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Home -> Community -> Mailing Lists -> Oracle-L -> Re: Async_io set up HP-UX for 10g Instances(these are apps instances)
Okay i agree with ur point..
am little confused with below point:
###########################################################################The Oracle8i DBWR process corrects this problem. Oracle8i's DBWR continuously writes without waiting for the previously issued calls to complete. As a result, slow writes no longer impact DBWR. This new feature allows DBWR to be inherently asynchronous in nature, regardless of the whether the OS supports asynchronous I/O or not. You configure multiple database writers by setting the parameter DB_WRITER_PROCESSES.
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regards,
Edwin.K
amonte <ax.mount_at_gmail.com> wrote:
You have already being told. You gain nothing if the operating system does not support Asycnhronous I/O
Alex
On 8/2/07, edwin devadanam < edwin_kodamala_at_yahoo.com> wrote: okay if i want to change disk_asynch_io = TRUE ...on what basis i can change...i mean
what advantages!
Thanks,
Edwin.K
amonte < ax.mount_at_gmail.com> wrote:
Read Note:139272.1
and you can see as LSC already pointed out
on HP-UX,
aio is *only* possible on a raw device. Put in another way, aio *cannot* be used on a filesystem.
Quite clear
On 8/2/07, edwin devadanam < edwin_kodamala_at_yahoo.com> wrote: Cheng,
the raw files system is for solaris server.
We are using normal Filesystem.
Already Async io is set in couple of other HP-UX servers........
on what basis can we change disk_asynch_io = FALSE to disk_asynch_io = TRUE (PLease see below information for clarity of my requirement)
Any docs pertaining to disk_asynch_io = TRUE and its Advantages
Thanks,
Edwin.K
LS Cheng < exriscer_at_gmail.com> wrote:
You need to setup raw devices to use AIO in HP-UX. No chance if you are using vxfs.
Thanks
--
LSC
On 8/2/07, edwin devadanam < edwin_kodamala_at_yahoo.com> wrote: Hi
We have this setup
db_writer_processes = 4 disk_asynch_io = false
I have doubts whether i can set the below on....
please suggest advantages and disadvantages of below setting.......on HP-UX
disk_asynch_io = TRUE
tape_asynch_io = TRUE
am unclear mainly about disk_asynch_io,db_writer_processes,DBWR_IO_SLAVES
Any help would be appreciated.
Regards,
Edwin.K
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