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.
