I definitely recommend using ADSM mirroring, *not* AIX mirroring. One main
reason for this has to do with database volume corruption. If, for some reason,
one of your ADSM DB volumes becomes corrupted, AIX mirroring will pass the
corruption on to the mirrored copy while ADSM may not pass on that corruption.
For example, if ADSM or AIX crashes in the middle of a write to the database,
one of the volumes may be corrupted due to the partial write. With AIX
mirroring, this corruption will be passed to the mirror and you will be in a
database recovery situation. With ADSM mirroring, the other (mirror) volume may
not be corrupted. ADSM could then be started and the ADSM mirroring would
(correctly) resynchronize the mirrored volumes.

Andy Raibeck
ADSM Level 2 Support

        ADSM-L AT VM.MARIST DOT EDU
        01-05-98 10:49 AM
Please respond to ADSM-L AT VM.MARIST DOT EDU @ internet

To: ADSM-L AT VM.MARIST DOT EDU @ internet
cc:
Subject: ADSM mirroring vs. AIX mirroring

I've been browsing through the ADSM archives at Marist and could not find
what I was looking for.  Setting up a new server that has ample space to
replace our old ADSM server.

What are the pros and cons of using ADSM and AIX to mirror the database
and log volumes.  Mainly focusing on differences between using AIX
mirroring and the built-in mirroring in ADSM.

I had considered a RAID configuration, but it seems like that is not such
a hot solution for the database for performance reasons.  Am I wrong?

_______________________________________________________________
Joe Morris  -  morris AT unc DOT edu  -  http://sunsite.unc.edu/morris
Academic Technology and Networks, Development and Eval Services
University of North Carolina at Chapel Hill      PGP by request