George,

Why would you want to specify more than one nsrjb command if the
end result would be the same with one?  (this is more or less a
rhetorical statement than a question)

Actually from a code perspective your idea of launching multiple
nsrjb commands doesn't follow "jukebox max parallelism".  I have
not tested this but I would bet if you set "jukebox max parallelism"
to 1 and kicked off the following it would use both drives:

nsrjb -I -f /dev/rmt1 -S 1
nsrjb -I -f /dev/rmt2 -S 2

In other words we won't explicitly stop you from using all of
the drives.  However, if you let NetWorker manage things by
itself (ie. one nsrjb command and you don't specifiy devices)
the jukebox max parallelism will be followed.

For all of the free advice I gave you today please test the
above theory and report back to the list.  Otherwise you owe me
about $200 dollars.

Thanks,

Carston

-----Original Message-----
From: George Sinclair [mailto:George.Sinclair AT noaa DOT gov]
Sent: Friday, March 07, 2003 2:51 PM
To: Carston Locher
Cc: Legato NetWorker discussion
Subject: Re: [Networker] max parallelism for a jukebox


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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