keep in mind that a full disaster recovery is complete with
resoring the Exchange dr and Information store - the Info and Dr always
backup faster than the mailboxes but the mailboxes are a additive giving us
radical restores of individual mailboxes/calendars etc, sorry for the last
speed notification but mail boxes are at a max of 596-999KBsc but the
information store is up around 4000 to 7000?  for 5.5 datacenter 4.5
for windows with 3.4 exchange agent. This is with DLT7000 2003 server 4.5
mp6. Sorry -

-----Original Message-----
From: Drunen van, Marcel
To: veritas-bu AT mailman.eng.auburn DOT edu
Cc: Eric Ljungblad; Ungaro, Matt 
Sent: 4/4/2005 12:26 PM
Subject: RE: [Veritas-bu] Exchange backup performance

All,

Thanks for the reactions. Veritas gave me two hints to determine the
maximum velocity of an Exchange backup; see how fast a Xmerge performs,
and the old trick from the performance guide: dump to a null device.
Once you have determined the maximum speed that bpbkar can read the data
with, no matter what you do, you won't get any more performance without
tweaking Exchange. That is, per stream. Multiple streams can provide
significant gains, but there is a limit to the amount of streams that
can be handled by MAPI. So now I am looking for ways to increase
Exchange performance.

We are using LTO drives, the backups go over a gigabit NIC. Everything
seems to be tweaked normally. It is still Exchange 5.5, that's the
reason why I still want to do bricklevels. No recovery group available,
and the store is a bit to big to keep a complete staqndby recovery
server available.

We are reaching five streams of 1 MB/s each at the moment. Not enough
for streaming, now considering disk staging in order to save the drives.

Regards,

Marcel