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.
44<br />
<strong>IBM</strong> Advanced Technical Support - Americas<br />
CIO Demotion and Filesystem Block Size<br />
Data Base Files (DBF)<br />
� If db_block_size = 2048 � set agblksize=2048<br />
� If db_block_size >= 4096 � set agblksize=4096<br />
Online redolog files & control files<br />
� Set agblksize=512 and use CIO or DIO<br />
Mount Filesystems with “noatime” option<br />
� AIX/Linux records information about when files were created and last<br />
modified as well as last accessed. This may lead to significant I/O<br />
performance problems on often accessed frequently changing files<br />
such as the contents of the /var/spool directory.<br />
© 2009 <strong>IBM</strong> Corporation<br />
April 17, 2009
Change language