Have you tuned the TCP/IP parameters?  At least on AIX, the defaults are
only valid for a personal workstation.

>From:  "Saunderson,Michael Robert" <SAUNDEMR AT APCI DOT COM>
>Date:  8/20/03 11:28AM
>Subject:       Strange performance issues since NetWorker upgrade
>
>Hello all,
>
>I'm hoping there's a brain or two that can throw some ideas or light
on the following scenario (sorry if it's a bit long winded):
>
>Up until just over a month ago we were running NetWorker 5.1 on HP-UX
10.20. This system ran backups at good
> speeds, but was highly prone to falling over and NetWorker itself
would often suffer from freezes.
>
>To attempt to solve this (and other support issues), we moved
NetWorker across to newer hardware with the
> /nsr directory stored on striped disks, faster processors, >more
memory, etc. The OS this newer system runs
> is HP-UX 11.0. Following the move to the new system, we have noticed
a significant reduction in the speed of
> data streaming down to the tape drives and as a result many of our
larger backups are failing to complete due
> to lack of time. We have since upgraded to NetWorker 6.1.3, but this
has made no change to the situation.
>
>The new server has identical numbers of SCSI channels and NICs. There
are no apparent network configuration
> issues as the neither the cards nor the switch show any errors. Test
FTPs also run at good speeds. The system.
> also isn't logging any SCSI errors. A local backup of /nsr runs at
very good speed until additional backup streams
> come in across the network.
>
>Our vendor went through all the usual settings such as Parallelism,
Drive Sessions, etc., but all to no avail.
>
>Does anyone have any further ideas where we could start looking?
>
>Many thanks for any thoughts,
>
>Michael Saunderson.

---
Jim McAlarney                                         Huber Engineered
Materials
phone:  404-949-5505                              4401 Northside
Parkway
fax:       404-949-1305                              Suite 600
jmcalarney AT huber DOT com                            Atlanta, GA  30327

--
Note: To sign off this list, send a "signoff networker" command via email
to listserv AT listmail.temple DOT edu or visit the list's Web site at
http://listmail.temple.edu/archives/networker.html where you can
also view and post messages to the list.
=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=