BN wrote,on my timestamp of 7/09/2006 4:54 AM:
> I remember reading Oracle Metalink Notes saying that Disk Async IO is
> not supported on HP-UX for Cooked Filesystems.
er...
you're correct in the Metalink references. But there is no such
thing as "cooked filesystems".
There is "raw" IO and "cooked" IO: the first is *without*
filesystems, the second *with* filesystems.
> We have disk_async_io=true for our Database in HP-UX 11.11 , Oracle
> 8.1.7.4 <http://8.1.7.4> and 10g Servers.
won't do a thing for you unless you're using raw database files - with
no file system associated, just the device name used as datafile
name in Oracle.
> Right now we are using 4 dbwr's. I appreciate your suggestions.
Keep using the 4 dbwrs and lose the disk_async_io parameter:
it's doing nothing unless you're using raw IO.
> Our UNIX SA says " Cooked Filesystems have their own Asynchronous
> Mechanisim that equally replaces Oracle Async IO"
I'll add my voice to Kevin's reply...
> What Am I missing here
A lot. To get aio in filesystems in HPUX you must use
a filesystem type that supports it. As of last time I checked
it, the only one that did in HP environments was vxfs, the
Veritas file system for HP. None of the native HPUX ones did.
Oh: did I mention that vxfs is an extra?
As in: "mucho dinero"?
--
Cheers
Nuno Souto
in sunny Sydney, Australia
dbvision@xxxxxxxxxxxx
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