As it was explained to me, if you have 5 drives (for example only) you
will want this setting at 4 - that way you will always have one free
drive in case you need to do a restore and won't have to abort other
backups. 

(Please correct me if this is not right - I've not verified it with the
Manual, but it seems to make sense so have not questioned/touched it).

Regards,
jamie

> -----Original Message-----
> From: EMC NetWorker discussion [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU]
> On Behalf Of Teresa Biehler
> Sent: Thursday, May 29, 2008 10:21 AM
> To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
> Subject: Re: [Networker] Fw: [Networker] Parallelism of "backup clone"
> pool devices?
> 
> The "max parallelism" set to 4 seems fishy to me.  If you want 5 jobs
> to
> run, doesn't this need to be increased to at least 5?
> 
> -Teresa
> 
> -----Original Message-----
> From: EMC NetWorker discussion [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU]
> On
> Behalf Of MIchael Leone
> Sent: Wednesday, May 28, 2008 11:54 PM
> To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
> Subject: [Networker] Fw: [Networker] Parallelism of "backup clone"
pool
> devices?
> 
> Does anyone have any ideas about this?
> 
> >I know I'm missing something simple here ... I have a number of jobs
> >that
> >are clone jobs. So I have a tape library with 4 drives, all of which
> >are
> >defined as devices for a media pool that is a "backup clone" pool.
> >
> >I've noticed that it seems that each backup clone job will wait until
> >
> >there is a free tape drive, before writing. For example: I have JOB
> >1, 2,
> >3, 4, 5 - all are clone jobs, defined to use AFTD disk devices.
> >Assuming
> >that all finish writing to the AFTD devices at approximately the same
> >
> >time, JOB 1,2,3,4 will each use one of the 4 tape drives to write to,
> >and
> >JOB 5 will wait until a running job finishes, before writing to the
> >tape.
> >This is *not* the case with my other library, which has 4 drives, all
> >
> >defined as part of a media pool that is *not* a backup pool.
> >Consequently,
> >all 5 of those jobs will write to the 4 tape drives at once - i.e.,
> >one of
> >those jobs will be servicing 2 groups at once.
> >
> >What setting am I missing, in order for my backup clone tape drives
> >to
> >service multiple sessions/jobs at once? I have "Max Parallelism" set
> >on
> >the library to 4. Where else would I look? Or can a device that is in
> >a
> >"backup clone" media pool not be used by multiple sessions/groups at
> >one
> >time?
> >
> >Thanks
> 
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