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Oracle RAC on RedHat Linux Best Practice guide and ... - OpenMPE

Oracle RAC on RedHat Linux Best Practice guide and ... - OpenMPE

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OCFS <strong>and</strong> <str<strong>on</strong>g>RAC</str<strong>on</strong>g><br />

• Maintains cache coherency across nodes for the<br />

filesystem metadata <strong>on</strong>ly<br />

• Does not synchr<strong>on</strong>ize the data cache buffers across<br />

nodes, lets <str<strong>on</strong>g>RAC</str<strong>on</strong>g> h<strong>and</strong>le that OCFS journals filesystem<br />

metadata changes <strong>on</strong>ly<br />

• Filedata changes are journalled by <str<strong>on</strong>g>RAC</str<strong>on</strong>g> (log files)<br />

• Overcomes some limitati<strong>on</strong>s of raw devices <strong>on</strong> <strong>Linux</strong><br />

• No limit <strong>on</strong> number of files<br />

• Allows for very large files (max 2TB)<br />

• Max volume size 32G (4K block) to 8T (1M block)<br />

• <str<strong>on</strong>g>Oracle</str<strong>on</strong>g> DB performance is comparable to raw<br />

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