Re: Oracle RAC and OGFS

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On Friday 23 April 2004 10:25 pm, Robert Wipfel wrote:
> Oracle since around verison 8.x has its own built-in DLM (not unlike
> openDLM) for managing shared access to the database blocks of database
> tables stored in tablespaces stored in OS files or raw partitions. Pre
> version 8.x the h/w vendor had to provide the DLM and for IBM's
> clusters, they shipped what became openDLM. Then Oracle sucked their own
> DLM into the core database and made it a standard.

I just wasn't sure if they dropped back to fs based locking if it was=20
available. I guess you answered my question.

>
> Oracle does direct IO to OS files. Best not to get in Oracle's way. The
> benefit of ocfs is that it gives a file system name to otherwise raw
> partitions and so simplifies management of the database's data by
> supplying a modified fileutils package that supports normal file like
> management of the database files. But ocfs is not a general purpose
> cluster file system and can't be used for executable or config files
> located in ORACLE_HOME for example. For that you'd want to use a real
> Posix cluster file system.
>
> How many nodes will openGFS run on now?

Depends.
With memexp: I think the limit is 32, but afaik, it's only ever been tested=
=20
with 16.
With OpenDLM:=20
	using the old heartbeat membership: 2
	using heartbeat's newer ccm: Unknown (there is an arbitrary limit of 100,
		don't know how many have been tested in reality)

=2D --Brian

>
> Thanks,
> Robert
>
<snip>

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