RE: 9205/9206 RAC on Linux RHAS 3.0

From: Henry Poras <henry_at_itasoftware.com>
Date: Thu, 27 Jan 2005 18:33:15 -0500
Message-ID: <00d101c504c8$9c6210d0$3800040a@itasoftware.com>

I heard (unconfirmed) that AIO doesn't work with OCFS on the 2.4 Linux kernal. Supposedly 2.6 is OK, as will be OCFS v2. Actually, the AIO that doesn't work, does work if the files are contiguous. I heard this from a source at Oracle, but never tested it myself.

Henry

-----Original Message-----
From: oracle-l-bounce_at_freelists.org =
[mailto:oracle-l-bounce_at_freelists.org]
On Behalf Of Marquez, Chris
Sent: Wednesday, January 26, 2005 3:42 PM To: Fabrizio.Magni_at_rasnet.it; thump_at_cosmiccooler.org; = oracle-l_at_freelists.org
Subject: RE: 9205/9206 RAC on Linux RHAS 3.0

I found out recently;

Oracle 9i support ASYNC IO on Linux.
Oracle OCFS supports ASYNC IO on Linux.

*HOWEVER* Oracle 9i RAC + OCFS + using ASYNC IO is NOT supported. ...but = I
am currently running it and I immediately notice that "shutdown = immediate"
hangs / terminates.

Have to "Ctrl+c" in me SQL> term and issue "shutdown immediate" again to stop the database!

Saw a simple bug logged on Metalink for HP and RAC...no good info = though.

Chris Marquez
Oracle DBA
HEYMONitor(tm) - heymonitor.com
"Oracle Monitoring & Alerting Solution"

-----Original Message-----
From: oracle-l-bounce_at_freelists.org =
[mailto:oracle-l-bounce_at_freelists.org]
On Behalf Of Magni Fabrizio
Sent: Wednesday, January 26, 2005 9:58 AM To: thump_at_cosmiccooler.org; oracle-l_at_freelists.org Subject: RE: 9205/9206 RAC on Linux RHAS 3.0

Maybe this is not relevant but I'm running several 9.2.0.5/6 on linux = and a
few RACs; the difference is that I'm using SLES not RHAS.

The configuration is not "bugless" (especially RAC) but I don't believe there is a product out there totally bugfree. Yesterday I experienced a crash on RAC 9.2.0.5 due to the number of pthread for process. Patching = at
9.2.0.6 should solve the problem but I'm living with crashes since = 9.2.0.1
and I'm confident the new patchset will introduce new issues.

Actually I don't see RAC has the definitive HA solution. I have higher uptime on single instance systems (to defend RAC I have to admit the one which crashes is the most stressed system of mine).

AIO is more problematic on SLES(9) than redhat.

Nonetheless linux is my preferred platform for oracle so far.

Fabrizio

> -----Original Message-----
> From: oracle-l-bounce_at_freelists.org=3D3D20 =3D20=20

>[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of David

> Sent: Tuesday, January 25, 2005 10:08 PM
> To: oracle-l_at_freelists.org
> Subject: 9205/9206 RAC on Linux RHAS 3.0

>=3D3D20
>=3D3D20

> Are you running 9025 or 9206 on Linux RHAS 3.0 with=3D3D20 =3D
disk_asynch_io

>enabled?  Are you running RAC?
>=3D3D20

> If so, I want to please hear from you...my managment wants to=3D3D20 =20

>get an idea  on number of sites running on our platform with AIO.
>=3D3D20

> Management is leary of the it can cause corruption and it has issues
> statem,entas that have been tosssed around in our community=3D3D20
> that I feel
> are more accurate for older versions of Linux and Oracle.

>=3D3D20

> My understanding is that 9205/9206 oin RHAS 3.0 is stable and no
> significant/known bugs.

>=3D3D20

> I am verifying the bug aspect and will test, but at this time I'm just
> trying to get approval to test with AIO.

>=3D3D20

> Thanks
> --=3D3D20
> ..
> David

>=3D3D20
>=3D3D20

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>=3D3D20

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Received on Thu Jan 27 2005 - 18:36:11 CST