there's definitely a point of diminishing returns when it comes to 
the MPX value, and above that value your backup speed stops improving 
and you're left with the drop in restore performance...

personally, my rule of thumb for that value is 4.  but like so many 
performance rules of thumb, YMMV.  the best way to determine is via a 
regression test in YOUR environment, rerunning backups at higher and 
higher MPX levels until your aggregate drive write speed plateaus.


At 3:31 PM -0400 4/18/03, Turner, Eric wrote:
Probably a topic that's been discussed many times before.

Anyone have some general guidelines for initial settings of the 
multiplexing attribute within the schedule window of the class?

I have inherited the system and the majority of the classes are set 
across the board with 7 (fulls and incrementals), and the max setting 
of the storage unit properties is at 10.

Backups are completed very well and well within the window , but 
restore times are atrocious for any restores that require a 
significatnt amount of data.   Any suggestions for modifications?   I 
have a feeling these current settings are way off.....

NBU 3.4.1_1 Master/Media
W2K SP3
STK L700
10 Seagate LTO drives
5 San media servers

Thanks!!

ERIC