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Oracle10g mmnl errors

Greg Hall
Frequent Advisor

Oracle10g mmnl errors

Hi,

my client has a new oracle 10g r2 database on HPUX 11.11. In the database bdump dir this is a .trc file dbname_mmnl_13961.trc. Which contains:

Dump file /u00/app/oracle/admin/PRDCLRTY/bdump/prdclrty_mmnl_13961.trc
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - 64bit Production
With the Partitioning, OLAP and Data Mining options
ORACLE_HOME = /u00/app/oracle/product/10.2.0.1.0
System name: HP-UX
Node name: akldwhp1
Release: B.11.11
Version: U
Machine: 9000/800
Instance name: PRDCLRTY
Redo thread mounted by this instance: 0
Oracle process number: 0
Unix process pid: 13961, image: oracle@akldwhp1

File '/dev/async' not present : errno=2
*** 2005-11-14 04:19:34.764
*** SERVICE NAME:(SYS$BACKGROUND) 2005-11-14 04:19:34.764
*** SESSION ID:(325.1) 2005-11-14 04:19:34.763
ksugetosstat failed: op = pstat_getprocessor, location = slsgetactive ()
*** 2005-11-14 04:19:47.136
ksugetosstat failed: op = pstat_getprocessor, location = slsgetactive ()
*** 2005-11-14 04:20:02.285
ksugetosstat failed: op = pstat_getprocessor, location = slsgetactive ()
*** 2005-11-14 04:20:16.423


- they are working on the /dev/async problem.
- are the ksugetosstat failures related to the /dev/async problem, or are they something else? I suspect the latter as these msgs are being produced every few secs since 0419 Monday.
Any clues would be welcome, I'm a bit lost.

thanks, Greg
Confucious Confused
7 REPLIES
Warren_9
Honored Contributor

Re: Oracle10g mmnl errors

hi,

similar reported in metalink.oracle

https://metalink.oracle.com/metalink/plsql/ml2_documents.showDocument?p_database_id=FOR&p_id=613649.993

This problem happened on oracle8 and it come out again on the 10gR2....!?

GOOD LUCK!
Yogeeraj_1
Honored Contributor

Re: Oracle10g mmnl errors

hi greg!

also refer to metalink notes:
Note.60692.1 ALERT HP-UX Tracefiles reference /dev/async when async i/o not configured

Note.1053060.6 TRACE FILE BEING GENERATED WITH EACH DBWR PROCESS

As the previous post say this error was first reported in Oracle 8i whereby the workaround was:

WORKAROUND
==========
It is possible to workaround the problem by the following means;

If the "/dev/async" device does not exists, then create it.

As the root user:

/sbin/mknod /dev/async c 101 0x0
/usr/bin/chown oracle:dba /dev/async
/usr/bin/chmod 000 /dev/async

The permissions on /dev/async of 000 ensure that it is not possible to use the async driver unintentionally.

As the oracle user, modify the "init.ora" file so that the parameters:

disk_asynch_io = false
tape_asynch_io = false



I would also suggest that you create a TAR in Metalink for a more proper followup. Most probably they already have a patch for that... please check

kind regards
yogeeraj
No person was ever honoured for what he received. Honour has been the reward for what he gave (clavin coolidge)
Greg Hall
Frequent Advisor

Re: Oracle10g mmnl errors

thanks people. I'm aware of the fix for the dev/async problem. This is with the Oracle support people.

I'm more interested in the "ksugetosstat failed" error. Is this related to the /dev/async problem? Could be, in which case I should ignore them until the dev/async issue is resolved.

Greg
Confucious Confused
Eric Antunes
Honored Contributor

Re: Oracle10g mmnl errors

Hi Greg,

The only way to know if the ksugetosstat error message is related to /dev/async file is to - assuming you use file systems and not raw devices - modify the init.ora parameter disk_asynch_io to false (as Yogeeraj said), restart the database and see if those trace files continue to be created.

Best Regards,

Eric Antunes
Each and every day is a good day to learn.
Dennis Murphy_3
Occasional Visitor

Re: Oracle10g mmnl errors

Can I ask a question?

Does this particular system have any iCOD CPU's?

I have a 48-way Superdome with 16 iCOD CPU's, and I'm getting the same trace errors about "ksugetosstat failed".

The only guess I have is that since I have 16 iCOD CPU's, Oracle can't access them. If you query the number of CPUs in the system (for example, from a print_manifest), I show 64 CPU's, but only 48 are active.

I -think- it's related to iCOD, but I'm not 100% sure yet.
Adam Mullen
Occasional Visitor

Re: Oracle10g mmnl errors

I'm also seeing this error on HPUX 11.11 running Oracle 10g r2. I don't understand why one would want to set disk_asynch_io to false though. Please explain this. Also, was a tar opened, if so, could you please provide the ID #.

Thanks, Adam
Mike Tufariello
Frequent Advisor

Re: Oracle10g mmnl errors

I noticed the dates on this thread and see they are older.

We just moved to Oracle 10g r2 on a PA-RISC running 11.11 OS. We too are now seeing hundreds of .trc files being created. Does the above thread still apply as a vaild solution ? Or has more research and other methods been developed to address this issue ?

Thanks