HP StorageWorks P9000 Performance Advisor Software v5.2 Install Guide (T1789-96317, May 2011)

• SECONDS_PER_DAY = 86400
The consolidated free space that is available for P9000 Performance Advisor is the total sum
of the free space available on all the XP and the P9000 disk arrays monitored by P9000 Per-
formance Advisor.
Example 1. Determining the disk space requirements for P9000 Performance Advisor
Consider that the P9000 and the XP disk arrays, P9500 and XP24000 are monitored by the
P9000 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 on P9500 Disk Array = [(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 on XP24000 Disk Array = [(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 that is available for P9000 Performance Advisor (MB/day) = 99.64
MB (50.19 MB + 49.45 MB)
Preparing the XP or the P9000 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 a P9000 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 presenting command devices to hosts” on page 36.
• 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
Understanding the P9000 Performance Advisor installation prerequisites22