RMAN backups are slow with TSM

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

Hi,
Thanks for everybody for your responses, I'll try to sum the answers here:
1. Yes, we backup the filesystem, and everything works fine. The problem is only with RMAN backups
2. Resources are not an issue, it happens on strong and weak servers (and several O/S as well)
3. Database versions are not the issue, it happens on 10.2 as well as 11.2
My feeling is that this has something to do with the integration, either oracle setting or TSM setting, but I can't be sure until I solve this.
For those of you who backup with TSM, did you notice that filesystem / SQL Servers are being backed up faster? Did you check the Oracle wait events and TSM status while you run the backup?
Thanks
BTW Girish, great comment, I wish I had all the answers... :)

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