HP StorageWorks XP Performance Advisor Software v4.6 Install Guide (T1789-96096, July 2010)

2. Increase the management and host agent configuration based on the number of LDEVs you require
and collection frequencies you want to set. The following items can help you estimate the
configuration you will need.
• To estimate the number of XP disk arrays that can be supported with one management server
and host agent:
Table 3 Large XP disk array configurations
ComponentsData Collection Fre-
quency
# LDEVs# Arrays
Managed
HostManage-
ment Sta-
tion
LDEVs45 minutes64K111
LDEVs30 minutes32K111
LDEVs10-15 minutes
32K (aggreg-
ated)
> 1 (2 to 3)1-31
For DKC and Ports, you must set the data collection frequency to 10 minutes.
• To estimate management server drive space required for the XP Performance Advisor database:
• HP recommends that there be at least a week's historic data available when you are
forecasting using charts or alarms.
• Determining disk space requirements:
Use the following formula to determine the disk space requirements for XP Performance
Advisor on a daily basis. The factors that influence the output are the number of: XP disk
arrays, LDEVs, ports, and DKC resources. Also, the performance data collection and fre-
quency influence the output.
Free_Space (MB/day for one array) = [(SECONDS_PER_DAY /
Ldev_Collection_frequency) * LDEVs * Ldev_Space ] +
[(SECONDS_PER_DAY / Port_Collection_ frequency) * PORTs *
Port_Space] + [(SECONDS_PER_DAY/ Dkc_Collection_ frequency) *
Dkc_Space]
where:
• Free_Space (MB/day) = Total free disk space (in MB) required for a day
• LDEVs = Total number of LDEVs of an array (includes journal volumes, pool volumes,
external volumes, and so on)
• PORTs = Total number of ports for an XP Disk Array
• Ldev_Collection_frequency = Collection frequency for LDEVs (in seconds)
• Port_Collection_frequency = Collection frequency for ports (in seconds)
• Dkc_Collection_ frequency = Collection frequency for dkc (in seconds)
• Ldev_Space ( per Ldev) = 0.0002 MB
• Port_Space (per port) = 0.00008 MB
• Dkc_Space (per collection) = 0.0002 MB
• SECONDS_PER_DAY = 86400
The consolidated free space that is available for XP Performance Advisor is the total sum
of the free space available on all the XP disk arrays monitored by XP Performance Advisor.
Example 1. Determining the disk space requirements for XP Performance Advisor
Consider that XP disk arrays 10055 and 10090 are monitored by the XP Performance
Advisor management station.
HP StorageWorks XP Performance Advisor Software Installation Guide 21