We once experienced such a problem with DLT drives.
After endless Networker debugging it turned out to be a HP/UX problem.
Applying the current HP fixes solved for us the performance issues.
Unfortunately I do not have the specific fixes details.
HTH,
        Itzik

> -----Original Message-----
> From: Saunderson,Michael Robert [mailto:SAUNDEMR AT APCI DOT COM]
> Sent: Wednesday, August 20, 2003 18:29
> To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
> Subject: [Networker] 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.
> 
> +
> 
> --
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