HP XP P9500 Storage - Manual (Page 42)

LUN Expansion
LUSE volumes can be assigned to Continuous Access Synchronous pairs, with the following
restrictions:
•
The P-VOL and S-VOL must have the same LU type and the same number of LDEVs.
•
If you need to perform LUSE operations on an existing Continuous Access Synchronous P-VOL
or S-VOL, you must release the pair first to return the volume to SMPL status.
•
If you allocate a LUSE volume that consists of LDEVs set across more than one CU to the
Continuous Access Synchronous pair, you must select CU Free for an RCU.
For further information about LUN Expansion (LUSE), see the HP XP P9000 Provisioning for Open
Systems User Guide.
LUN Manager
•
LUN Manager operations do not affect Continuous Access Synchronous operations.
•
Volumes that are under secure ports and/or that are assigned to host groups can also be
assigned to Continuous Access Synchronous pairs.
•
Volumes that are assigned to Continuous Access Synchronous pairs can also be assigned to
secure ports and host groups for LUN Manager.
•
Continuous Access Synchronous S-VOLs cannot be accessed by any UNIX/PC server host
except when the pair is split.
For more information, see the HP XP P9000 Provisioning for Open Systems User Guide.
Performance Monitor
Performance Monitor software provides detailed information about I/O activity and hardware
performance in XP P9500 systems. Storage system usage and performance data is collected and
displayed by Performance Monitor. This information helps you to:
•
Identify the optimum timing for performing Continuous Access Synchronous operations.
•
Determine the best locations for the Continuous Access Synchronous S-VOL (for example,
parity groups with less-frequently accessed volumes to avoid bottlenecks of backend activity).
•
Monitor system performance during Continuous Access Synchronous operations and during
testing activities.
Procedure 6 To reduce performance impact on Continuous Access Synchronous operations
1. If Performance Monitor is collecting large amounts of LDEV data, disable this activity for one
or more storage systems.
2. If Performance Monitor is collecting data for more than three storage systems on the XP
P9500-internal LAN, disconnect Performance Monitor, if possible, from one or more storage
systems before using Continuous Access Synchronous.
3. When Continuous Access Synchronous operations are completed, Re-enable Performance
Monitor data collection.
See the HP XP P9000 Performance for Open and Mainframe Systems User Guide for more
information.
42 Sharing Continuous Access Synchronous volumes