Caché Installation Guide - InterSystems Documentation
Caché Installation Guide - InterSystems Documentation
Caché Installation Guide - InterSystems Documentation
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Calculating System Parameters for UNIX and Linux<br />
0 pending disk I/Os blocked with no pbuf<br />
5060 paging space I/Os blocked with no psbuf<br />
5512714 filesystem I/Os blocked with no fsbuf<br />
194775 client filesystem I/Os blocked with no fsbuf<br />
0 external pager filesystem I/Os blocked with no fsbuf<br />
If you see an increase in the following parameters, increase the values for better <strong>Caché</strong> performance:<br />
• pending disk I/Os blocked with no pbuf<br />
• paging space I/Os blocked with no psbuf<br />
• filesystem I/Os blocked with no fsbuf<br />
• client filesystem I/Os blocked with no fsbuf<br />
• external pager filesystem I/Os blocked with no fsbuf<br />
When increasing these parameters from the default values:<br />
1. Increase the current value by 50%.<br />
2. Check the vmstat output.<br />
3. Run vmstat twice, two minutes apart.<br />
4. If the field is still increasing, increase again by the same amount; continue this step until the field<br />
stops increasing between vmstat reports.<br />
Important:<br />
Change both the current and the reboot values, and check the vmstat output regularly<br />
because I/O patterns may change over time (hours, days, or weeks).<br />
See the following IBM Web pages for more detailed information:<br />
• For a complete description of each of the fields reported by vmstat, see the vmstat Command<br />
page of AIX Commands Reference, Volume 6, v - z at:<br />
http://publib16.boulder.ibm.com/doc_link/en_US/a_doc_lib/cmds/aixcmds6/vmstat.htm<br />
• For instructions on how to increase these parameters, see the VMM page replacement tuning section<br />
of the AIX Performance Management <strong>Guide</strong> at:<br />
http://publib16.boulder.ibm.com/pseries/en_US/aixbman/prftungd/memperf5.htm<br />
• For a complete description of managing I/O tunable parameters, see the ioo Command page of<br />
AIX Commands Reference, Volume 3, i - m at:<br />
http://publib16.boulder.ibm.com/doc_link/en_US/a_doc_lib/cmds/aixcmds3/ioo.htm<br />
AIX Tunable Parameters<br />
None of the following listed parameters requires tuning because each is dynamically adjusted as needed<br />
by the kernel. See the appropriate AIX operating system documentation for more information.<br />
96 <strong>Caché</strong> <strong>Installation</strong> <strong>Guide</strong>
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