Hitachi G1000, User Manual

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1
.
The primary system cannot communicate over the data path and writes
this status to the quorum disk.
2
.
When the secondary system detects from the quorum disk that a path
failure has occurred, it stops accepting read/write.
3
.
The secondary system communicates to the quorum disk that it cannot
accept read/write.
4
.
When the primary system detects that the secondary system cannot
accept read/write, the primary system suspends the pair. Read/write
continues to primary storage system.
If the primary system cannot detect from the quorum disk that the secondary
system cannot accept I/O within five seconds of a communication stoppage,
the primary system suspends the pair and I/O continues.
If both systems simultaneously write to the quorum disk that communication
has stopped, this communication stoppage is considered to be written by the
system with the smaller serial number.
Related topics
• I/O stoppage detected in the counterpart system on page 1-18
• I/O stoppage not detected in the counterpart system on page 1-19
I/O stoppage detected in the counterpart system
When a stoppage is detected within 5 seconds in the counterpart system, the
pair volume that will continue to receive read/write after the stoppage is
determined based on the pair status:
• When the pair status is PAIR, read/write continues to the volume that
wrote the communication stoppage to the quorum disk.
1-18
Overview of global-active device
Hitachi Virtual Storage Platform G1000 Global-Active Device User Guide