Vijay Adik vadik@us - IBM
Vijay Adik vadik@us - IBM
Vijay Adik vadik@us - IBM
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
40<br />
<strong>IBM</strong> Advanced Technical Support - Americas<br />
AIX Filesystems Mount options<br />
� Journaled File System (JFS)<br />
Better for lots of small file creates & deletes<br />
– Buffer caching (default) provides Sequential Read-Ahead, cached writes, etc.<br />
– Direct I/O (DIO) mount/open option � no caching on reads<br />
� Enhanced JFS (JFS2)<br />
Better for large files/filesystems<br />
– Buffer caching (default) provides Sequential Read-Ahead, cached writes, etc.<br />
– Direct I/O (DIO) mount/open option � no caching on reads<br />
– Concurrent I/O (CIO) mount/open option � DIO, with write serialization<br />
disabled<br />
• Use for Oracle .dbf, control files and online redo logs only!!!<br />
� GPFS<br />
Clustered filesystem – the <strong>IBM</strong> filesystem for RAC<br />
– Non-cached, non-blocking I/Os (similar to JFS2 CIO) for all Oracle files<br />
GPFS and JFS2 with CIO offer similar performance as Raw Devices<br />
© 2009 <strong>IBM</strong> Corporation<br />
April 17, 2009
Change language