ADSM-L

Re: ADSM paging I/O

1998-04-09 11:30:52
Subject: Re: ADSM paging I/O
From: Scott Emmons <scotte AT CENTER.USCS DOT COM>
Date: Thu, 9 Apr 1998 08:30:52 -0700
You paging looks pretty healthy to me if your system is busy. Paging isn't
necessarily a bad thing... There are two types of paging in AIX:
persistent storage and working storage. In a nutshell, persistent storage
is essentially file cache - loading stuff from disk - like your DB and
LOG. Working storage is everything else - like heap and stack and stuff.

Monitor seperates the two types of paging. Persistent storage is shown in
pgin/pgout, while working storage (i.e. "swapping") is shown in
pgsin/pgsout. Since the latter numbers are ZERO, what you are seeing is
all file IO. I would not say it excessive, but it really depends on the
type of machine and what's it's doing. If you are really concerned about
it, you may want to consult a performance expert (which I am, by all
means, NOT!!).

You could start up "monitor" then halt ADSM and see if they go to zero...

Also, "monitor" is known to not be particularly accurate (and even lie!),
so use it only as a rough guideline. There are other tools (like svmon)
that will give you a more complete picture, but are not nearly as easy to
use.

Hope this helps,
-Scott
________________________________________________________________________
________________________________________________________________________
    L. Scott Emmons    | CableData R&D Center - El Dorado Hills, CA, USA
Staff Software Engineer|   Special Projects, Systems Development Dept
    (916) 939-6088     |  Views and content are my own, not CableData's
<Prev in Thread] Current Thread [Next in Thread>