HP XP7 PA Software Installation Guide

Example 1 Determining the disk space requirements for HP XP7 Performance Advisor
Consider that the XP7 and the XP disk arrays, P9500 and XP24000 are monitored by
the HP XP7 Performance Advisor management station.
– P9500 Disk Array details:
– LDEVs = 1703
– PORTs = 96
– Dkc_Collection_frequency = 300 seconds (5 * 60)
– Ldev_Collection_frequency = 600 seconds (10 * 60)
– Port_Collection_frequency = 600 seconds (10 * 60)
Free_Space required for P9500 Disk Array data in HP XP7 Performance Advisor =
[(86400/600) *1703 * 0 .0002] + [(86400/ 600) * 96 * 0.00008] +
[(86400/300) * 0.0002] = 49.04 + 1.1 + 0.05 = 50.19 MB
– XP24000 Disk Array details:
– LDEVs = 2554
– PORTs = 32
– Dkc_Collection_ frequency = 300 seconds (5 * 60)
– Ldev_Collection_ frequency = 900 seconds (15 * 60)
– Port_Collection_ frequency = 600 seconds (10 * 60)
Free_Space required for XP24000 Disk Array data in HP XP7 Performance Advisor =
[(86400/900) *2554 * 0 .0002] + [(86400/ 600 ) * 32 * 0.00008
]+[(86400/300) * 0.0002] = 49.03 + 0.36 + 0.05 = 49.45 MB
Consolidated free space required in HP XP7 Performance Advisor (MB/day) = 99.64
MB (50.19 MB + 49.45 MB)
Preparing the XP, P9000 or the XP7 disk arrays and determining their data collection
schedules
• To achieve the optimal CHIP port (MP) performance utilization for an XP disk array or the MP
blade utilization for an XP7 disk array, HP recommends using two command devices that
connect through two different ports for the performance data collection. For more information,
see “Creating and assigning command devices to host agents” (page 37).
• To collect performance data of RAID groups (RAID groups, snapshot, ThP, external RAID
groups) and the journal volumes, HP recommends using a command device and port that are
not shared with other critical applications. This is because collecting performance data for
RAID groups is an intensive operation. You can create another schedule to collect performance
data for the remaining set of components through a different command device and port.
• Stagger schedule: If the data collection frequency is set to 15 minutes, performance data
collection occurs at every quarter hour, irrespective of when the schedule is created. For
example, if the schedule is created at 10:12 a.m., the first collection occurs immediately and
the next collection occurs at the quarter of the hour, which is 10:15 a.m. The subsequent
collections occur at 10:30 a.m., 10:45 a.m., and so on.
If you select the Stagger Schedule check box, performance data collection occurs every 15
minutes from the time the schedule is created. For example, if the schedule is created at 10:12
a.m., the first collection occurs immediately and the next collection is 15 minutes later, which
is at 10:27 a.m., and subsequent collections every 15 minutes after that. The Stagger schedule
ensures that the load on Performance Advisor at any point in time is balanced because data
24 Understanding the HP XP7 Performance Advisor installation prerequisites