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тАО09-17-2009 05:13 AM
тАО09-17-2009 05:13 AM
Async I/O on HP-UX
thx in advance
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тАО09-17-2009 05:45 AM
тАО09-17-2009 05:45 AM
Re: Async I/O on HP-UX
All versions of HP-UX support async i/o?
No.
All supported versions, 11.11, 11.23, 11.31 do support async i/o on cooked file systems and raw disk.
Raw disk used to offer a 10% performance advantage, however testing done in 2006 by A Clay Stephenson indicate that advantage has dwindled.
Backup and management is easier on cooked file systems.
SEP
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
Sponsor: http://hpux.ws
Twitter: http://twitter.com/hpuxlinux
Founder http://newdatacloud.com
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тАО09-17-2009 06:53 AM
тАО09-17-2009 06:53 AM
Re: Async I/O on HP-UX
This last could be because we have RBAC installed (but not effectively used) and the database runs within a secured compartment.
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тАО09-17-2009 08:09 AM
тАО09-17-2009 08:09 AM
Re: Async I/O on HP-UX
Do you have information how to set up async I/O on filesystems as it relates to setting it up with Oracle database processing? We├в re having issues in commit processing where It├в s take quite a bit of time to write log buffers to redologs which is causing considerable application wait.
This would be 11.23 on Itanium.
Thx in advance
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тАО09-17-2009 11:36 AM
тАО09-17-2009 11:36 AM
Re: Async I/O on HP-UX
We will support VxFS concurrent IO on the 0909 release of 11.31 via a patch in the Nov/Dec timeframe which may help in your scenario if you are on 11.31.
In the meantime, you should ensure that your online redo logs are on seperate filesystems from your datafiles (and ideally seperate disks) and that the filesystem has a 1K block size to avoid unaligned writes (fstyp -v on the filesystem should have "f_frsize: 1024")
If you have OnlineJFS for the redo log filesystems you should also use the following mount options:
delaylog,nodatainlog,convosync=direct,mincache=direct
HTH
Duncan
I am an HPE Employee
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тАО09-17-2009 11:37 AM
тАО09-17-2009 11:37 AM
Re: Async I/O on HP-UX
HTH
Duncan
I am an HPE Employee