On 2016-09-05 03:04, Ulrich Windl wrote:
Marek Grac <mg...@redhat.com> schrieb am 03.09.2016 um 14:41 in
Nachricht
<CA+40=jws_6hjglajcszaqa6o9rqh79oa9aq150z1+5kjst_...@mail.gmail.com>:
Hi,
There are two problems mentioned in the email.
1) power-wait
Power-wait is a quite advanced option and there are only few fence
devices/agent where it makes sense. And only because the HW/firmware
on the
device is somewhat broken. Basically, when we execute power ON/OFF
operation, we wait for power-wait seconds before we send next command.
I
don't remember any issue with APC and this kind of problems.
2) the only theory I could come up with was that maybe the fencing
operation was considered complete too quickly?
That is virtually not possible. Even when power ON/OFF is
asynchronous, we
test status of device and fence agent wait until status of the
plug/VM/...
matches what user wants.
I can imagine that a powerful power supply can deliver up to one
second of power even if the mains is disconnected. If the cluster is
very quick after fencing, it might be a problem. I'd suggest a 5 to 10
second delay between fencing action and cluster reaction.
Ulrich, please see the response I just posted to Marek. Thanks!
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