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3 Configuration and performance collection
• During configuration data collection, if you want to know the percentage of CHIP port utilization
(Micro Processor (MP)), HP recommends using the OutBand mode of configuration data collection.
• Avoid toggling the configuration collection between OutBand and InBand modes. Every time you
toggle between OutBand and InBand modes, you need to delete the existing performance
schedules and create new schedules after the configuration collection is complete. This is due to
the following reasons:
• If external RAID groups are connected to the array, the RAID group information collected
through OutBand and InBand modes differ. Hence, the schedules need to be recreated.
• You will be initiating new configuration collections whenever an array's configuration changes.
The existing schedules do not automatically take the new configuration information. Hence,
you will have to create new schedules to initiate the performance data collection again.
• To achieve the optimal CHIP port (MP) performance utilization, during performance data collection,
HP recommends using two command devices that connect through two different ports (two different
MPs).
To collect performance data of RAID groups (RAID groups, snapshot, THP, External RAID groups)
and journal components, 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 — a brief on when to use a 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. Subsequent collections occur at 10.30 a.m., 10.45 a.m., and
so on.
If you select the Stagger Schedule checkbox, 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 collection occurs
for all the XP and P9000 disk arrays not every 15 minutes of the hour, but at varied points of time
in the day.
• Host Agent minimum configuration
Following is the recommendation for a two minute collection interval:
• Install host agent on a server (preferably UNIX host) where P9000 Performance Advisor is not
installed
• Minimum 2GHz CPU speed
• Minimum 2GB RAM
• Minimum 3GB virtual memory (swap space)
• Minimum 100MB LAN speed
• Maximum 65,000 LDEVS for all the XP and P9000 disk arrays whose data is collected by the
host agent
HP StorageWorks P9000 Performance Advisor Software Best Practices Guide
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