"ADSM: Dist Stor Manager" <ADSM-L@VM.MARIST.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 > <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."
