Hitachi TAGMASTORE MK-90RD011-25 - Manual (Page 245)

Hitachi Command Control Interface (CCI) User and Reference Guide 227
4.10.2 Applications of the Horctakeover Command
The basic Hitachi TrueCopy commands (takeover, pair creation, pair splitting, pair
resynchronization, event waiting) can be combined to enable recovery from a disaster,
backup of paired volumes, and many other operations (e.g., restoration of paired volumes
based on the secondary volume, swapping of the paired volumes). Figure 4.25 illustrates the
flow of starting operations on a UNIX server at the secondary site using the Hitachi TrueCopy
horctakeover command. Figure 4.26 illustrates the flow of starting operations on a Windows
server at the secondary site using the horctakeover command.
1. horctakeover Communication with the primary site
is disabled. Accordingly, SVOL-takeover is executed
SVOL-SSUS-takeover. The secondary volume is
R/W-enabled.
2. vgchange -a e
The LVM is activated in exclusive mode, and the svol
server gets the right to use. The svol accepts R/W.
3. fsck
Conformability of the file system is checked.
4. mount
The file system is mounted for R/W.
5. Server software activation
The server DB software is activated, and the
database is rolled back and rolled forward.
6. Application activation
The user program is activated.
Takeover
Command
1. horctakeover
2. vgchange -a e
3. fsck
4. mount
5. Server software activation
6. Application activation
User’s Shell Script
User’s Environment
Activation from
HA software
Manual activation
Activation from
Remote Console
Execution
Log
S-VOL
SMPL or SVOL_SSUS
End of pairing.
R/W is enabled.
HORC
Manager
Figure 4.25 Application/Example of TrueCopy Takeover (UNIX-based System)