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RMAN backups are slow with TSM

Liron AmitziJan 19 2012 — edited Feb 8 2012

Hi,
I encountered a problem using RMAN with TSM to backup a database. It seems that the RMAN channel doesn't use the entire bandwidth to the TSM (or whatever) and is idle most of the time. This makes the database backup really slow.
As a comparison, we backup also filesystem and SQL Server, they both use very few channels and each channel backup about X5 more data per second than Oracle. For example, SQL Server uses 5 channels to the TSM, and we get a total of around 100MB/s. When we configure Oracle to backup using 5 channels we get about 20MB/s and we see that the SQL Server is writing to the TSM all the time while Oracle is idle a large portion of the time.

Any ideas? Known configuration issues?
I hope I'm clear about the problem.

Thanks,
Liron

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Locked on Mar 7 2012

Added on Jan 19 2012

#performance-availability, #recovery-manager-rman

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