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Hitachi Command Control Interface (CCI) User and Reference Guide 219
4.10 Performing Hitachi TrueCopy Takeover Operations
The Hitachi TrueCopy takeover command (horctakeover) is a scripted command for
executing several Hitachi TrueCopy operations. The takeover command checks the specified
volume’s or group’s attributes (paircurchk), decides the takeover function based on the
attributes, executes the chosen takeover function, and returns the result. The four Hitachi
TrueCopy takeover functions designed for HA software operation are (see section 4.10.1):
takeover-swit
ch, swap-takeover, PVOL-takeover, and SVOL-takeover. A paired volume or a
group can be specified as the target of the TrueCopy takeover command. If SVOL-takeover is
specified for a group, the data consistency check is executed for all volumes in the group,
and all inconsistent volumes are found in the execution log file and displayed (same as
paircurchk command).
The takeover command allows swapping of the primary and secondary volumes, so that if
the primary or secondary volume is switched due to a server error or package transfer,
duplex operations can be continued using the reversed volumes. When control is handed
over to the current node, swapping the volumes again eliminates the need to copy them.
The takeover command also allows the secondary volume to be separated for disaster
recovery operations.
Table 4.21 lists and describes the horctakeover command p
arameters and returned values.
Table 4.22 lists and describes the error code
s for the horctakeover command.
Table 4.21 Horctakeover Command Parameters
Parameter Value
Command Name horctakeover
Format horctakeover { -h ⎪ -q ⎪ -z ⎪ -g <group> ⎪ -d <pair Vol> ⎪ -d[g] <raw_device> [MU#] ⎪
-d[g] <seq#> <LDEV#> [MU#] ⎪ -S ⎪ -l ⎪ -t <timeout> ⎪ -nomsg }