HP StorageWorks XP24000 for FlashCopy Mirroring Software User's Guide (T5240-96001, June 2007)
Notes:
• When background copying processing of Version 2 is suppressed by the FCv2 Slower Copy2
option, the time taken for background copying increases. However, since the background copying
processing tim e of relationships is not always the same, note that the background copying
processing time will not necessarily quadruple.
• If Business Copy pairs or Version 1 relationships exist in the same parity group, host I/O
responses might not be improved.
Cautions on Turning O ff the Power While Using Version 2
The following explains what happens if you power off the storage system during Version 2 operations
and later power on the subsystem. What happens depends on the status of the shared memor y when
powering on the s ubsystem.
Warning:
If data on the shared memory is volatilized and lost after the power turns on, problems m ay
occur during operations. To avoid possible problems, withdraw as many relationships as possible before
powering off the subsystem.
• If data on t
he shared memory is not volatilized and not lost:
The status b efore p owering off will be maintained. As for the relationships in COPY mode,
background copying will automatically restart when you power on the subsystem.
• If data on t
he shared memory is volatilized and lost:
If
relationships exist before powering off the subsystem, the T-VOLs will become blocked and
inaccessible from the hosts when you power on the subsystem. Thus, the host does not access the
inconsistent data in the T-VOLs. To restore the T-VOLs to normal status, force the restoration of
the
LDEVs
.
Note that if the T-VOL is an external volume, the storage system may start normally and the
T-VOL may not become blo cked even if d a ta on the shared memory is lost. However, although
the
storage system starts normally, data in the T-VOL m ay not be normal. Therefore, you should
delete d ata in the T-VOL or initialize the T-VOL.
Installing and Uninstalling Version 2
This section describes how to install and uninstall Version 2.
For details about the license o peration, see the HP StorageWorks XP24000 Remote Web Console
User’s Guide.
Instal
ling
Version 2
This se
ction describes how to install Version 2. The installation steps are different depending on whether
Versio
n 1
is installed. Note that you do not need to complete step 2 and step 3 if you do not have
Version 1 installed.
To install Version 2:
1. Check
whether there is a need to install additional sha red memory or not.
For details, contact your HP service representative.
2. Withdraw all the relationships to delete Version 1 relationships.
Use
Re
mote Web Console or the host command to select and delete all the settings that use
Version 1.
3. Check that all the Version 1 relationships are deleted.
You ca
n
use Remote Web Console or the FCQUERY command to check if all the
Version 1 relationships are deleted. For details about the FCQUERY command, see
“Viewing Information for Version 2 Relationships”onpage96.
4. Set the devices used by Version 1 offline.
5. Ente
r
the license key for Compatible FlashCopy in the Remote Web Console window.
6. Click Apply in the Remote Web Console window.
64
Preparing for V ersion 2 Operations