Hi Campbell.

Please let me know what you dig up. We too are using EMC and ADSM. There is some
talk of using EDM, but certainly not as a total solution. I personally am not
that familiar with EDM, but I can give you  about 1.4 cents worth of comments.

If we do use EDM, it would be for highly critical applications in case of
Disaster. EDM would mirror the disks partitions. To make it worth while is a
disaster, it would get mirrored across the WAN. Unless you have a huge bandwidth
on your WAN that's not being used for anything else, you can see what
restriction #1 is. Also, I believe, since EDM mirrors the partitions, I do not
see any way of recovering single files: talk to EMC about this.

Last thing. If you are using EDM to protect a database, then what happens if the
application itself destroys or corrupts the data? Then the corruption is mirrors
by EDM! Since you have versioning control on ADSM, you can restore the data from
a time when you know the data was still good.

These comments are based on pieces of conversations that I picked up with a
collegue that knows a good deal about EMC. If you have specific questions or
concerns, let me know and perhaps I can get some answers for you from him.





From: Campbell Esplin <Campbell AT KINGSLEY.CO DOT ZA> on 07/06/98 06:00 PM GMT

Please respond to "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>

To:   ADSM-L AT VM.MARIST DOT EDU
cc:    (bcc: ADSM)
Subject:  EMC's Enterprise Data Manager




Folks, give it to me!
I need all possible arguments to advise my customer on the best approach to
follow. The options are ADSM or EDM (heavy preference held by the customer
for the latter). Knowing ADSM and not knowing EDM leaves me somewhat
flatfooted. Anyone out there that has any experience with EDM, STK
Libraries, EMC 3440's and the "PIPE" to the dedicated MP processor - good
or bad -  please, if u don't mind tell me more about it.If u want to keep
it confidential mail directly to me at the given EMAIL address.
I sit with 1.7TB on a 3440 EMC disk unit with 5 large NT Servers coupled
via fiber to the 3440. An EMC controller sucks off the data, apparently,
whilst the servers are online, off to the dedicated EDM server with the STK
library. Any info on this controller will be helpfull.
Regards
Campbell Esplin
campbell AT kingsley.co DOT za
http://www.excal.co.za