WOW! I guess I was pretty ignorant of the power of that command! It
worked just like you said. Here's a question, though. Let's suppose
instead of doing this:

nsrjb -IEv -S 1-6

to launch an inventory in parellel across all 2 drives, I instead did
this:

nsrjb -I -f /dev/rmt1 -S 1-3 &
nsrjb -I -f /dev/rmt2 -S 4-6 &

to launch a separate nsrjb process per drive. Would this not accomplish
the same thing in the same amount of time? I guess I thought this was
what the max parellelism value was for. To allow you to do things like
this. I guess it allows you to do both what you were referring to and
what I mentioned, too?

George

Carston Locher wrote:
>
> George,
>
> Set the "jukebox max parallelism" to "# of drives" and then do
> the following command:
>
> nsrjb -IEv
>
> It will use all available tape drives with one nsrjb command.
>
> You are correct that through the GUI you must select a device.
> However, that has never been required from the command line.
>
> Thanks,
>
> Carston
>
> -----Original Message-----
> From: George Sinclair [mailto:George.Sinclair AT noaa DOT gov]
> Sent: Friday, March 07, 2003 1:11 PM
> To: Legato NetWorker discussion; Carston Locher
> Subject: Re: [Networker] max parallelism for a jukebox
>
> I'm a little confused, and I want to make sure I'm clear about this. You
> said:
>
> "For instance if you set this value
> > to 4 and kicked off one nsrjb operation all of the 4 tape drives
> > would be used (if you were performing operations on 4 or more slots)."
>
> When I run an inventory operation, I have to indicate which device to
> use regardless of whether I'm running in the window or the command line.
> It shouldn't matter how many slots I'm inventorying. NetWorker will only
> use the one device provided. It will never use the other devices unless
> I run inventories there, too. I've never seen NetWorker use any device
> other than the one you chose regardless of how many slots you're
> inventorying and or what the value of t he max parallelism is. Didn't
> you mean to say that all of the 4 tape drives would be used if you were
> performing operations from 4 separate nsrjb processes, e.g. 4
> simultaneous inventory operations?
>
> George
>
> Carston Locher wrote:
> >
> > Jim,
> >
> > I want to clarify things because from this statement I can
> > see you have confusion and are being misdirected.
> >
> > The "jukebox max parallelism" has nothing to do with backup/recover.
> > It only has to do with nsrjb and inventory/label.  It is the
> > number of devices nsrjb will use to perform these particular
> > operations (backup/recover).  The default setting by NetWorker
> > is "# of drives -1 (in your case would be 3).  This would allow
> > inventory/label to use 3 devices and one would be left in reserve
> > for backups/restores.  You can change the value to 4 so all drives
> > would be used if you like.  There is no value in changing the
> > max parallelism to be greater than the # of drives in your jukebox.
> >
> > Davina is actually slightly incorrect in that it is not the #
> > of nsrjb processes allowed.  For instance if you set this value
> > to 4 and kicked off one nsrjb operation all of the 4 tape drives
> > would be used (if you were performing operations on 4 or more slots).
> >
> > Please give me the name of your consultant.  You don't have to
> > send it to the group.  I just want to make sure the person gets
> > more education before they are allowed to talk to any more
> > customers.
> >
> > Thanks,
> >
> > Carston
> >
> > -----Original Message-----
> > From: Legato NetWorker discussion
> > [mailto:NETWORKER AT LISTMAIL.TEMPLE DOT EDU]On Behalf Of Jim Lane
> > Sent: Friday, March 07, 2003 5:35 AM
> > To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
> > Subject: [Networker] max parallelism for a jukebox
> >
> > I've just read a couple of posts on this from yesterday and I'm
> > confused. the replies tended to suggest that this value should be
> > related in some way to the number of drives in the jukebox that
> > Networker should use for backup, as against leave free for ad hoc usage,
> > restores etc. I was told by the Legato consultant that this value is the
> > maximum number of saveset streams that can be directed to all the drives
> > in the jukebox at once. on that basis this number is supposed to be set
> > at or above the sum of the "target sessions" for all the tape drives. at
> > least that's what I was told. on that theory the Legato guy set the "max
> > parallelism" in my 4-drive STK 9710 to 32. now I'm worried. who's right
> > here? am I over-specifying this value?
> >
> > Jim Lane
> > Sr. Technical Consultant
> > Network Services
> > Toronto Hydro
> > office: (416)-542-2820
> > cell: (416)-896-8576
> >
> > --
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