Hitachi VSP F1500 User And Reference Manual page 235

• Script: Shell script that automatically performs takeover process when CM
detects the server failure.
In an HA environment, a package is a group of applications that are scripted
to run on the secondary host in the event of a primary host failure. When
using the HA software (for example, MC/ServiceGuard), the package can be
transferred to the standby node as an operation executed by the system
administrator (see Figure 6-6 Package transfer on high availability (HA)
software on page 6-11).
Note: If the operation is performed when CCI and TrueCopy are being used,
the volume is switched from primary to secondary as if an error had
occurred, even though data consistency is assured. When restoral of the
original node occurs along with its original package (group of applications), it
is necessary to copy the data on the secondary volume onto the primary
volume; this operation can take as much time as the initial copy operation for
the pair. In actual operation, no package can be transferred when TrueCopy
is being used. The secondary package is switched to the primary package,
and vice versa, when the primary volume is switched to the secondary
volume. Therefore, the primary and secondary TrueCopy volumes should be
switched depending on the package state.
Figure 6-6 Package transfer on high availability (HA) software
The swap option of the takeover command allows swapping of the primary
and secondary volume designations, so if the primary and secondary volume
are switched due to a server error or package transfer, pair operation can be
continued using the reversed volumes. When control is handed back over to
the original node, swapping the volume designations again eliminates the
need of copying them. In addition, the takeover command has the option to
allow the secondary volume to be logically separated (for the purpose of
recovery from a disaster at the original operating site). The takeover
command has four functions designed for HA software operation:
Takeoverswitch, swap-takeover, SVOL-takeover, and PVOL-takeover. This
command is not available for ShadowImage.
Data replication operations with CCI
Command Control Interface User and Reference Guide
6-11