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#1 (**permalink**) 01-16-2008, 07:38 PM

Hi all!

I want to increase the swap space on my HP machine.
Can anybody suggest the procedure how to do it?

Thanks in advance,
Anunay

#2 (**permalink**) 01-16-2008, 07:38 PM

Hi

You cannot increase the primary swap, but you can add additional logical
volumes and use them for secondary swap.

If you use SAM for creating the LVols it already offers the usage as
swap instead of for file systems.

Manually its done by:
lvcreate -L <size-in-MB> /dev/vgXX
swapon /dev/vgXX/lvolX
This activates the swap immediately until next reboot

for permanent secondary swap
edit /etc/fstab and add a line like
/dev/vgXX/lvolX / swap defaults 0 0

Pay attention: The kernel parameter maxswapchunks must be set correct!
maxswapchunks is 1 chunk for 2 MB RAM

If maxswapchunks is not set large enough the additionalswap won't be
used (without any notification).

Florian

#3 (**permalink**) 01-16-2008, 07:38 PM

Thanks Florian,

Can u add to the information by suggesting the optimal value of
maxswapchunks?

My system info is:-
B.11.11 U 9000/800

Thanks for the help extended.
Anunay

#4 (**permalink**) 01-16-2008, 07:38 PM

Hi

> Can u add to the information by suggesting the optimal value of
> maxswapchunks?
As I wrote: 1 swapchunk corresponds to 2MB swap.

So it depends on how large your swap shall be. If you will have 1
gigabyte swap, you have to set this parameter to 512

Florian.

#5 (**permalink**) 01-16-2008, 07:38 PM

Florian Anwander wrote:
> Hi
>
>
>> Can u add to the information by suggesting the optimal value of
>> maxswapchunks?
>
> As I wrote: 1 swapchunk corresponds to 2MB swap.

Only with the default value of swchunk (2048).

The formula is:
System Swap = maxswapchunks * swchunk * 1k

maxswapchunks has an upper bound of 16384, so you need to account
for that if you want to go above 32Gb of swap and raise swchunk.

http://docs.hp.com/en/TKP-90202/re38.html

Don

> So it depends on how large your swap shall be. If you will have 1
> gigabyte swap, you have to set this parameter to 512

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Increasing swap space on HP B.11.11 machine.