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Message-ID: <6e9345580609090016i88a724ds70692d6bee645afc@mail.gmail.com>
Date: Sat, 9 Sep 2006 09:16:07 +0200
From: "LS Cheng" <exriscer@gmail.com>
To: bnsarma@gmail.com
Subject: Re: Disk Async IO
Cc: _oracle_L_list <oracle-l@freelists.org>
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Hi

I think if you have Veritas Quick I/O it would have similar performance as
RAW Device.

If you have OnlineJFS without the Quick I/O then your parameters is doing
nothing as other suggested. However with Online JFS you can use direct I/O
which has a decent performance, by default direct I/O is not enabled, you
have to modify the mount options.

Both Online JFS and Veritas Quick I/O are very expensive though....


Rgds


On 9/6/06, BN <bnsarma@gmail.com> wrote:
>
>  Greetings,
>
> I remember reading Oracle Metalink  Notes saying that Disk Async IO is not
> supported on HP-UX for Cooked Filesystems.
>
> We have disk_async_io=true for our Database in HP-UX 11.11 , Oracle
> 8.1.7.4 and 10g Servers.
>
> I would like to ensure that my understanding and setting is right.
>
> Right now we are using 4 dbwr's. I appreciate  your suggestions.
>
> Our UNIX SA says  " Cooked Filesystems have their own Asynchronous
> Mechanisim that equally replaces Oracle Async IO"
>
> What Am I missing here
>
> Appreciate your suggestions.
>
> --
> Regards & Thanks
> BN
>

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<div>Hi</div>
<div>&nbsp;</div>
<div>I think if you have Veritas Quick I/O it would have similar performance as RAW Device.</div>
<div>&nbsp;</div>
<div>If you have OnlineJFS without the Quick I/O then your parameters is doing nothing as other suggested. However with Online JFS you can use direct I/O which has a decent performance, by default direct I/O is not enabled, you have to modify the mount options.
</div>
<div>&nbsp;</div>
<div>Both Online JFS and Veritas Quick I/O are very expensive though....</div>
<div>&nbsp;</div>
<div>&nbsp;</div>
<div>Rgds<br><br>&nbsp;</div>
<div><span class="gmail_quote">On 9/6/06, <b class="gmail_sendername">BN</b> &lt;<a href="mailto:bnsarma@gmail.com">bnsarma@gmail.com</a>&gt; wrote:</span>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<div>
<div>Greetings,</div>
<div>&nbsp;</div>
<div>I remember reading Oracle Metalink&nbsp; Notes saying that Disk Async IO is not supported on HP-UX for Cooked Filesystems.</div>
<div>&nbsp;</div>
<div>We have disk_async_io=true for our Database in HP-UX 11.11 , Oracle <a onclick="return top.js.OpenExtLink(window,event,this)" href="http://8.1.7.4/" target="_blank">8.1.7.4</a> and 10g Servers.</div>
<div>&nbsp;</div>
<div>I would like to ensure that my understanding and setting is right.</div>
<div>&nbsp;</div>
<div>Right now we are using 4 dbwr's. I appreciate&nbsp; your suggestions.</div>
<div>&nbsp;</div>
<div>Our UNIX SA says &nbsp;&quot; Cooked Filesystems have their own Asynchronous Mechanisim that equally replaces Oracle Async IO&quot;</div>
<div>&nbsp;</div>
<div>What Am I missing here</div>
<div>&nbsp;</div>
<div>Appreciate your suggestions.<br clear="all"><br>-- <br>Regards &amp; Thanks<br>BN </div></div></blockquote></div><br>

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