On Mon, 2005-11-07 at 11:37 +0000, nattapon viroonsri wrote: > 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 ? Power-cycle. > If so failnode was shutdown or reboot uncleanly ? (look like no ups when > have no power) It is an "unclean" power-off. > Im afraid of data corrupt may occur. Most journalled file systems will just replay the journal and life will continue after it reboots. > Or cluster manager instruct failnode to shutdown before instruct APC to > power cycle ? ( So it reboot or shutdown cleanly) It does not instruct the node to shut down. It turns off the power to the node. When a node appears down, it is currently assumed that we can no longer communicate with it, so telling it to shut down will not work. (This isn't always the case, but for now, this is how it works.) -- Lon -- Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
