how to reinitialize swapon with out rebooting mserver

[Thummalu]

Hi, I have added a secondary swap swap2 in /dev/vg00 and started the swap using swapon -a command.

Now I have extended the swap2 by lvextend command. Now if I try to run swapon -a, I am getting the following message.

root% swapon -au
Enabling device paging on /dev/vg00/swap2.
swapon: /dev/vg00/swap2 is already enabled for paging.

How to reinitialize the swap.

any help is highly appreciated.

br
thummalu

[Arunvijai_4]

Have a look at these threads, it should provide enough information,

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=962784
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=977181
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=110613

-Arun

[Thummalu]

Thanks Arun.

But will it be possible to force it with out rebooting the server?

br
Thummalu

[Sivakumar TS]

Could you try swapon -f

[Arunvijai_4]

# swapon -f should do the job.

-Arun

[Thummalu]

No,

it did not worked

root% swapon -f /dev/vg00/swap2
swapon: /dev/vg00/swap2 is already enabled for paging.

Am I missing some thing else?

Br
Thummalu

[RAC_1]

It would not be possible. Once you turned it on and later increased the size. Reboot would do it.

[Steven E. Protter]

Shalom thummalu,

Swap changes require a boot.

Thats the way the OS works.

Sorry.

SEP

[Bill Hassell · Accepted solution]

swap space is not changeable once it has been enabled. The reason is that the structures are integrated into the kernel memory maps. If you were to use lvreduce on an active swap space, the system would likely crash when the missing space is accessed. It isn't necessary to extend a swap area, just add another swap lvol.

[Thummalu]

Hi,

Fine and thanks for the answers. I will do a reboot and check the status.

br
Thummalu

[Thummalu]

After reboot swap size got increased