Solaris 8 and asynch IO
- From: thump604@xxxxxxxxxxx
- To: oracle-l@xxxxxxxxxxxxx
- Date: Fri, 19 Mar 2004 19:40:14 +0000
Happy Friday everyone!
I would like to hear from some others regarding their opinions and feedback in
terms of asynch IO on Solaris when Veritas is not in the mix.
OS Solaris 8
DB 8174
We know that if Quick IO or raw devices are not available that Solaris only
simulates asynch IO with a failed kaio call and then the use of light weight
threaded processes if disk_asycnh_io is set to true. If disk_asynch_io is set
to false and dbwr_io_slaves are employed, then asycnh IO is simulated, but this
time at the database level. My understanding is that IO slaves in terms of
simulating asycnh IO can setrvice IO requests for most of the Oracle internal
processes, where as OS pwrite/pread calls are more limited in what requests
they can service.
With that, the question remains is there a hard answer or actual best practice
in terms of disk_asycnch_io=false/true combined with db_writer_processes VS
dwr_io_slaves?
I believe that the setting of false and 4 dbwr_io_slaves is optimal.
I would like to hear what others think or have found on this matter.
--
- David / Thump
Life is what happens while waiting
or planning for the future.
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