Re: [Networker] Max parallelism value for jukebox?

John,

You wouldn't get any errors as the jobs don't fail they just sit
waiting for an available device.  You'd see pending requests for
the tapes needed for backup or recover.  You'd keep getting those
pending requests until a device becomes available and the tapes
are mounted.

Thanks,

Carston

-----Original Message-----
From: nsrd nsrexecd [mailto:nsrdude AT hotmail DOT com]
Sent: Friday, March 07, 2003 10:08 AM
To: clocher AT legato DOT com; NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Subject: RE: [Networker] Max parallelism value for jukebox?


Carston , what kind of warning errors would I get?  device busy errors?



John Hansen









>From: "Carston Locher" <clocher AT legato DOT com>
>To: "Legato NetWorker discussion" <NETWORKER AT LISTMAIL.TEMPLE DOT EDU>,   
>"nsrd
>nsrexecd" <nsrdude AT HOTMAIL DOT COM>
>Subject: RE: [Networker] Max parallelism value for jukebox?
>Date: Fri, 7 Mar 2003 08:39:12 -0800
>
>John,
>
>If you set the value to 4 nsrjb would use all four drives
>for inventory/label.  If a backup/recover job was started
>they would queue up waiting for the nsrjb operation to
>finish.
>
>Thanks,
>
>Carston
>
>-----Original Message-----
>From: Legato NetWorker discussion
>[mailto:NETWORKER AT LISTMAIL.TEMPLE DOT EDU]On Behalf Of nsrd nsrexecd
>Sent: Friday, March 07, 2003 5:16 AM
>To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
>Subject: Re: [Networker] Max parallelism value for jukebox?
>
>
>In another words assuming you have for tape drives, a good value would be
>max parrallelism = 3
>
>So nsrjb can label 3 tapes simultaneously, (ideal for batch labeling) and
>reserve 1 tape drive for backup/recovery.
>
>I am not sure what would happen if you put max parrallelsm to 4 ?
>
>
>Does anyone know ?
>
>
>John Hansen
>Estab Engineering
>
>
>
>
>
>
>
> >From: Carston Locher <clocher AT LEGATO DOT COM>
> >Reply-To: Legato NetWorker discussion <NETWORKER AT LISTMAIL.TEMPLE DOT EDU>,
> >         Carston Locher <clocher AT LEGATO DOT COM>
> >To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
> >Subject: Re: [Networker] Max parallelism value for jukebox?
> >Date: Thu, 6 Mar 2003 15:40:16 -0800
> >
> >George,
> >
> >The jukebox max parallelism is the number of drives in the jukebox
> >that nsrjb will use.  In other words if you have a jukebox with
> >two drives and you have the max parallelism set to 1 it will only
> >use 1 drive when you do an inventory (label, etc).  If you set
> >the value to 2 it will use both tape drives.
> >
> >NetWorker is coded to do (n -1) for the jukebox parallelism (n being
> >number of drives in jukebox).  The reason for this is the theory
> >that you could start for instance an inventory operation and you
> >would always have 1 tape drive not being used which could be used
> >for backups/recovers.  Otherwise the backups/recovers would have
> >to wait for the inventory/label operation to complete before they
> >could start.
> >
> >Thanks,
> >
> >Carston
> >
> >-----Original Message-----
> >From: Legato NetWorker discussion
> >[mailto:NETWORKER AT LISTMAIL.TEMPLE DOT EDU]On Behalf Of George Sinclair
> >Sent: Thursday, March 06, 2003 3:01 PM
> >To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
> >Subject: [Networker] Max parallelism value for jukebox?
> >
> >
> >Hello,
> >
> >Does anyone have any experience with the max parallelism value for
> >jukeboxes? Here's the deal. We have an ATL P1000 SDTL jukebox with two
> >SDLT drives. The last time I re-configured the jukebox using jbconfig,
> >it ended up with a value of 1 for the parellism, but I thought I
> >remember it being 2 before. We have an older P1000 with 3 DTL7000 drives
> >and its value is 2. This was the value that was assigned by NetWorker
> >when we last ran jbconfig for that guy. We have a Storagetek L80 with 4
> >LTO drives, and NetWorker assigned it a value of 3. I'm wondering if
> >maybe the value should really be 2 on our SDLT library so I changed it.
> >I'm not exactly sure I really understand the purpose of the field value
> >and what I should set it to, but we have been receiving some sporadic
> >Device or resource busy messages on the drives on the SDLT library
> >(reported from NetWorker), and there have been a number of suggestions
> >regarding this, like adjusting the load, unload and sleep values, but I
> >noticed this field and thought maybe this might cause this if not set
> >high enough? Also, does this value affect how many simultaneous
> >inventory operations you can run? It seems like the value could be as
> >high as the number of drives, but maybe my thinking on this is unclear?
> >Maybe it's not that elementary?
> >
> >Would appreciate any advice.
> >
> >Thanks.
> >
> >George
> >
> >--
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