HP XP P9500 Storage - Manual (Page 14)

To maintain pair consistency within the storage system, it is possible to do the following by using;
•
When creating a Cnt Ac-S pair with Remote Web Console, the created Cnt Ac-S pair can be
registered in a specific consistency group automatically. If a Cnt Ac-S pair is suspended for
any reason, all of the Continuous Access Synchronous P-VOLs registered in this specific
consistency group will be suspended.
•
When RCU detects that all of the connections for MCU are disconnected, all the Continuous
Access Synchronous S-VOLs registered in the specific consistency group will be changed to
PSUE status.
•
When creating a Continuous Access Synchronous pair with Remote Web Console the created
Continuous Access Synchronous pair can be registered in a specific consistency group
automatically. If a Continuous Access Synchronous pair is suspended for any reason, all of
the Continuous Access Synchronous P-VOLs registered in this specific consistency group will
be suspended.
•
When RCU detects that all of the connections for MCU are disconnected, all the Continuous
Access Synchronous S-VOLs registered in the specific consistency group will be changed to
PSUE status.
Interfaces
You perform Continuous Access Synchronous operations using of the following interfaces:
•
Remote Web Console, a browser-based interface from which Continuous Access Synchronous
can be setup, operated, and monitored. The GUI provides the simplest method for performing
operations, requiring no previous experience.
◦ The primary system must be LAN-attached to a Remote Web Console computer.
◦ The secondary system should also be LAN-attached to a separate Remote Web Console
at the remote site. This allows you to perform operations more efficiently on the secondary
system in the event that the main site is not available.
•
RAID Manager is a command line interface used to display pair information and perform all
copying and pair-managing operations. RAID Manager provides a full scripting capability
which can be used to automate replication operations. RAID Manager is required for performing
failover operations.
Failover software
Host failover software is used to transfer information between host servers at the local and remote
sites. It is a critical component of any disaster recovery solution.
•
When Continuous Access Synchronous is used as a disaster recovery tool, host failover is
required to insure effective recovery operations.
•
When Continuous Access Synchronous is used as a data migration tool, host failover is
recommended.
Continuous Access Synchronous does not provide host-failover functions. Use the failover software
most suitable for your platform and requirements (for example, Microsoft Cluster Server).
Overview of initial, update copy operations
When you perform the initial copy operation, all the data in the P-VOL is copied into the S-VOL.
Thereafter, Continuous Access Synchronous and the primary and secondary systems execute update
copy as often as updates are sent by the host. The update operation copies host updates to the
S-VOL at the same time that they are copied to the P-VOL.
The following illustrates the initial and the update copy operations.
14 Continuous Access Synchronous overview