"ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU> wrote on 01/07/2009
09:24:15 AM:

> hi, just 2 quick questions :
>
> - what's your RESOURCEUTILIZATION parameter value ?
> - what's your MAX_NUM_MP allowed parameter value ?
>

RESOURCEUTIL is not specified, so it's at default.
MAX_NUM_MP on the node is 4.



>
> 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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>
>
> --
>
> Joan Crawford  - "I, Joan Crawford, I believe in the dollar.
> Everything I earn, I spend."