> -----Original Message-----
> From: ewilts at ewilts.org [mailto:ewilts at comcast.net] 

> 
> I apologize for top-posting, but this web client really sucketh...

Bah, I'm a top-posting vigilante, even though I come from a usenet
background.
;o)

> You'll note in my posting that I am  having performance 
> problems *destaging*.  These files are typically large.  As I 
> said, I've set the fragment size to unlimited.

That why I mentioned it when Simon asked "What sort of files are backed
up? Large or a lot of small files?"

> I obviously don't have a network problem since I'm going 
> directly from a local SAN-attached disk to a SAN-attached 
> tape drive.  I can dd from the DSSU at 140-170MB/sec which is 
> about what I'd expect on a 2Gbps FC port.

DD to where? Have you tried DD to a local (non-SAN) device, like a local
filesystem that is either local to the box, or at least direct connected
FC, but not connected via the same HBA?
Have you tried tar/cpio from DSSU direct to a tape? Are your DSSU and
tape drive connected via the same HBA? Different HBA? Different port on
same HBA?

Is disk connected to a HBA in a 66MHz slot, and tape connect to a HBA in
a 33MHz slot?

Obviously, a tar direct to tape will give you a good idea of the path
throughput without involving Netbackup.


Paul
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