[Linux-cluster] Which lock manager to use on a 2-node GFS Cluster?

[Hirantha Wijayawardena]

Hi,

I also wanted to post the same question on Bob post. But I given-up to ask
'cause it written as " DLM should work just fine." From the clause "Right
now, Oracle and Oracle RAC are only certified to work with the GULM locking
manager. So Oracle won't support your configuration if you're using DLM.
However, DLM should work just fine. Also, GULM has works fine on more than
32 nodes."

I just wanted to know was whether we could run Oracle or oracle RAC on
2-node cluster with DLM

Thanks in advance

- Hirantha



> -----Original Message-----
> From: linux-cluster-bounces at redhat.com [mailto:linux-cluster-
> bounces at redhat.com] On Behalf Of Celso K. Webber
> Sent: Wednesday, August 16, 2006 8:09 AM
> To: linux clustering
> Subject: [Linux-cluster] Which lock manager to use on a 2-node GFS
> Cluster?
> 
> Hello all,
> 
> Sorry for returning with a similar question: a few weeks ago, Bob
> Peterson kindly answered a question of mine about selecting the right
> lock manager. He added this answer to his Cluster Project FAQ:
> http://sources.redhat.com/cluster/faq.html#dlm_which
> 
> The FAQ states that Oracle only supports GULM and not DLM.
> 
> I had difficulties about setting up GULM under GFS 6.0 (RHELv3 based,
> Linux kernel 2.4.x) because of the need of an even number of lock
> managers. The GFS 6.0 manual states that you cannot use 2-node GULM lock
> managers:
> http://www.redhat.com/docs/manuals/csgfs/admin-guide/s1-locl-gulm.html#S2-
> LOCK-GULM-NUMSVRS
> 
> The above section of the manual (section 8.2.2) states that you must
> have at least 3 GULM lock managers for a high availability locking
> systems under GFS.
> 
> Question: is this still true under GFS 6.1 (RHELv4 based, 2.6.x kernel)?
>   Since Oracle demands GULM, can I have a 2-node GULM GFS locking system
> on a 2-node GFS Cluster?
> 
> If not, which is the best option and which are supported by Red Hat?
> a) to have just 1 lock manager in one of the Cluster Nodes;
> b) to have just 1 lock manager in a machine outside the Cluster;
> c) to have 2 GULM lock manager on the cluster nodes;
> d) to have 3 or 5 lock managers using both the 2 cluster nodes and other
> servers?
> 
> Sorry for this recurring question, I wish to make sure of the correct
> environment I should deploy for a customer who needs GFS (officially
> licensed from Red Hat).
> 
> Thank you all in advance.
> 
> Celso.
> 
> PS: I think this could be useful to be in the FAQ. What do you think Bob?
> 
> --
> *Celso Kopp Webber*
> 
> celso at webbertek.com.br <mailto:celso at webbertek.com.br>
> 
> *Webbertek - Opensource Knowledge*
> (41) 8813-1919
> (41) 3284-3035
> 
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