Re: [Networker] 7.3.2 parallelism/target sessions not functioning correc

I suspect the delayed start of incremental backups is normal behavior. When
you do a full, NetWorker knows it has to back up everything so the tape
writes start as soon as an eligible tape is mounted. When you do an
incremental or differential, NetWorker has to "walk" the file systems to
determine what to back up. That probably accounts for the five minutes or so
before tape writing begins.

Conrad Macina
Pfizer, Inc.


On Mon, 18 Dec 2006 16:16:28 +0000, mark wragge <mark_t_wragge AT YAHOO DOT IE> 
wrote:

>I have just discovered that the parallelism settings work on Full backups.
It is only on incremental backups that they "appear" not to work. The
incremental backups take a long time to start but the data streams take
control of one of the target sessions on the tape device.
>
>  So I presume that the incremental data streams are started by legato,
allocated a target session and then take at least 5 minute to start.
Eventually one of the tape devices has allocated all 6 target sessions so it
moves onto the next tape device. This is why there could be three jobs
running on one tape device and then it will start two jobs on the next tape
device.
>
>  I have never noticed this behaviour before on incremental backups. Any
idea why this is happening?
>
>
>
>"Faidherbe, Thierry" <Thierry.Faidherbe AT hp DOT com> wrote:
>  Look after "Question on drive target sessions?" round mid-end nov 2006.
>
>Happy reading,
>
>Th
>
>
>
>
>
>Kind regards - Bien cordialement - Vriendelijke groeten,
>
>Thierry FAIDHERBE
>
>HP Services - Storage Division
>Tru64 Unix and Legato Enterprise Backup Solutions Consultant
>
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>-----Original Message-----
>From: EMC NetWorker discussion [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU] On
>Behalf Of mark wragge
>Sent: Monday, December 18, 2006 3:38 PM
>To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
>Subject: Re: [Networker] 7.3.2 parallelism/target sessions not
>functioning correctly - is this a known issue?
>
>Ok - can you give me a hint - I can;t find a reference to this problem
>but need to do so urgently. What word should i search for in the
>archives.
>
>This is not the same problem as the parallelism being reduced to the
>lowest number of target sessions on any single device.
>
>@OSTI.GOV> wrote:
>This has been discussed and rather recently at that. Check the
>archives.
>
>
>Patti Clark
>Unix System Administrator - RHCT
>Office of Scientific and Technical Information
>
>-----Original Message-----
>From: EMC NetWorker discussion [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU] On
>Behalf Of mark wragge
>Sent: Monday, December 18, 2006 7:53 AM
>To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
>Subject: [Networker] 7.3.2 parallelism/target sessions not functioning
>correctly - is this a known issue?
>
>I have a win2003 7.3.2 server that I am convinced I have setup correctly
>in terms of parallelism settings and target sessions. The number of data
>streams I am seeing is not coresponding to the settings. The number of
>data streams I am seeing is not consistent - it can range from 3 to 6
>spread unevenly or evenly across my two tape devices.
>
>Some times it appears that there is a delay in starting the clients
>backup streams. For example, there could be 5 streams backing up and 6
>more clients waiting to backup with the 'contacting client' message in
>the group details but as the data streams complete the next stream does
>not start. Then when all the streams complete the next set of streams
>starts to backup about 4 minutes later.
>
>Is this an issue that anyone else is having or aware of in a 7.3.2
>win2003 environment.
>
>My configuration details are:
>Server Parallelism: 14
>Tape device 0 target sessions: 6
>Tape device 1 target sessions: 6
>Library Parallelism: 2 (i have two tape devices)
>Client Paralleilism: 4 (10 clients)
>
>//Mark
>
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Re: [Networker] 7.3.2 parallelism/target sessions not functioning correctly - Incremental backups only!!
