[Linux-HA] stonith device AP7920

[Werner Fischer]

> > The apcmastersnmp STONITH plugin has been tested with the AP7920.  Enjoy.
> Thank you for your answer I 'm going to buy one....

Keep in mind that this power switch can become a SPOF (as it has only
one power inlet!). If this single power-cable to the power switch fails,
everything is down. So if you need to buy a new power switch, I would
choose a different one.

For details about situations where a power switch can become a SPOF,
look at these postings:
http://lists.linux-ha.org/pipermail/linux-ha/2004-November/013051.html
http://lists.linux-ha.org/pipermail/linux-ha/2004-November/013055.html
http://lists.linux-ha.org/pipermail/linux-ha/2004-December/013100.html

After that discussion, I think that a WTI NPS-230 (see
http://www.wti.com/nps230.htm) would be much better for using in a
HA-cluster as it seems to be fully redundant (I think Alan suggested it
somewhere in the discussion above, but I didn't find the posting). This
power switch allows you to user two independent power circuits. So you
can connect each node (if it has dual power supplies) to both power
circuits and you are still able to use it with STONITH.
As far as I know, the WTI NPS-230 is supported by Heartbeat/STONITH.

greetings,
Werner