[Nagiosplug-devel] check_swap on solaris with metadisk

[Ben O'Hara]

On 6/13/06, Ton Voon <tonvoon at mac.com> wrote:
>
> I'm keen on getting check_swap working well on Solaris, but it's hard
> getting a decent system to develop on.
>

If you need anything testing we have a few solaris boxes i can run some
tests on for you.


> Which version of the plugins are you using? I think you are using a
> pre-1.4 version as we no longer use the swap -s routine.
>

Im fairly sure its later than 1.4, although cant be 100% sure.

Please try the snapshot at http://nagiosplug.sourceforge.net/snapshot.
>


Ill give this a whirl and let you know how it goes.

Cheers

Ben


Ton
>
> On 13 Jun 2006, at 10:34, Ben O'Hara wrote:
>
> On 6/13/06, Thomas Sluyter <tsluyter at kilala.nl> wrote:
> >
> > On 13 Jun, 2006, at 10:27, Ben O'Hara wrote:
> >
> > > db5# swap -l
> > > swapfile             dev  swaplo blocks   free
> > > /dev/md/dsk/d20     85,20     16 2097392      0
> > >
> > > db5# swap -s
> > > total: 3431360k bytes allocated + 34488k reserved = 3465848k used,
> > > 820608k available
> >
> > From the man-page of "swap":
> > > The blocks column from swap -l reports:
> > > The swaplen  value  for  the  area  in  512-byte blocks.
> >
> > Also from that man-page:
> > > The allocated column from swap -s reports:
> > > The  total  amount  of  swap  space in   bytes currently allocated
> > > for use as backing store.
> >
> > So there's a discrepancy right there.
> >
> > How could your swap partition be 2.097.392 * 512 (about 1G) in size,
> > when you have a total of over 3.4G in use? Swap -l does indeed report
> > that there are zero blocks free... Odd.
> >
> > Could it be that you defined a non-default block size when creating
> > the swap space? Something like ~2048 per block? Could be that "swap -
> > l" doesn't actually report the size in 512 blocks, but in the -real-
> > size blocks. If check_swap was relying on swap -l , then the
> > calculation would be off as well... Seems like this might be a bit of
> > a bug in Solaris' "swap -l" command?
> >
> > Anywho, looking at my own systems the combination of "df -k" and
> > "swap -s" seems to be the more reliable way of telling the real swap
> > usage.
> >
> > So instead of the output of "metastat" I'm more curious about the
> > output of "df -k". This should show the size for your swap device in
> > kB (look for /var/run)...
> >
> > Now, if "df -k" supports your claim that swap space is 4G in size I'd
> > wager that check_swap was using the "swap -l" approach, while it
> > could be making better use of the "swap -s" way.
>
>
>
> Hi Thomas, thanks for the detailed reply.
>
> df -k is showing
>
> Filesystem            kbytes    used   avail capacity  Mounted on
> swap                  810152      24  810128     1%    /var/run
>
> Which seems to suggest swap is only 800MB with 1% used?
>
> The source for check_swap has the following
>
> #   ifdef sun
>         if (!allswaps) {
>                 asprintf(&swap_command, "%s", "/usr/sbin/swap -s");
>                 asprintf(&swap_format, "%s", "%*s %*dk %*s %*s + %*dk %*s
> = %dk
> %*s %dk %*s");
>                 conv_factor = 2048;
>         }
> #   endif
>
>
> Which to me suggests that its using swap -s for its calculations?
>
>
>
> There's more buginess in check_swap anyway... See below:
> > > JST $ ./check_swap -w 85% -c 95%
> > > Warning percentage should be more than critical percentage
> > > Usage:
> > > check_swap [-a] -w <used_percentage>% -c <used_percentage>%
> > > check_swap [-a] -w <bytes_free> -c <bytes_free>
> > > check_swap (-h | --help) for detailed help
> > > check_swap (-V | --version) for version information
> > >
> > > JST $ ./check_swap -w 15% -c 5%
> > > SWAP OK: 98% free (1360 MB out of 1391 MB) |swap=1360MB;208;69;0;1391
> > Meaning that the author got "used_percentage" mixed up with
> > "free_percentage"
>
>
>
> Hmm, maybe worth not using check_swap then!
>
> Cheers
>
> Ben
>
> Cheers!
> >
> >
> > Thomas
> >
> >
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> >
>
>
>
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-- 
"A Scientist will earn a living by taking a really difficult problem and
spends many years solving it, an engineer earns a living by finding really
difficult problems and side stepping them"
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