Monitoring SwapSpace on SLES systems

Hi,

I have a question regarding monitoring of swap files / swap partitions on 
Linux servers.
I'd like to get information about swap files / swap partitions via the 
check_disk command.

Like shown in the example below there exists a swap partition on the 
server as /dev/sda2:



But when trying to monitor this partion via check_disk the output is:



Is there any error in the syntax and is it possible in general to get 
information about the (physical) usage of swap files / partitions via 
check_disk or does this command not support these kind of files / 
partitions ?
Do I have any other options to get the required information with one of 
the Nagios plugins ?

Thanks in advance for your help.

Kind regards
Frank Schweitzer