Re: Disk Async IO
- From: "Zhu,Chao" <zhuchao@xxxxxxxxx>
- To: dbvision@xxxxxxxxxxxx
- Date: Sat, 9 Sep 2006 10:27:59 +0800
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@xxxxxxxxxxxx> 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 > 188.8.131.52 <http://184.108.40.206> 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 -- http://www.freelists.org/webpage/oracle-l
-- Regards Zhu Chao www.cnoug.org
- Re: Disk Async IO
- From: Nuno Souto
- Re: Disk Async IO