS is a *cluster* filesystem.  We're talking about high availability
here, not clustering.  GFS could certainly be used in this case, but
would be overkill.

John




-- 
John Madden
Sr. UNIX Systems Engineer
Ivy Tech Community College of Indiana
jmadden at ivytech.edu