Hitachi TAGMASTORE MK-90RD011-25 - Manual (Page 223)

Hitachi Command Control Interface (CCI) User and Reference Guide 205
4.7.2 PVOL-PSUE-Takeover
The horctakeover command executes PVOL-PSUE-takeover when the primary volume cannot
be used (PSUE or PDUB volume is contained in the group, or the link down that the pair
status is PVOL_PAIR/SVOL_PAIR and the AP (active path) value is 0), and will be returned
with “PVOL-PSUE-takeover” as the return value. PVOL-PSUE-takeover changes the primary
volume to the suspend state (PSUE or PDUB Æ PSUE*, PAIR Æ PSUS) which permits WRITE to
all primary volumes of the group.
Host C Host A Host B
PSUS
PSUE*
PSUS
PSUE*
PSUS
PAIR
PAIR
PAIR
PAIR
PAIR
horctakeover
P-VOL
ESCON ® or Fibre-
channel failure
Host C Host A Host B
PAIR
PSUE
PAIR
PSUE
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
S-VOL P-VOL S-VOL
The horctakeover command will be returned with PVOL-PSUE-takeover also on the following
nested failure case.
Host C Host A Host B
PSUS
PSUE*
PSUS
PSUE*
PSUS
PAIR
PAIR
PAIR
PAIR
PAIR
horctakeover
P-VOL
Host failure after
ESCON ® /fibre failure
Host C Host A Host B
PSUS
PSUE*
PSUS
PSUE*
PSUS
PAIR
PAIR
PAIR
PAIR
PAIR
S-VOL P-VOL S-VOL