Re: Oracle RAC and OGFS

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.
>
>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?
>  
>

They are also working on ocfs2 which will allow a shared ORACLE_HOME
http://oss.oracle.com/projects/ocfs2/


-aneesh


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ph: 603-884-5742




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