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Re: Disk Async IO

From: Zhu,Chao <zhuchao_at_gmail.com>
Date: Sat, 9 Sep 2006 10:27:59 +0800
Message-ID: <962cf44b0609081927q234f5a8bh6bda144150e9c03f@mail.gmail.com>


 It looks to me the only filesystem HP is now supporting, is VXFS. http://h20338.www2.hp.com/hpux11i/cache/324830-0-0-0-121.html

HP-UX 11i offers customers the following choice of products:    OnlineJFS (equivalent to VERITAS
VxFS)<http://h20338.www2.hp.com/hpux11i/cache/324830-0-0-0-121.html#onlineJFS>    VERITAS Volume Manager
(VxVM)<http://h20338.www2.hp.com/hpux11i/cache/324830-0-0-0-121.html#VxVM>    VERITAS Cluster Volume Manager (CVM) - provides clustering capability on top of VxVM<http://h20338.www2.hp.com/hpux11i/cache/324830-0-0-0-121.html#VxVM>    Logical Volume Manager (LVM) which is included in HP-UX<http://h20338.www2.hp.com/hpux11i/cache/324830-0-0-0-121.html#LVM>    Mirrordisk/UX - provides mirroring capability for LVM<http://h20338.www2.hp.com/hpux11i/cache/324830-0-0-0-121.html#LVM>

  HP will continue its investment in LVM to meet the requirements of our large customer base. For customers who need host-based advanced volume management functionality and a common host-based solution across heterogeneous operating systems, HP offers VxVM integrated with HP-UX 11i

On 9/7/06, Nuno Souto <dbvision_at_iinet.net.au> wrote:
>
> 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_at_iinet.net.au
> --
> http://www.freelists.org/webpage/oracle-l
>
>
>

-- 
Regards
Zhu Chao
www.cnoug.org

--
http://www.freelists.org/webpage/oracle-l
Received on Fri Sep 08 2006 - 21:27:59 CDT

Original text of this message

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