topic Re: Adding Secondary Swap File in Operating System - HP-UX

Adding Secondary Swap File

Andrew Kaplan — Mon, 11 Oct 2004 08:45:03 GMT

Hi there --

I am going to be adding an external drive to a Visualize C class system running 10.20. I plan on making a portion of the new disk, 1 GB, a secondary swap partition. My plan is to use SAM to complete this task. Is there anything in particular I should look for in SAM? Thanks.

Re: Adding Secondary Swap File

RAC_1 — Mon, 11 Oct 2004 08:50:28 GMT

Why exactly you are adding the swap space?? How much RAM you have?? and what is the swap space configured???

If enought swap space is configured, whay would one add secondary swap??

In case you still want to add it, the procedure is simple. Create a lvol.
lvcreate -L xxxM -Cy -r N /dev/vgxx
Add the line to the /etc/fstab

/dev/vgxx/lvolx ... swap pri=x 0 0
The priority can be set as you want. If you want to use secndary swap first, set the priority lower than the primary swap.

Anil

Re: Adding Secondary Swap File

Jeff Schussele — Mon, 11 Oct 2004 08:59:24 GMT

Hi Andrew,

Nothing in particular.
Just go to the Disks and File Systems section.
Then into Volume Groups -> Actions -> Create and choose the new disk, give the VG a name, optionally modify the defaults (do this if any more larger disks may be added to the VG). Then in this screen you can also create the new swap LV (Just make sure you define it as a swap device). That's all there is to it.

Of course it's usually faster from the command line - as follows:

pvcreate /dev/rdsk/cXtYdZ #(Use the appropriate new disk device)
vgcreate vg_name /dev/dsk/cXtYdZ
lvcreate -L 1000 -n lv_name vg_name
Edit the /etc/fstab & insert the following
/dev/vg_name/lv_name ... swap pri=0 0 0
Then run
swapon -a

NOTE: You may have to increase one of the following kernel parms to use more swap:
maxswapchunks
swchunk
Either/or will require a kernel rebuild & reboot.

HTH,
Jeff

Re: Adding Secondary Swap File

Andrew Kaplan — Mon, 11 Oct 2004 09:00:13 GMT

We currently have to little swap set up and there is no additional filesystem space available to add to the primary swap file. Consequently, the move to add the external drive and make it a secondary swap file.