[ale] Anyone doing Oracle RAC on Linux?

[Philip Rodgers]

I couldn't get the drivers to compile.  Apparently the SCSI code in
the kernel changed at some point and all the include file weren't in
the kernel source.  It worked the HA worked fine as long as i didn't
worry about redundancy.

On 10/10/07, Jeff Lightner <jlightner at water.com> wrote:
> Phillip,
>
> Can you elaborate on what issue you saw using redundant paths for raw
> devices on RHEL5?
>
> Information gleaned in my install to date:
> Well it appears ASMLIB doesn't work with EMC PowerPath as of version 4.4
> of the latter.  The release notes for 4.3 talk about how to use it and
> the ones in 4.4 say not to use it at all (and remove it).   Since we're
> doing RHEL5 we have to use 5.01 and versions after 4.4 don't mention
> ASMLIB so my guess is they removed support from 4.4 and all subsequent
> versions.
>
> My coworker did an strace and found it had to do with the way the disk
> (LUN) responds to one call.  Apparently the multipath pseudo-devices
> (LUNs - called emcpower[A-Z] in PowerPath) don't respond the way a
> regular disk would so ASMLIB complains that it isn't a "partition".  He
> found comments that this was the issue for RDAC as well.
>
> I was going to fall back and use "raw" with udev (had already worked out
> udev raw device entries for ocr and votingdisk) but saw your comment
> about issues with redundant fibre paths for raw devices.   This wasn't
> an issue for ocr/voting disks on RHEL3.
>
>
> P.S.  To anyone else who wants to do RAC on RHEL5 I'd recommend going
> with OCFS2 out of the gate.  It supports OCR, Voting Disks and the
> Database storage.  Apparently raw devices are deprecated as of RHEL5 so
> may not be available in future.  I'm just proceeding down this path
> because we wanted to play with ASM rather than OCFS2.
>
> -----Original Message-----
> From: ale-bounces at ale.org [mailto:ale-bounces at ale.org] On Behalf Of
> Philip Rodgers
> Sent: Thursday, October 04, 2007 8:41 PM
> To: Atlanta Linux Enthusiasts
> Subject: Re: [ale] Anyone doing Oracle RAC on Linux?
>
> We have tested Oracle RAC on RHEL 4 and RHEL 5 with ASM (no OCFS)  We
> decided to go with RHEL 4 because I never could get the RDAC drivers
> for the fiber HBA to work with RHEL 5.  It was a StorageTek 2450 by
> the way.  It was very straight forward install on RHEL 4.  There is an
> Metalink article concerning install on RHEL 5.  Also the handling of
> raw devices is different on RHEL 5 which added to the install
> difficulties but it worked great as long as I didn't use redundant
> fiber connections.  Perhaps someone could shed some light on what to
> do when using RDAC linux on RHEL 5.
>
> On 10/4/07, Jeff Lightner <jlightner at water.com> wrote:
> >
> >
> >
> > We currently have Oracle RAC on RHEL3 using OCFS for the datafiles.
> There
> > is a project underway to do RAC on RHEL5 and we're trying to decide
> between
> > using ASM and OCFS2.
> >
> > Is anyone willing to share what they decided if they already did this
> on a
> > 2.6 kernel based Linux and why they decided it?
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>
> --
> Philip Rodgers
> philipfromga at gmail.com
> "We are spending ourselves into oblivion because we can't tax
> ourselves into prosperity"  Herman Cain
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-- 
Philip Rodgers
philipfromga at gmail.com
"We are spending ourselves into oblivion because we can't tax
ourselves into prosperity"  Herman Cain