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vmstat

Posted on 2001-08-16
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Last Modified: 2013-12-27
Hi,
I use the vmstat to the solaris machine, and in the page field, mf column, there is some numbers inside it,

according to the manual, it is a minor fault. can i know what is minor fault in page,

and other possibility to cause this problem, and how to solve it
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Question by:heanseng
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6 Comments
 
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Expert Comment

by:newmang
ID: 6395141
This is part of the paging process.

If process requires a new page and doesn't have a free page in its own set it will request a page from the free list - this generates a minor fault.
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Expert Comment

by:Otetelisanu
ID: 6405116
mf
minor faults -- but see the -S option for how this field is modified.
vmstat -S
Report on swapping rather than paging activity. This option will change two fields in vmstat's ``paging'' display: rather than the ``re''and ``mf'' fields,
vmstat will report ``si'' (swap-ins)
and ``so'' (swap-outs).
Increase your swap.
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Author Comment

by:heanseng
ID: 6405324
hi,
after i use the -S option, all the si and so remain 0
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Expert Comment

by:Otetelisanu
ID: 6405663
The system is OK !!
You can see your
system (page,swap) with perfmeter
(Xwindow)
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Author Comment

by:heanseng
ID: 6408746
I acccesing the server remotely( though telnet), so can't use the xwindows,
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Accepted Solution

by:
besky earned 50 total points
ID: 6437544
The paging algorithm in the Solaris kernel is always on the hunt for pages not beeing used for a while. When a page has reached the timeout it put in a list called the free list.

If the page is needed again and it is found on the free list with all the contents intact it generates a minor fault. A major fault would be to take a new page and load the data from disk into this page, which ofcourse takes a lot longer.

It not really an error just the way the paging system works. It can be tuned but try it on a test system first.

If you are running anything but Solaris 8 put the line
set priority_paging=1
in the /etc/system file and do a boot -r to reconfigure the system.

Tip, if you have the Solaris Documentation cd there is a section on tunable kernel parameters.
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