On Tue, 6 Apr 2004, Gary J Jasionowicz wrote:

>Hi all,
>
>I have been working with legato support for the past month or so with no
>luck so I am going to see if anyone else has seen this.  First here is my
>enviroment...
>
>Networker 7.1.1 running on AIX 5.1
>An IBM3583 Library with 4 LTO-2 Tape Drives attached via Fibre and across
>the SAN
>
>The jukebox parrellism is set to 4

>One last thing, legato had me change the jukebox parrellism to 2 saying
>that by doing this it would limit legato to only running two nsrjb commands
>but even after changing it, legato kicked off 4 nsrjb commands and hung
>once the backup started.  Does anyone know what the jukebox parrellism
>actually does?

Regarding jukebox max parallelism, The documentation says "determine the
number of simultaneous operatins in a single nsrjb process." which
typically applies only to the inventory and labeling processes. You might
want to call back to LEGATO's tech support and ask them how their
recommendation to drop the parellism for your jukebox reconciles with what
their documentation says about this setting because their recommendation
makes no sense as far as I can see, assuming you related the
recommendation accurately in your message. The typical recommendation is
to set the jukebox max parellism field to one less than the max number of
tape drives in the jukebox.

In your situation, the typical setting should be three, but even at four,
your nsrjb processes should not hang. Than again, try setting the jukebox
max parellism to one and see what happens.  It is possible that your tape
library might not be able to handle more than one operation at a time.
This might also be a setting in the tape library's firmware.

Just out of curiosity, when you experience these nsrjb hangs, are you able
to do things such as "nsrjb -C" or "mminfo -m" on your NetWorker server?
Do those processes also hang?

You also did not identify what hardware you use for your NetWorker server.
If the OS is some Unix type of OS, can you see what the system load is via
"top" and what the resource utilization, esp. memory is? How much RAM does
the server have? What about its CPU(s)?  Does /nsr/logs/deamon.log show
any strange events?

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