HP LeftHand SAN Solutions Support Document - Application Notes - Best Practices for Enabling Microsoft Windows with SAN/iQ®

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Monitoring More Than One Server Simultaneously
When collecting data from multiple servers, you can collect all data from a
single perfmon instance by changing the server name in the “Select counters
from computer:” box. The appropriate physical drives will show up for
that server.
Scheduling Performance Data Collection
Data collection can be scheduled using the Performance Monitor tool.
To enable scheduling, right-click on a log that has been created, and select
“Properties”. Go to the “Schedule” tab to set up the start and stop time for the
performance data logging. The most value comes from a schedule that
encompasses typical workloads, so it is suggested that the schedule be set to
include times with peak loads, such as backups, end-of-week batch processing
jobs, or other times when the SAN is heavily utilized. Depending on the
individual environment, this schedule could last for 24 hours to one week.
Typically, logging of less than 24 hours does not represent a comprehensive
workload.