I am using JFS for all of my root filesystems on the Linux servers (200+).
I am also using JFS for the database servers data files [ ~40 servers ],
which are all .5TB - 2TB. These are running SAP. Never had a problem
with Oracle support, SAP support or Novell support.

These are all connected on machines from 2CPUs - 16CPUs running SLES9.
Some are pretty impressive and I find the best performance with jfs, I did
some quick benchmarks before a data migration on an IBM DS6800 using
multipathd and 4x2G fiber connection.  Results are here:
http://www.techyblog.com/2006/01/linux-26-filesystem-benchmarks.html



Nick