topic Re: Increasing Virtual Memory in Operating System - HP-UX

Increasing Virtual Memory

Ted McLean — Thu, 18 Mar 2004 15:35:48 GMT

Hey,

How do I increase the virual memory on an HP/UX 11.0 machine?

Re: Increasing Virtual Memory

Steven E. Protter — Thu, 18 Mar 2004 15:40:53 GMT

If by virtual memory, you mean swap?

Based on my assumpton of your experience. I would recommend sam.

sam
disks and filesystems
swap

actions add filsystem swap (you can do device,its faster, but requires more sysadmin skills)

Pick a nice filesystem with plenty of free space.

Follow the prompts.

Your system will boot at the end, this is unavoidable.

Total Swap/virtual memory should not exceed two times ram except in certain emergencies.

SEP

Re: Increasing Virtual Memory

Michael Tully — Thu, 18 Mar 2004 15:44:51 GMT

You can swap space on the fly. Be careful where... As swap like anything else should be balanced. Aviod placing it on the same LUN as used for primary swap. Once you have a LUN pointed out.

lvcreate -n swap1 /dev/myvg
lvextend -L /dev/myvg
swapon /dev/myvg/swap1

update the /etc/fstab file with an entry like this.

/dev/myvg/swap1 ... swap pri=1 0 0

Or SAM can aslo help, keeping in my the balacing act above.

Re: Increasing Virtual Memory

Nick Zraika — Thu, 18 Mar 2004 20:45:31 GMT

Bare in mind whislt swap can be added on the fly taking it off requires an outage.

i.e to remove you will need to uncomment the entry from /etc/fstab and reboot.

Nick