topic Re: swap addition in Operating System - HP-UX

swap addition

kelvin567 — Fri, 02 Nov 2007 08:44:54 GMT

Hello All,

I want to add additional 4 gb of device swap on my HP box....what all steps do i need to perform...?

Tnks

Re: swap addition

Hasan Atasoy — Fri, 02 Nov 2007 08:48:11 GMT

hi kelvin ;

1. lvcreate -L 4096 vg00
note that newly created lv name
2. add this lvname to /etc/fstab
/dev/vg00/yourlvname ... swap pri=1 0 0
3. swapon -a

mathmad.

Re: swap addition

Court Campbell — Fri, 02 Nov 2007 09:40:15 GMT

Mathmad is part of the way there. The lvcreate command should be:

lvcreate -C y -r n -L 4096 vg00

Swap should be contiguous and have bad block relocation turned off.

Re: swap addition

Patrick Wallek — Fri, 02 Nov 2007 09:46:40 GMT

You also need to be aware that if your 'maxswapchunks' kernel parameter (depending on your version of HP-UX) is too small, then you may not be able to use any or all of your newly created swap space.

maxswapchunks, if it needs adjusting, typically requires a reboot for it to become effective.

Re: swap addition

kelvin567 — Fri, 02 Nov 2007 09:50:26 GMT

guys as mathmad as suggested I created the swap lv, and I can see the changes in swapinfo -tam....However it has not allowed to create me a dump lvol since it needs to be countigous...

I believe if we are creating only swap lvol then lv does not need to be countigous

Re: swap addition

Court Campbell — Fri, 02 Nov 2007 10:22:30 GMT

You are correct. I guess it's just a habit.

Re: swap addition

rajdev — Sat, 03 Nov 2007 14:07:24 GMT

Hi Kelvin,

Its good practice to make swap volume also contiguous.

The manpage of lvlnboot has the following:

bootlv -- First volume on disk + contiguous + badblock relocation off
dumplv -- contiguous + badblock relocation off
rootlv -- contiguous + badblock relocation off
swaplv -- contiguous

Regards,
RD