202 Chapter 4 Performing CCI Operations
4.7.1 Recovery in Case of SVOL-Takeover
While the DC1 is conducting processing (normally state = 4), and when the DC2 has
recovered from the failure, the following commands must be issued to make PVOL on the
DC1 side:
In case of operations on the DC1 side:
c pairsplit -S
d paircreate -vl
e pairevtwait (wait for PAIR)
In case of operations on the DC2 side:
c pairsplit -S
d paircreate -vr
e pairevtwait (wait for PAIR)
Host A
PVOL
PSUS
DC2
Host B
SMPL
DC1
State No. 4
Host A
SMPL
DC2
Host B
SMPL
DC1
State No. 1
c
pairsplit -S
Host A
SVOL
COPY
DC2
Host B
PVOL
COPY
DC1
State No. 15
d
paircreate -vl
Host A
SVOL
PAIR
DC2
Host B
PVOL
PAIR
DC1
State No. 16
e
pairevtwait
Host A
PVOL
PAIR
DC2
Host B
SVOL
PAIR
DC1
State No. 16
horctakeover
After operations (state is No.16), when the DC2 takes over processing from the DC1, the
horctakeover command will execute a swap-takeover operation due to (DC2)SVOL &
(DC1)PVOL_PAIR on the (DC2) side.
If the DC1 side has NO this operation, and when the DC2
takes over processing from the DC1, horctakeover command
will be returned with EX_VOLCRE due to (DC2)PVOL &
(DC1)SMPL on the (DC2) side.
Æ state is No. 10.
In this case, pairvolchk (-s) command will be returned with
PVOL_PSUS on the (DC2) side, and pairvolchk (-s -c)
command will be returned with SMPL on the (DC2) side.
Host A
PVOL
PSUS
DC2
Host B
SMPL
DC1
State No. 10
