Re: RAC/CRS and OCFS2

On Mar 15, 10:19 am, "Keith" <kkna..._at_gmail.com> wrote:
> On Mar 15, 9:59 am, "hpuxrac" <johnbhur..._at_sbcglobal.net> wrote:
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> > On Mar 15, 9:50 am, "Keith" <kkna..._at_gmail.com> wrote:
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> > > Hello RAC gurus,
>
> > > I am currently running 10.2.0.3 RAC/CRS on RHEL4. All our database
> > > files are using ASM/raw devices. However, we now have the need for a
> > > clustered file system. This file system likely would not be used
> > > directly by the database, but requires high availability. So, we'd
> > > like to use OCFS2 -- which has prompted some questions:
>
> > > Are there any conflicts or issues with running OCFS2 and CRS
> > > concurrently?
> > > Can they share the same private interconnect?
> > > Would this be an Oracle supported configuration?
> > > If it is supported, ishttp://oss.oracle.com/projects/ocfs2/files/
> > > Oracle's preferred place to obtain the software?
>
> > > If OCFS2 panics the system (or anything "panics" the system), what is
> > > the expected system behavior? (I'm curious if OCFS2 would ever prompt
> > > or initiate a cluster node to be evicted/rebooted/etc).
>
> > > Also, Metalink note 391771.1 discusses a bug that affects RHEL4 (fixed
> > > in a later version than I'm running):
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> > > "Kernel panic - not syncing: ocfs2 is very sorry to be fencing this
> > > system by panicing"
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> > > It gives the option of using the "DEADLINE" IO scheduler versus the
> > > "CFQ" IO scheduler. Is there any impact associated with this change?
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> > > Any help is greatly appreciated. This came up on me very quick -- and
> > > my 9i -> 10g migration is scheduled for next weekend. I'm in a pinch!
>
> > You are planning on not only implementing 10g next weekend but also
> > including a new clustered file system in an environment where you
> > haven't done exhaustive testing ... I wouldn't worry if I were you!
>
> > Opinions vary on ocfs2 but even some of the most devoted linux/oracle
> > fans think it's something to run away from.
>
> > If you really proceed down this path I would recommend using oracle
> > consulting to install the OCFS2 and the 10g implementation so that you
> > don't put your job on the line.
>
> Well, the RAC/CRS has been tested thoroughly; but the OCFS2 is the new
> requirement. As I started to read the OCFS2 users guide, I become
> very wary b/c of the OCFS2 "cluster services" -- I'm concerned they
> may interfere with CRS. If OCFS2 is not the way to go, are there
> better, proven alternatives? RH GFS?

Personally I would look at veritas for the clustered file system but that's me.

Officially I think that oracle is still "promoting" OCFS2 ...

>
> If it helps any, I have two RAC nodes tapping into an EMC storage
> array. On one node I have a file system built that will be NFS'd out
> to several "client" systems (in support of an old web technology that
> I'm not sure when will be replaced). Management would like this file
> system "clustered" for high availability. Which raises more
> questions:
>
> If I NFS mount a clustered file system, can I only NFS mount from one
> of the nodes?
> If so, should that node go down, would I still lose the NFS mount and
> be forced to remount from a surviving node?
> Is there likely an "online" and quick method to re-present the disk
> (say, from the SAN side) to the surviving node and mount the file
> system there (so as to avoid using a clustered file system altogether)?- Hide quoted text -
Received on Thu Mar 15 2007 - 09:55:07 CDT