Error detection/correction and fault detection/recovery – Data processing system error or fault handling – Reliability and availability
Reexamination Certificate
2004-07-16
2009-12-01
Baderman, Scott T (Department: 2114)
Error detection/correction and fault detection/recovery
Data processing system error or fault handling
Reliability and availability
C714S010000, C714S043000
Reexamination Certificate
active
07627780
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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Baderman Scott T
Dot Hill Systems Corporation
Lavan Thomas J.
Schell Joseph
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