hi, just 2 quick questions :

- what's your RESOURCEUTILIZATION parameter value ?
- what's your MAX_NUM_MP allowed parameter value ?


On Wed, Jan 7, 2009 at 3:15 PM, Richard Rhodes
<rrhodes AT firstenergycorp DOT com> wrote:
> Hello,
>
> We are still fairly new to RMAN/TDPO backups, and trying to understand
> behavior.
>
> We have one 10tb database that performs RMAN backups to TSM using one
> tape drive (one channel).  Oracle datafiles are interleaved (not sure of
> the level).
>
> We are now performing a full restore on this database.  The dba allocated
> 4 channels for the restore (4 tape drives).  We started getting session
> timeouts.  It looks like Oracle was asking for aggregate files on different
> channels that in TSM are on the same tape.  This caused tape contention
> and session timeouts. The restore was stopped and changed to a
> single channel.
>
> I've been trying to find info on issues/limitations around  RMAN/TDPO
> restores
>  with multiple channels, but not finding much info.
>
> Questions:
>
> 1)  Does the number of channels on a restore have to be the same or less
> than the number used for the backup?
>
> 2)  Is it even possible to do multi channel restores?  In other words, does
> RMAN have knowledge of the tape volumes so as to not cause
> tape contention across channels?
>
>
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