单选题A cluster indicates that a remote site has failed. What facilities exist in HACMP/XD://HAGeo to ensure that the failure is not just a TCP/IP communication failure？（）A Electronic Service Agent software provides a redundant heartbeat between sites.B A non-IP network and Dial Back Fail Safe provide redundant heartbeats between sites.C The GeoMirror Devices provide a link validation facility that guarantees the validity between sites.D The Site Notification Daemon maintains a heartbeat between sites via short haul Modems/line drivers and dark fibre.
单选题
A cluster indicates that a remote site has failed. What facilities exist in HACMP/XD://HAGeo to ensure that the failure is not just a TCP/IP communication failure？（）
A
Electronic Service Agent software provides a redundant heartbeat between sites.
B
A non-IP network and Dial Back Fail Safe provide redundant heartbeats between sites.
C
The GeoMirror Devices provide a link validation facility that guarantees the validity between sites.
D
The Site Notification Daemon maintains a heartbeat between sites via short haul Modems/line drivers and dark fibre.
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