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Full Discussion: mksysb
Operating Systems AIX mksysb Post 302216003 by shockneck on Thursday 17th of July 2008 06:00:41 PM
Old 07-17-2008
Quote:
Originally Posted by TinWalrus
i think the best way to do this is to have part of your paging on rootvg (memory*2) which is mirrored (or should be) then have an additional non-mirrored disk for additional paging space[...]
Well... Let's look at an example: my server has 48GB of RAM so my paging space should be as big as 96GB?

Let's have a look at shockneck's top four tips about AIX paging space:
1) If AIX uses paging space you lack RAM or/and you configured vmo wrong. If tuning cannot help anymore get more RAM chips. Best thing is not to use paging space.
2) There is no such thing as an "official" recommendation about how big paging space should be (beside some application vendors such as SAP and/or your app's allocation policy) for many years now. Default settings for AIX have become pretty small since AIX 5L. Paging space shall be as big as necessary but as small as possible. I.e. it depends on how you use the server.
3) If AIX uses paging space it stores data that does not fit into RAM (and is not stored on disk already). Thus losing paging space is equivalent to losing a memory chip. Hence if you don't mirror it the other (SAN) storage should be at least as safe as it would be on mirrored disks.
4) If you use several paging spaces keep them at about the same size. If you want to you can make hd6 slightly bigger as it is used during boot. Furthermore speed of different disks used for paging should not differ to a large extend. Don't use two or more paging spaces on the same disk.
 

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wml::std::box(3)						     EN Tools							  wml::std::box(3)

NAME
wml::std::box - Easily Create Rectangular Box SYNOPSIS
#use wml::std::box <box [attributes]> ... </box> DESCRIPTION
The "<box>" container tag puts its body into a nice rectangular box which itself is build via a HTML "<table>" construct. ATTRIBUTES
"header" This attribute switches between two totally different box variants. When it is present, a headlined box is created by the use of one single table but with space GIFs. When this attribute is missing a standard box is created by the use of two nested tables but without any space GIFs. "bgcolor" This sets the background color of the box. "fgcolor" This sets the foreground (text) color of the box. "bdcolor" This sets the color for the border of the box. The effect of this attribute is the automatic generation of a nested table construct to achieve the optical effect. "bdspace" This sets the space between the border and the body of the box in pixels. Default is 4 pixel. "bdwidth" This sets the border width in pixels. Default is 1 pixel. "width" This sets the total table width in pixels. Default is no specific width for the standard box and 300 pixels for the headlined box (because the headlined variant needs to know a fixed size to create the GIFs accordingly). "summary" Add a description of this table. This attribute is recommended in HTML 4.0. EXAMPLE
<box bdcolor="#000000" bdwidth=1 bdspace=10 bgcolor="#ffffff" fgcolor="#000000"> Foo Bar Quux </box> <box header="Foo Bar Quux Header" bdcolor="#000000" bdwidth=1 bdspace=10 bgcolor="#ffffff" fgcolor="#000000"> Foo Bar Quux </box> AUTHOR
Ralf S. Engelschall rse@engelschall.com www.engelschall.com REQUIRES
Internal: P1, P2 SEE ALSO
HTML "<table>" tag. EN Tools 2014-04-16 wml::std::box(3)
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