Oracle-L: RE: RAC

From: Boivin, Patrice J <BoivinP_at_mar.dfo-mpo.gc.ca>
Date: Thu, 18 Apr 2002 07:13:22 -0800
Message-ID: <F001.00447E26.20020418071322@fatcity.com>

I remember they mentioned that Compaq Tru64 (and perhaps VMS) has a cluster file system which runs over fiber optic line between the cluster servers. The servers use it to stay in synch and to share information.

For the datafiles, they recommended using one of the Tru64 file systems instead of RAW. The Compaq people said that direct I/O works with (one?) of their file systems. I remember a couple of years ago I was told that Tru64 4.0d didn't do true direct I/O, it was simulated. Oracle told me not to assume that Tru64 supported direct I/O for non-RAW partitions back then. Apparently that has been fixed.

When they compared load sharing with other cluster servers, the only one they mentioned as an example was the Windows2000 cluster server, probably because it's popular.
Regards,
Patrice Boivin
Systems Analyst (Oracle Certified DBA)

Systems Admin & Operations | Admin. et Exploit. des systèmes
Technology Services        | Services technologiques
Informatics Branch         | Direction de l'informatique 
Maritimes Region, DFO      | Région des Maritimes, MPO

E-Mail: boivinp_at_mar.dfo-mpo.gc.ca

-----Original Message-----

Sent:	Thursday, April 18, 2002 10:59 AM
To:	Multiple recipients of list ORACLE-L
Subject:	Re: RAC

Ron, This information is incorrect. RAC is available on there platforms without shared file systems. I have RAC running on SUN, NT and Linux. All of these platforms have shared raw devices and are concurrently accessed. RAC on shared file systems is only supported on Tru64, OpenVMS and starting in July it will be supported on Solaris using Veritas's CFS (9iR2+ Only). Oracle is also developing a CFS that will ship later this summer or fall that will be supported with 9iR2. The other thing is that RAC does not support SAN drives at this time. Only single instance environments support SAN environments with specific equipment.

Scott

Ron Rogers <RROGERS_at_galottery.org> wrote:
> Jonathan,
> At the seminars I have attended it was pointed out
> that the :true RAC"
> is COMPAQ only. The seminar was hosted by
> Oracle/Compaq. Compaq RAC
> allows multiple CPU's to mount and use/share the
> same datafiles in a
> true RAC configuration. The drives including the os
> drive are on a SAN
> and shared by the CPU's so knowledge is shared. It
> was pointed out the
> new Linux RAC can only share a RAW device and not a
> datafile. I don't
> know if this is true as I have not tried it yet. The
> speaker at the
> seminar said that with other OS's a RAC is like a
> High Availability (HA)
> option, one CPU is doing nothing until the first one
> fails or you only
> run different applications and datafiles on one CPU
> and other
> applications and datafiles on the second CPU. if one
> fails you have to
> mount the datafiles and switch applications to the
> active CPU.
> To use a true RAC you have to use Compaq and I
> think the market share
> of the OS's are not True64, so there are probably
> not a lot of users of
> RAC.
> Ron
> ROR mª¿ªm
>
> >>> listmail_at_gennick.com 04/17/02 10:18PM >>>
> I was talking w/someone today, and we realized that
> neither
> of us knows of anyone actually using RAC in
> production. So
> now I'm curious. Is anyone?
>
> Jonathan Gennick --- Brighten the corner where you
> are
> mailto:jonathan_at_gennick.com
> http://Gennick.com * http://MichiganWaterfalls.com *
> http://ValleySpur.com
> --
> Please see the official ORACLE-L FAQ:
> http://www.orafaq.com
> --
> Author: Jonathan Gennick
> INET: listmail_at_gennick.com
>
> Fat City Network Services -- (858) 538-5051 FAX:
> (858) 538-5051
> San Diego, California -- Public Internet
> access / Mailing Lists
>

> To REMOVE yourself from this mailing list, send an
> E-Mail message
> to: ListGuru_at_fatcity.com (note EXACT spelling of
> 'ListGuru') and in
> the message BODY, include a line containing: UNSUB
> ORACLE-L
> (or the name of mailing list you want to be removed
> from). You may
> also send the HELP command for other information
> (like subscribing).
> --
> Please see the official ORACLE-L FAQ:
> http://www.orafaq.com
> --
> Author: Ron Rogers
> INET: RROGERS_at_galottery.org
>
> Fat City Network Services -- (858) 538-5051 FAX:
> (858) 538-5051
> San Diego, California -- Public Internet
> access / Mailing Lists
>

> To REMOVE yourself from this mailing list, send an
> E-Mail message
> to: ListGuru_at_fatcity.com (note EXACT spelling of
> 'ListGuru') and in
> the message BODY, include a line containing: UNSUB
> ORACLE-L
> (or the name of mailing list you want to be removed
> from). You may
> also send the HELP command for other information
> (like subscribing).

Do You Yahoo!?
Yahoo! Tax Center - online filing with TurboTax http://taxes.yahoo.com/

-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Scott
  INET: oraracdba_at_yahoo.com

Fat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051
San Diego, California        -- Public Internet access / Mailing Lists
--------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB ORACLE-L
(or the name of mailing list you want to be removed from).  You may
also send the HELP command for other information (like subscribing).
-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Boivin, Patrice J
  INET: BoivinP_at_mar.dfo-mpo.gc.ca

Fat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051
San Diego, California        -- Public Internet access / Mailing Lists
--------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB ORACLE-L
(or the name of mailing list you want to be removed from).  You may
also send the HELP command for other information (like subscribing).

Received on Thu Apr 18 2002 - 10:13:22 CDT