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 <rrho...@firstenergycorp.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? > > > ----------------------------------------- > The information contained in this message is intended only for the > personal and confidential use of the recipient(s) named above. If > the reader of this message is not the intended recipient or an > agent responsible for delivering it to the intended recipient, you > are hereby notified that you have received this document in error > and that any review, dissemination, distribution, or copying of > this message is strictly prohibited. If you have received this > communication in error, please notify us immediately, and delete > the original message. > -- Joan Crawford - "I, Joan Crawford, I believe in the dollar. Everything I earn, I spend."
