aix .oracle rman backup very solwly about 500k/s

mugen

hi,dear all,pls help me,

rman backup very solwly about 500k/s
aix 4.3.3, jfs filesystem. target oracle 9205,rman  catalog oracle 9201
a whole night only backup 20G data,
today, i visit metalink.oracle.com.
it says it is a kind of bug.
does anybody make sense of this situation?
how can i do it?



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from metalink.oracle.com

Note:284013.1
Subject: RMAN backup is much slower after applying 9.2.0.5 patchset.
Type: PROBLEM
Status: PUBLISHED
Content Type: TEXT/X-HTML
Creation Date: 28-SEP-2004
Last Revision Date: 15-APR-2005




The information in this document applies to:
Oracle Server - Enterprise Edition - Version: 9.2.0.5 to 9.2.0.5
AIX Based Systems (32-bit)

Symptoms
RMAN backup is slow after upgrading from 9.2.0.x to 9.2.0.5

The input files are on JFS2 filesystem.
Cause
The Direct I/O is not supported on JFS2 filesystems in 9.2.0.5.Best performance on JFS2 filesystems is obtained when they are mounted with Concurrent I/O.
Fix
For best performance the customer should put the database and RMAN
files on a seperate filesystem and have that filesystem mounted with
Concurrent I/O enabled.

Bug 3850840 with same issue in JFS filesystem is in progress .
References
Bug 3575573 - Rman Backup Slower After 9.2.0.5 Patchset Is Applied
Bug 3850840 - 9205 Backup With Rman Slow On Jfs Filesystem