[Linux-cluster] Fence device, How it work

[nattapon viroonsri]

I tend to use APC AP7900 as fence device.

So when failover have occure  backup node control  APC to power cycle 
failnode.
But im not sure how kind of  this device work .
Is it  just power off or power cycle at outlet that fail node was pluged ?
If so failnode was shutdown  or reboot uncleanly ? (look like no ups when 
have no power)
Im afraid of data corrupt may occur.

Or cluster manager instruct failnode to shutdown before instruct APC to 
power cycle ? ( So it reboot or shutdown cleanly)

Nattapon,
Regards

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