Re: AIX Memory and Paging Space

From: Green, Simon (Simon.Green_at_EU.ALTRIA.COM)
Date: 05/13/05

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    Date:         Fri, 13 May 2005 12:12:37 +0200
To: aix-l@Princeton.EDU

    It's not possible to say that the paging space is oversized from the
    information available. If you allocate the minimum permitted paging space -
    required for the system to boot - but do no paging at all it will appear
    about 5% used. That's due to the LVM overhead and a small amount of data
    that goes in there at boot time.

    If the %used was 1% I might guess it was oversized; otherwise you'd have to
    know what the size really was. The original post does not suggest that this
    is the case. 

    --
Simon Green
Altria ITSC Europe s.a.r.l.
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-----Original Message-----
From: IBM AIX Discussion List [mailto:aix-l@Princeton.EDU] On Behalf Of
hercom
Sent: 13 May 2005 05:45
To: aix-l@Princeton.EDU
Subject: Re: AIX Memory and Paging Space
Paging space use will be very low: 5% is about right--> A paging space so
little used seems to be oversized. In general, the paging space should be
under 40%, and the size must be determined accordingly to the application
running (i.e. 4X the physical memory size for oracle). In AIX 5L a paging
space can be reduced without rebooting. Anyway, AIX always uses some paging
space, even keeping copies of the data on memory and on disk, as a
"predictive" paging.
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