Chris Harms wrote:
We went with 2 APC remote power switches. The ports can be grouped
together so you can turn off multiple ports at the same time to combat
redundant power supplies keeping the machine on. Just remember to
have the cluster use the same IP address to connect to the APC device
for each node so they can't both be fenced simultaneously. The APC
software only allows one session at a time so the second node will be
blocked from accessing it on the same IP.
Be careful with port groups. In the quick bit of testing I did with my
7920s, if I unplugged the network cable on the 2nd PDU (the one that my
nodes were not accessing for control) it said that it turned off the
port, but the 2nd PDU still had both ports on (for obvious reasons)
Which would quickly lead to a corrupted filesystem...
I personally use this config for my nodes (this allows for the cluster
to know if fencing failed on either controller, and not continue in that
case):
<device name="left" port="2" option="off"/>
<device name="right" port="2" option="off"/>
<device name="left" port="2" option="on"/>
<device name="right" port="2" option="on"/>
Thanks,
Eric Kerin
eric@xxxxxxxxxxx
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