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204 Chapter 4 Performing CCI Operations
In case of state No. 17:
This case is pair suspend (using pairsplit command) by
operator. The DC1 takes over processing from the DC2,
when the DC2 has PSUS state DC1(SVOL-PSUS) & DC2(PVOL-
PSUS) that will be needed that ask operator for decision,
and/or pairresync on the DC1 side. If the DC1 takes over
processing from the DC2 without their confirmation
operations, horctakeover command will be returned with
SVOL_E (execute SVOL-takeover and return EX_VOLCUR)
on the (DC1) side.
Æ state is No. 17.
Host A
PVOL
PSUS
DC2
Host B
SVOL
PSUS
DC1
State No. 17
Consideration as for state No. 9
The horctakeover command will be failed with EX_ENORMT on the following nested failure
case (state No. 4
Æ9). Therefore, HA Control Script will be needed that ask operator for
decision, and do nothing on the DC1 side.
Host A
Host B
PVOL
SVOL
DC2
DC1
Host C
Host A
Host
B
PVOL
SMPL
DC2
DC1
Host
C
Host A
Host B
P
vol
SMPL
DC2 DC1
Host
C
DC2 site failure
Host B failure
State No. 16
State No. 23
Æ
4
State No. 4
Æ
9