Mirroring saved my butt once - I lost the primary disk - I replaced the disk
and with the help of Kelly Lipp at SSSI we restored the server from the
mirrored volume - and was well in under a few hours.

Ron James
Network Management Specialist
Premiere Conferencing

                -----Original Message-----
                From:   Reinhard Mersch [mailto:mersch AT UNI-MUENSTER DOT DE]
                Sent:   Wednesday, April 21, 1999 5:44 AM
                To:     ADSM-L AT VM.MARIST DOT EDU
                Subject:        DB mirroring vs. RAID

                Hi,

                again I am struggling with my ever growing ADSM DB, not
knowing where to
                get the additional disk space I need. An option would be, to
give up DB
                mirroring and rely on RAID5 instead.

                Since RAID5 protects against media/hardware failures, are
there other
                threats, DB mirroring protects against and RAID5 does not?
There has been
                discussion on this in August 98 and Andy Raibeck mentioned
partial page
                writes. But how probable are they? Has anybody out there
ever been in a
                situation where DB mirroring (would have) helped and RAID5
(would have)
                not?

                Regards

                --
                Reinhard Mersch                        Westfaelische
Wilhelms-Universitaet
                Zentrum fuer Informationsverarbeitung - ehemals
Universitaetsrechenzentrum
                Roentgenstrasse 9-13, D-48149 Muenster, Germany      Tel:
+49(251)83-31583
                E-Mail: mersch AT uni-muenster DOT de                       Fax:
+49(251)83-31653