topic Re: Swap in Operating System - HP-UX

Swap

JOHN TURNER_2 — Thu, 10 Mar 2005 03:59:14 GMT

How do i go about increasing the size of swap on a hp-ux 11.11 server. Can i just increase the size of swap or do i need to create a new swap slice

cheers
john

Re: Swap

Alex Lavrov. — Thu, 10 Mar 2005 04:05:56 GMT

It's not good to increase the current swap, because you will harm it's integrity.

You should create a new LV and use as swap space.

Refer to these threads for more info:
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=242275
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=58315

Re: Swap

Adisuria Wangsadinata_1 — Thu, 10 Mar 2005 04:08:16 GMT

Hi John,

It's better you create a new swap ... can use SAM for easier way

It's troublesome to increase the size of swap

Hope this can help you.

Best Regards,
Adisuria Wangsadinata

Re: Swap

Mark Nieuwboer — Thu, 10 Mar 2005 04:09:32 GMT

hi John,

Just increacing the current swapspace can't be done online. you have to reboot the system than and extend it in runlevel 1.
Beter or simpler is to make another swap file system with.

4. Create logical volume.
lvcreate -L 200 â m â n 1 swap -C y -r n /dev/vg00
in case of san disks lvcreate â L 2000 â m â n 1 â C y â r n /dev/vgswap

Watch carefuly you only can use the â m option if you have a mirror disk on the other location if not then donâ t use the â m option.

Example command creates a 200-megabyte contiguous logical volume called swap in
the vg00 volume group. The logical volume also has bad block reallocation
turned off.
See "man 1m lvcreate" for more information.

5. Then edit /etc/fstab (HP-UX 10.X, 11.X) or /etc/checklist (HP-UX 9.X)
to enable swap after each shutdown of the system.

example /etc/fstab entry:

/dev/vg00/swap ... swap pri=1 0 1 #device swap
6. Enable swap using swapon command.

Re: Swap

MarkSyder — Thu, 10 Mar 2005 04:22:12 GMT

If you have more than one disc you will get better system performance by having a swap area set up on each rather than one big swap area.

Mark Syder (like the drink but spelt different)