High availability email server...

John Madden jmadden at ivytech.edu
Fri Jul 28 16:18:23 EDT 2006

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

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