Just to add one point. I agree with Davina's take on this. I believe that
the NetWorkers algorithms are designed to keep the tape drives streaming
where possible, so the most likely drive to exceed target sessions in the
example is the one currently writing at the slowest speed, not the one with
the fewest sessions.

Andrew

-----Original Message-----
From: Davina Treiber [mailto:treiber AT HOTPOP DOT COM]
Sent: 18 March 2003 3:51:AM
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Subject: Re: [Networker] How to reserve a drive in a jukebox?


On Mon, 17 Mar 2003 16:39:33 +0100, Gregory Demilde - System Support
Engineer <Gregory.Demilde AT SUN DOT COM> wrote:

>| Assume target sessions =   4+4+4+1 and  a group with
>| 14 streams starting. I am almost sure the last drive
>| would anyway receive 2 streams, because target
>| sessions is not a borderline, just a guideline.
>
>
>Target sessions values is a bordeline. If NSR does not respect the target
>sessions value then you have a problem.

I don't quite know what you mean by borderline, so I don't know whether or
not I am disagreeing with you. Anyway, target sessions is what it says, a
target rather than a limit. If your server and client parallelism settings
allow it, in the example above there is one more session than the sum of
the target sessions. NetWorker will certainly write this session to one of
the drives, but to the best of my knowledge there is no rule that says
which drive. It is just as likely to be the drive with target=1 as one of
the drives with target=4. One of the drives will exceed the target - which
one is undefined.

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