Re: Can you help me on Linux SW RAID?

Re: Can you help me on Linux SW RAID?

[miele]

OK.

Finally I can say that one solution is to have a disk array HW-RAID compliant.
:-)))


Anyway, omitting RAID features I think my nodes should correctly see the same data on the shared disk array, using Oracle OCFS or RedHat GFS.
Do you agree?

Have you experienced problem using OCFS insetad of OCFS2??





> On 2005-04-28T13:41:45, "miele@inwind.it" <miele@inwind.it> wrote:
> 
> > Obviously I've plan to use OCFS (Oracle Cluster File System) to share
> > data access between nodes...
> > ..I've to implement an Oracle 9i RAC.
> 
> OCFS2 is fine for that.
> 
> > You discourage anyway my use of RAID??
> 
> md is NOT CLUSTER-AWARE. It will not work, and it will eat your data.
> 
> You have been warned.
> 
> Run the RAID level of your choice on the SAN backend, and put OCFS2 on
> top.
> 
> 
> Sincerely,
>     Lars Marowsky-Brée <lmb@suse.de>
> 
> -- 
> High Availability & Clustering
> SUSE Labs, Research and Development
> SUSE LINUX Products GmbH - A Novell Business
> 
> 



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Re: Can you help me on Linux SW RAID?

[Lars Marowsky-Bree]

On 2005-04-28T14:57:29, "miele@inwind.it" <miele@inwind.it> wrote:

> Have you experienced problem using OCFS insetad of OCFS2??

OCFS isn't available on 2.6. On 2.6, you have to use OCFS2.


Sincerely,
    Lars Marowsky-Brée <lmb@suse.de>

-- 
High Availability & Clustering
SUSE Labs, Research and Development
SUSE LINUX Products GmbH - A Novell Business

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RE: Can you help me on Linux SW RAID?

[J. Ryan Earl]

OCFS2 isn't stable yet, I wouldn't suggest its use for production systems.
Furthermore, where did the requirement for 2.6 (kernel I assume) come from?
Sounds like he was using RHEL3 anyway...

I'm not familar with the 9i RAC setup, but I installed a 10g RAC that's in
production now.  The only thing I use OCFS for is Cluster Registry, Disk
Voting, and the Oracle Parameter File.  All database nodes have access to
the same set of raw LUNs on the SAN managed via ASM (Automated Storage
Management, a 10g feature) for keeping actual data on.  You could just put
all your Oracle files/data on OCFS, but that's not the highest performance
solution.

To have multiple nodes access a non-Oracle data on a clustered filesystem,
go with GFS for sure, ie a normal POSIX complaint filesystem.  OCFSv1 isn't
POSIX complaint and only properly stores Oracle specific files, and though
OCFSv2 is meant to be a generic clustered filesystem, it's not production
ready like I mentioned before: http://oss.oracle.com/projects/ocfs2/

How you setup the RAID is completely different issue from how you cluster
your data among nodes.

-ryan

-----Original Message-----
From: linux-raid-owner@vger.kernel.org
[mailto:linux-raid-owner@vger.kernel.org]On Behalf Of Lars Marowsky-Bree
Sent: Thursday, April 28, 2005 8:07 AM
To: miele@inwind.it
Cc: jakob; linux-raid; mingo; bueso
Subject: Re: Can you help me on Linux SW RAID?


On 2005-04-28T14:57:29, "miele@inwind.it" <miele@inwind.it> wrote:

> Have you experienced problem using OCFS insetad of OCFS2??

OCFS isn't available on 2.6. On 2.6, you have to use OCFS2.


Sincerely,
    Lars Marowsky-Brée <lmb@suse.de>

--
High Availability & Clustering
SUSE Labs, Research and Development
SUSE LINUX Products GmbH - A Novell Business

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Re: Can you help me on Linux SW RAID?

[Lars Marowsky-Bree]

On 2005-04-28T14:18:28, "J. Ryan Earl" <ryan@dynaconnections.com> wrote:

> OCFS2 isn't stable yet, I wouldn't suggest its use for production systems.
> Furthermore, where did the requirement for 2.6 (kernel I assume) come from?
> Sounds like he was using RHEL3 anyway...

That wasn't mentioned in the mail I replied to; anyone deploying a new
2.4 based system right now is a bit behind the times in my opinion, I
hope 2.4 goes away soon ;-)

OCFS2 is already included in SLES9 SP2 beta; we'll ship it for
production use with SLES9 SP2 general availability.


Sincerely,
    Lars Marowsky-Brée <lmb@suse.de>

-- 
High Availability & Clustering
SUSE Labs, Research and Development
SUSE LINUX Products GmbH - A Novell Business

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RE: Can you help me on Linux SW RAID? [OT]

[J. Ryan Earl]

I've had 2.6 based systems deployed in datacenters for over a year now, and
it's pretty good for commodity hardware, but people still have to use 2.4
for most of the BigIron type stuff.  For instance, EMC only supports
PowerPath (their multi-pathing driver) for 2.4 last I checked, and though
the newest 2.6 line has EMC CX/AX multipathing support built into DM, it's
still experimental and I just can't tell a customer that's spent possibly
millions of dollars on hardware and software licenses that we're using new
unproven technology.  Tons of Oracle things only come for 2.4 (ASMlib for
example).

That, and, once things are setup, stable, and work, you generally just don't
want to change them *ahem* break them.  We -just- retired a Oracle database
that's been running a 2.4.9 derived kernel for the last two years.
Additionally 2.6 performance has varied widely between releases this year,
I've found that 2.6.3 was more stable than most of the versions that
followed it.  All my application servers run a 2.6 derived kernel, but the
database nodes will have to be on 2.4 for at least another year if not
two--how many people have tested 2.6's memory management performance on
systems with 32GB of RAM for instance?

Interesting on the OCFS2 support in SLES, our Oracle DBA prefered RHEL
because he had read about lots of problems between Oracle and SLES.  I
forwarded him your email =)  And now that I'm sufficiently off-topic, I will
be quiet.

J. Ryan Earl
Systems/Network Engineer
dynaConnections Corporation
512.306.9898

-----Original Message-----
From: Lars Marowsky-Bree [mailto:lmb@suse.de]
Sent: Thursday, April 28, 2005 2:56 PM
To: J. Ryan Earl; miele@inwind.it
Cc: jakob; linux-raid; mingo; bueso
Subject: Re: Can you help me on Linux SW RAID?


On 2005-04-28T14:18:28, "J. Ryan Earl" <ryan@dynaconnections.com> wrote:

> OCFS2 isn't stable yet, I wouldn't suggest its use for production systems.
> Furthermore, where did the requirement for 2.6 (kernel I assume) come
from?
> Sounds like he was using RHEL3 anyway...

That wasn't mentioned in the mail I replied to; anyone deploying a new
2.4 based system right now is a bit behind the times in my opinion, I
hope 2.4 goes away soon ;-)

OCFS2 is already included in SLES9 SP2 beta; we'll ship it for
production use with SLES9 SP2 general availability.


Sincerely,
    Lars Marowsky-Brée <lmb@suse.de>

--
High Availability & Clustering
SUSE Labs, Research and Development
SUSE LINUX Products GmbH - A Novell Business

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