Networker

Re: [Networker] Max parallelism value for jukebox?

2003-03-07 14:10:49
Subject: Re: [Networker] Max parallelism value for jukebox?
From: Carston Locher <clocher AT LEGATO DOT COM>
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
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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