Apparatus and method for deterministically performing active-active failover of redundant servers in a network storage appliance
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United States of America Patent
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Dec 1, 2009
Grant Date -
Sep 22, 2005
app pub date -
Jul 16, 2004
filing date -
Apr 23, 2003
priority date (Note) -
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Abstract
An apparatus for deterministically performing active-active failover of redundant server blades hot-pluggable into a backplane of a network storage appliance chassis is disclosed. Each server monitors the other's heartbeat on a respective path in the backplane. Other paths between the two servers on the backplane enable one server to reliably kill the other server and take over its identity on the network in response to detecting a stopped heartbeat of the other server. The apparatus is superior to a conventional heartbeat link between servers in separate chassis, such as an Ethernet cable, because it is not prone to user removal or damage since the backplane cannot be removed by a user while the appliance is operational and enables each server to know a true heartbeat failure has occurred, as opposed to failure of a conventional external heartbeat link causing each server to each think the other has failed.
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