7 usage scenarios, Data – HP StorageWorks XP Remote Web Console Software User Manual
Page 144
7 Usage Scenarios
This chapter describes several usage scenarios for XP Continuous Access.
•
“Data Migration Using XP Continuous Access Synchronous” (page 144)
•
“Point-in-Time (PiT) Data Duplication Using XP Continuous Access Asynchronous” (page 145)
•
“Using XP Continuous Access for Disaster Recovery Operations” (page 145)
Contact your HP service representative for further information on Business Continuity and Disaster
Recovery Solutions from HP.
Data Migration Using XP Continuous Access Synchronous
When you need to migrate data for any of the following reasons, XP Continuous Access Synchronous
can be used for the data migrated to the other volume.
•
To load data onto new or scratch volumes (for example, new or upgraded storage system),
•
To temporarily move data off an LU to accommodate other activities (for example, repair), or
•
To relocate LUs to balance workloads and distribute I/O activity evenly within and across
storage systems for the purpose of improving storage system and system performance.
The XP Continuous Access initial copy operation copies the entire contents of the P-VOL to the
S-VOL. The P-VOL and S-VOL are identical and synchronized when the initial copy operation
completes and the pair status changes from COPY to PAIR. The XP Continuous Access pair is then
released to change the state of the devices to SMPL. Host high-availability (HA) software can then
be used to complete the data migration non disruptively. To support host-based application
automation, data migration using XP Continuous Access must be managed by integrating the RAID
Manager software with XP Continuous Access operations and host HA software functions.
If you need to migrate data from other vendors’ storage systems onto the storage system, contact
your HP service representative.
To use XP Continuous Access Synchronous to migrate data from one volume to another:
1.
Vary the S-VOL(s) offline from all attached hosts. The S-VOLs are the target volumes onto which
you are migrating the data. The P-VOLs (source volumes) can remain online.
2.
Connect to the storage system containing the volume(s) to be migrated, and then start the XP
Continuous Access software. If not already done, install the remote copy connections and
configure the initiator port (if migrating between storage systems), and then add the RCUs.
3.
On the XP Continuous Access main window, select the desired CU, select the LU(s) to be
migrated, and start the XP Continuous Access Synchronous pair(s) (see
).
4.
Monitor the progress of the initial copy operation(s) and the status of the pair(s) on the XP
Continuous Access main window. Refresh the window as needed. When the status has changed
from COPY to PAIR, the P-VOL and S-VOL are identical and synchronized.
5.
If you are not using RAID Manager commands and host software to complete the migration,
use the following procedure to stop using the P-VOL(s) and switch to the S-VOL(s):
a.
Stop all host updates to the P-VOL(s).
b.
When all update activity to the P-VOL(s) has stopped, connect to the MCU, select the
correct CU, and release the XP Continuous Access pair(s) (see
).
c.
If the P-VOL(s) and S-VOL(s) are attached to the same host, vary the P-VOL(s) offline first,
and then vary the S-VOL(s) online. The P-VOL(s) and S-VOL(s) have the same volume labels
and cannot be online to the same host(s) at the same time.
d.
To keep the volumes synchronized, establish the same XP Continuous Access pair(s) in
the reverse direction using the None initial copy option (see
144 Usage Scenarios