Very Computer

by **zilla3..** » Thu, 16 Dec 1999 04:00:00

I have an R50 system that has two paging spaces
defined (from lsps -a):

paging00 1280MB Percent used (7%)
hd6 512MB Percent used (20%)

Question 1: Is the order that the swap spaces
are returned in lsps the order in which the swap
spaces used? or does the below swapspaces file
determine that?

/etc/swapspaces is defined as follows:

hd6:
dev = /dev/hd6

paging00:
dev = /dev/paging00

Question 2: Why are both swap spaces used since
neither of them are even close to being used
completely on their own?

Question 3: hd6 is on a mirrored rootvg paging00
is on a SSA RAID filesystem. I would like to get
rid of hd6 and only use paging00 for performance
reasons. Is this advisable if the paging space
on /dev/paging00 is large enough?

Thanks in advance for any help.

Jamie

Sent via Deja.com http://www.deja.com/
Before you buy.

by **Christopher J. Matter** » Thu, 16 Dec 1999 04:00:00

> I have an R50 system that has two paging spaces
> defined (from lsps -a):
> paging00 1280MB Percent used (7%)
> hd6 512MB Percent used (20%)
> Question 1: Is the order that the swap spaces
> are returned in lsps the order in which the swap
> spaces used? or does the below swapspaces file
> determine that?

AIX likes to use an equal amount of all paging
spaces, as in this case, where it is using
about 90 to 100 MB of each space. For this
reason, it is a good idea to make all your
paging spaces the same size.

Quote:> /etc/swapspaces is defined as follows:
> hd6:
> dev = /dev/hd6
> paging00:
> dev = /dev/paging00
> Question 2: Why are both swap spaces used since
> neither of them are even close to being used
> completely on their own?

See above.

Quote:> Question 3: hd6 is on a mirrored rootvg paging00
> is on a SSA RAID filesystem. I would like to get
> rid of hd6 and only use paging00 for performance
> reasons. Is this advisable if the paging space
> on /dev/paging00 is large enough?

If you do not have at least 32MB of paging
space in the rootvg, AIX will refuse to boot.
So, no, getting rid of hd6 is not a good
idea.

Chris Mattern

by **Norman Levi** » Thu, 16 Dec 1999 04:00:00

> I have an R50 system that has two paging spaces
> defined (from lsps -a):

> paging00 1280MB Percent used (7%)
> hd6 512MB Percent used (20%)

> Question 1: Is the order that the swap spaces
> are returned in lsps the order in which the swap
> spaces used? or does the below swapspaces file
> determine that?

**** no. You just got 'luck of the draw'

Quote:> /etc/swapspaces is defined as follows:

> hd6:
> dev = /dev/hd6

> paging00:
> dev = /dev/paging00

> Question 2: Why are both swap spaces used since
> neither of them are even close to being used
> completely on their own?

*** the fact that BOTH are named in /etc/swapspaces means they
can both be used. More, /etc/rc issues a "swapon all" which
activates all paging lv's named in /etc/swapspaces

Quote:> Question 3: hd6 is on a mirrored rootvg paging00
> is on a SSA RAID filesystem. I would like to get
> rid of hd6

*** AIX Really like having a paging lv that is available
when in SINGLE user mode. The ONLY page space brought
on in this mode is hd6. Keep hd6 and keep it small.

What you MAY want to do is, chps -n paging00
and reboot the system. then paging00 will not be
activated. You can then 'rmps' and recreate the
paging00 at a more reasonable size.

Quote:> and only use paging00 for performance
> reasons. Is this advisable if the paging space
> on /dev/paging00 is large enough?

> Thanks in advance for any help.

> Jamie

> Sent via Deja.com http://www.deja.com/
> Before you buy.

--
-------------
Norman Levin - VM/dynAmIX inc

Very Computer

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