Larry...

We get asked this question often about whether it's better
to use JFS files or logical volumes for the ADSM DB and log
(and storage pool volumes).  Logical volumes have lower overhead
so they should be more efficient, however, JFS does caching which
helps it perform well.  Our performance group ran various tests
on this prior to shipping the ADSM for AIX server and no
conclusive evidence was found to support one or the other.

So...it's really up to your preference...there appears to be
no performance implications with one or the other.  One other
consideration might be ease of management...JFS files probably
have a slight edge here but SMIT makes management of logical
volumes pretty painless as well.

I tend to use JFS files but I don't make recommendations one
way or the other.

Greg Tevis
ADSM Technical Support