HP StorageWorks XP Performance Advisor Software v4.6 User and Troubleshooting Guide (T1789-96094, June 2010)

• In a Multipathing environment, ensure that a command device is not exposed to a host from 2
different ports. This stops the current performance data collection, as the schedule configured to
obtain the collection is automatically deleted.
• HP recommends that you set the data collection rate to one hour or less because of management
station performance and field rollover. XP Performance Advisor collects performance data on all
LDEVs in the XP array that communicate with the management station through their respective
hosts. The hosts that display their status as Received under the Host Information tab constitute the
superset of mapped LDEVs. Performance data collection is not limited to the number of LDEVs that
the host station is mapped to use. Setting the collection rate too narrow (less than 5 minutes) results
in reduced responsiveness from the management station.
• If you split the External RAID Group, RAID Group, XP Thin Provisioning pool, and Snapshot into
two schedules, you cannot see the Total I/O, Total MB/s, and Total Tracks fields in the LDEV table.
• If you split Journal LDEVs, External RAID Group, RAID Group, XP Thin Provisioning pool, and
Snapshot into two schedules, and in Charts, you select All from the LDEV drop-down box, the
combined data points from both the schedules are plotted on the chart. In addition, repeated
timestamps are displayed if the collection frequency for both the schedules is the same. As a result,
incorrect values are plotted on the graph. For more information about charts, see “Plotting
charts” on page 213. For details on the XP arrays supporting XP Thin Provisioning (THP), Snapshot,
and XP Continuous Access Journal, see “Appendix D” on page 347.
• If you are collecting performance data for the first time, it takes longer than usual for XP Performance
Advisor to collect the data. Subsequent performance data collection on the XP array is as per the
time specified in the Frequency section.
• If you have performed a one-time configuration data collection and later the XP array configuration
has changed, HP recommends that you perform a fresh configuration data collection, so that the
performance data that you collect is for the new configuration.
Initially, when performance data collection is not yet configured for XP arrays, the following details
are displayed in the Performance Collection table, under the Performance Collection tab:
DescriptionScreen elements
Displays the DKC number of the XP array.Array
Displays the system name of the host.Host ID
Displays the ports that are configured to communicate data between the
command device on an XP array and the associated host.
Port
Displays the LDEV ID of the LDEV that is configured as a command device.Cmddev
Displays the device file for the command device.DeviceFile
No schedule name.Schedule Name
Displays 0,0,0Frequency (DKC, RG, Port)
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