ADSM-L

Re: MVS-Server goes to sleep when waiting for a tape

1997-01-14 04:07:47
Subject: Re: MVS-Server goes to sleep when waiting for a tape
From: CC Masters <cmaster1 AT TUELECTRIC DOT COM>
Date: Tue, 14 Jan 1997 09:07:47 +0000
I believe this is addressed in V2.1.10

Matthias Brasch wrote:
>
> High to all ADSM'ers,
>
> I'm running ADSM-MVS-Server V2.1.09 and the following effect
> appears when I'm running an 'backup storage pool' :
> The tapes from the pool 'CTAPE_COLLOCATION' are to be copied
> into the backup storage pool 'MTAPE_COPYPOOL'.
> This works fine until the tape on device MTAPE will be full
> and ADSM needs the next scratch tape to be mounted.
> If there is no free device for the mount of the new tape
> the MVS-message 'IEF238D ... Reply device name...' appears.
> This message is answered with 'reply xx,wait' and so the
> next message 'IEF238D wait requested ...' appears.
> This message is answered with 'nohold'.
> This is the moment when ADSM goes to sleep until anything happens
> with the tapes ( another Task like dfhsm frees one device ).
> The problem is that the tape which is already mounted on MTAPE
> and which is full will not be dismounted until ADSM has an free
> device to mount another tape.
> This is an deadlock situation and is an ADSM-error I think.
> The problem is that not only the backup task hangs but all
> adsm processing stops. Even the client-sessions and admi-sessions
> are hanging.
> ADSM should dismount the full tape immediately and not wait
> for the next tape mounted on another device.
> I know about the 'mount-retention' parameter and set this to '0'.
>
> Anyone any  Idea ?
>
> Best regards,
> Matthias Brasch, HEW-Hamburg, M_Brasch AT compuserve DOT com
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