[Linux-HA] crm_mon equivalent for serial and udp communications

[Matt Zagrabelny]

On Fri, 2008-05-30 at 07:01 -0500, Matt Zagrabelny wrote:
> On Fri, 2008-05-30 at 11:47 +0200, Dejan Muhamedagic wrote:
> > On Fri, May 30, 2008 at 09:34:34AM +0200, Robert Heinzmann (ml) wrote:
> > > >We just developed the tool what you say.
> > > >See attached. It's a screen shot of it.
> > > >How about it?
> > > 
> > > Is there a command line tool on the current code base showing this
> > > information (maybe not as integrated in crm_mon as your tool) ?
> > 
> > There's cl_status hblinkstatus.
> 
> Perfect. Thanks Dejan.

Well *almost* perfect.

It looks as though there is some discrepancies in the reporting (or in
my understanding).

I have a two node cluster (squash and turnip).

+------------+           +------------+
| /dev/ttyS1 |  <====>   | /dev/ttyS1 |
|            |           |            |
|  squash    |           |  turnip    |
|            |           |            |
|     eth2   |  <====>   |   eth2     |
+------------+           +------------+

From squash I run:

squash% cl_status hblinkstatus squash /dev/ttyS1
dead

squash% cl_status hblinkstatus turnip /dev/ttyS1
up

squash% cl_status hblinkstatus squash eth2
up

squash% cl_status hblinkstatus turnip eth2
up

From turnip I run:

turnip% cl_status hblinkstatus squash /dev/ttyS1
up

turnip% cl_status hblinkstatus turnip /dev/ttyS1
dead

turnip% cl_status hblinkstatus squash eth2
up

turnip% cl_status hblinkstatus turnip eth2
up

So, a node will report that its own serial line is 'dead' but report
that its partner's is 'up'. Is this by design?

I would think that if heartbeat can see the correct data on the serial
line that *both* serial links would report 'up'.

From the logs I get:

(on squash)
heartbeat[2677]: 2008/05/30_07:43:52 info: Link turnip:/dev/ttyS1 up.

(on turnip)
heartbeat[6429]: 2008/05/30_07:43:52 info: Link squash:/dev/ttyS1 up.

Thanks for any information,

-- 
Matt Zagrabelny - mzagrabe at d.umn.edu - (218) 726 8844
University of Minnesota Duluth
Information Technology Systems & Services
PGP key 1024D/84E22DA2 2005-11-07
Fingerprint: 78F9 18B3 EF58 56F5 FC85  C5CA 53E7 887F 84E2 2DA2

He is not a fool who gives up what he cannot keep to gain what he cannot
lose.
-Jim Elliot
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