I know of only one OS that supports ASYNC I/O on JFS and that's IBM AIX.
If you want ASYNC I/O on other operating systems my guess is you'll have to
use
raw devices ...
"El Toro" <medawsonjr_at_yahoo.com> wrote in message
news:2e1cd2b.0112272350.11c9fb47_at_posting.google.com...
> I've read both Metalink and Sun Blueprint documents that read
> how Oracle 8.1.5 and 8.1.6 will NOT use AIO on filesystem datafiles.
> It runs 'fstat()' to determine if the files are on filesystems, and
> acts accordingly (according to Oracle and Sun). Therefore, turning
> AIO on via 'disk_asynch_io=true' on such databases is futile, based
> on these two sources.
>
> However, I have 8.1.5 running on NFS *filesystems* from NetApps, and
> they are, in fact, using AIO. I've verified this by running a 'truss'
> on the DBWR process, noticing all the LWP processes spawned to perform
> the user-level library AIO after a failed 'kaio()' call (tell-tale
> signs of AIO). The OS is Solaris 2.6 - 2.8, by the way.
>
> So, what's the deal? Does Oracle 8.1.5 and .6 use AIO on filesystems
> or not? When is it that Oracle suppresses AIO on filesystems? I gotta
> save face here in front of my team members to whom I insisted that
> Oracle did away with filesystem AIO on filesystems. Please respond
> quickly, as I have a team meeting about this issue tomorrow.
>
> Thanks in advance.
Received on Fri Dec 28 2001 - 03:35:56 CST
