HP XP P9500 Storage - Manual (Page 52)

5. Click Finish.
6. In the Confirm window, confirm the settings, in Task Name type a unique name for this task
or accept the default, and then click Apply.
If Go to tasks window for status is checked, the Tasks window opens.
Changing the processor blade assigned to an LDEV
1. In the Remote Web Console main window, in the Storage Systems tree, select Logical Devices.
LDEVs are shown in the LDEVs tab.
2. Select the LDEV for which you want to change the processor blade.
3. Click More Actions, and then select Assign MP Blade.
4. In the Assign Processor Blade window, specify the processor blade in Processor Blade.
5. Click Finish.
6. In the Confirm window, confirm the settings, in Task Name type a unique name for this task
or accept the default, and then click Apply.
If Go to tasks window for status is checked, the Tasks window opens.
CAUTION:
•
The processor blade assigned to the LDEV is used as a utility volume for Compatible XRC and
can be changed only when the XRC session is suspended and the number of the side files of
the target session is zero.
•
Changes to the processor blade ID of an LDEV should be made during off-peak hours when
the I/O load is as low as possible. Before and after changes are made, it is recommended
that the cache write-pending rate (%) for all CLPRs is lower than 50%. Do not change the
processor blade ID when the I/O load is high -- for example during an initial copy operation
of Business Copy Z, Continuous Access Synchronous Z, or Continuous Access Journal Z.
•
When you change the processor blade ID of an LDEV, you should use Performance Monitor
before and after the change to check the load status of devices. Do not change several LDEV
processor blade IDs during a short period of time. As a guideline, you can change 10% or
less of the total number or the full workload of LDEV processor blade IDs assigned to the same
processor blade ID at the same time.
•
After you change the processor blade ID of an LDEV, wait more than 30 minutes before you
try to change the ID again for the same LDEV.
Using a system disk
A system disk is a special LDEV used in the storage system for specific purposes. A system disk is
not required in a storage system, but is recommended for buffering of the audit log. A system disk
should not be used for storing user data. After a system disk is created, the system knows what
types of information the system disk is used for and all appropriate information is automatically
sent to the system disk.
For example, when the system disk is used as an audit log buffer, you set parameters to enable
the audit log buffer. The Audit Log feature recognizes the LDEV number of the system disk and then
accesses it as a buffer. The system disk must have sufficient capacity to accommodate the audit
log buffer. See the HP XP P9000 Audit Log User and Reference Guide for more information about
how to enable the audit log buffer.
To designate the system disk as the buffer area for audit logs, do one of the following:
•
In the Audit Log Setting window, set Audit Log buffer to Enable.
•
Set system option mode (SOM) 676 to ON.
52 Configuring custom-sized provisioning