Comment # 11 on bug 1078552 from Josef Reidinger

JFS drop is old feature number 2105 ( sorry private only as it is really
ancient ).

Quoting from it (not all info is up to date, consider that it is 11 years old,
so it is dropped for long time):

Drop JFS filesystem.

We have too many filesystems. We support 4 full-featured journalled 
local filesystems (ext3, reiserfs3, XFS and JFS) currently and 
new ones are appearing (reiser4, ext4?).

ext3 and reiserfs3 both are solid filesystems with good performance. 
For special applications, you might need better scalability or 
special features support (e.g. DMAPI). JFS and XFS offer somewhat 
more here (than ext3 or reiserfs3). However, XFS performs a bit 
better, gets much more testing and is well supported from sgi. 
JFS has more issues and the support from IBM is not as good.

Thus, JFS should be dropped from the list of filesystems offered 
in the SLES10 installer and should be marked unsupported (unless 
IBM commits to eXternally supporting it).

It should be marked deprecated in the release notes of SLES10 
and dropped for SLES11.

Note that SUSE Linux 9.3 already does not support JFS in YaST and 
mentions this in the release notes.