HP StorageWorks XP Remote Web Console Software - Manual (Page 154)

If more than one primary and secondary storage systems is used with extended consistency groups,
you must split all data volume pairs in the extended consistency groups before powering off the
secondary storage systems. When powering off the secondary storage systems, you must power
off the supervisor DKC first, and then the subordinate DKCs.
If the delta resync function to support the remote command devices is used, the SIM (SIM reference
code = EFD0) to suggest that the device connected to the external storage system has been blocked
is reported to the destination storage systems because the command devices are blocked due to
the power-off of the storage system.
CAUTION: To power off the secondary storage system, contact your HP service representatives
and ask them to power off the storage system.
If data volume pairs are split and the secondary storage system is powered off as mentioned above,
you can resume remote copy operations by taking the following steps:
1. Power on the secondary storage system.
If more than one secondary storage system is to be used with extended consistency groups,
power on the subordinate DKCs first, and then the supervisor DKC.
2. If the secondary storage system is ready to resume remote copy operations, restore the data
volume pairs that have been split, and then confirm that the status of the data volume pairs is
Pending orDuplex. This operation must be performed at the primary site.
After you take these steps, remote copy operations will be resumed. The secondary storage system
will be able to issue read journal commands to the primary storage system.
NOTE: To power off both the primary and secondary storage systems at the same time, see the
next section.
IMPORTANT: If you turn the power off without changing the status of all data volume pairs to
Suspend, and then you turn the power back on, the status of all data volume pairs could be
suspended according to a failure.
Powering Off the Primary and Secondary Storage Systems at the Same Time
To power off the primary and secondary storage systems at the same time, the primary storage
system must be powered off before the secondary storage system is powered off. To power on the
primary and secondary storage systems again, the secondary storage system must be powered
on before the primary storage system is powered on.
If more than one primary and secondary storage systems are used with extended consistency
groups, you must first power off all the primary storage systems, and then the secondary storage
systems. When you power on the primary and secondary storage systems again, you must first
power on all the secondary storage systems, and then the primary storage systems.
The following is the procedure for powering off the primary and secondary storage systems at the
same time:
1. Split data volume pairs that will be affected by powering off the primary and secondary
storage systems.
For example, if two primary storage systems and one secondary storage system are connected
to each other and you want to power off one of the primary storage systems and the secondary
storage system, you must split data volume pairs that are defined between the remaining one
primary storage system and the primary storage system, because these data volume pairs will
be affected by powering off the storage systems.
2. After the splitting of the pairs finishes, confirm that the status of all the pairs is changed to
Suspend at the primary storage system.
3. Power off the primary storage system as described previously. Do not power on the primary
storage system yet.
154 Configuring Storage Systems and Logical Paths