EMC NetWorker discussion <NETWORKER AT LISTSERV.TEMPLE DOT EDU> wrote on 
05/29/2008 11:07:12 AM:

> 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. 

Since you do backups much more often than restores (hopefully), doing this 
means that you have a tape drive sitting idle for the majority of the 
time, waiting in case you need to do a restore. Seems like a waste of 
resources to me ...

> 
> (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
> > 
> > To sign off this list, send email to listserv AT listserv.temple DOT edu and
> > type "signoff networker" in the body of the email. Please write to
> > networker-request AT listserv.temple DOT edu if you have any problems with
> > this
> > list. You can access the archives at
> > http://listserv.temple.edu/archives/networker.html or
> > via RSS at http://listserv.temple.edu/cgi-bin/wa?RSS&L=NETWORKER
> > 
> > To sign off this list, send email to listserv AT listserv.temple DOT edu and
> > type "signoff networker" in the body of the email. Please write to
> > networker-request AT listserv.temple DOT edu if you have any problems with
> > this list. You can access the archives at
> > http://listserv.temple.edu/archives/networker.html or
> > via RSS at http://listserv.temple.edu/cgi-bin/wa?RSS&L=NETWORKER
> 
> To sign off this list, send email to listserv AT listserv.temple DOT edu 
> and type "signoff networker" in the body of the email. Please write 
> to networker-request AT listserv.temple DOT edu if you have any problems 
> with this list. You can access the archives at http://listserv.
> temple.edu/archives/networker.html or
> via RSS at http://listserv.temple.edu/cgi-bin/wa?RSS&L=NETWORKER

To sign off this list, send email to listserv AT listserv.temple DOT edu and 
type "signoff networker" in the body of the email. Please write to 
networker-request AT listserv.temple DOT edu if you have any problems with this 
list. You can access the archives at 
http://listserv.temple.edu/archives/networker.html or
via RSS at http://listserv.temple.edu/cgi-bin/wa?RSS&L=NETWORKER