What does the meaning of this error in udump?

I solved my RMAN backup slowness problem. But I noticed that during the backup process, it generated an error file in udump as
$ more mybk_ora_651394.trc
/oracleapp/admin/mybk/udump/mybk_ora_651394.trc
Oracle Database 10g Release 10.2.0.1.0 - 64bit Production
ORACLE_HOME = /oracleapp/oracle/product/10.2.0/db_1
System name: AIX
Node name: mybk
Release: 3
Version: 5
Machine: ##########
Instance name: mybk
Redo thread mounted by this instance: 1
Oracle process number: 34
Unix process pid: 651394, image: oracle@mybk (TNS V1-V3)
*** 2007-01-19 16:30:15.302
*** ACTION NAME:(0000037 STARTED111) 2007-01-19 16:30:15.285
*** MODULE NAME:(backup incr datafile) 2007-01-19 16:30:15.285
*** SERVICE NAME:(SYS$USERS) 2007-01-19 16:30:15.285
*** SESSION ID:(539.666) 2007-01-19 16:30:15.285
*** 2007-01-19 16:30:25.862
*** ACTION NAME:(0000063 STARTED111) 2007-01-19 16:30:25.862
*** MODULE NAME:(backup archivelog) 2007-01-19 16:30:25.862
What does it mean? Every "control autobackup" will produce such error file in udump.
Message was edited by:
user508054

I think I need more investigation about this. I found two papers last night:
http://www-128.ibm.com/developerworks/linux/linux390/perf/tuning_rec_database_OracleRec.html
http://www.netapp.com/library/tr/3408.pdf
with a previous online paper mentioning to alter the maxservers of aio0. Although this is an alternative, I tried to increase the value to 300 (500 at this moment) and it does not seem to work. On other hand, with change of the disk_asynch_io, it will hinder the exp/imp pump. So I really don´t know what to say.
Apparently the disk_asynch_io needs to be FALSE in order to speed up the backup. just verified again, even with my maxserver=500 did not help.
Message was edited by:
user508054
Use the expdp to dump my db with the asynch_io in FALSE. It looks OK, no delay.
Message was edited by:
user508054

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