HP StorageWorks XP Remote Web Console Software - Manual (Page 20)

20 Using XP Performance Control
13. For instructions on measuring traffic (for example, I/O and transfer rates), see the HP StorageWorks
XP Auto LUN user guide for the specific array.
Analyzing traffic statistics
With one-to-one connections, traffic statistics consist of the number of I/Os made via ports and the amount
of data transferred via ports. Analyze traffic statistics to determine upper limit values that should be
applied to I/O or transfer rates for non-prioritized ports.
With many-to-many connections, traffic statistics consist of the number of I/Os made via ports from HBAs
and the amount of data transferred between ports and HBAs. Analyze traffic statistics to determine upper
limit values that should be applied to I/O or transfer rates for low-priority HBAs.
The following is the procedure for using the XP Performance Control pane to analyze traffic statistics. Note
that you can also use the Auto LUN pane to analyze traffic statistics. XP Auto LUN/Performance Base
Monitor displays a line graph indicating traffic changes. (For more information, see the HP StorageWorks
XP Auto LUN user guide for the specific array.)
1. Start XP Performance Control (” Starting XP Performance Control ” on page 15). The XP Performance
Control pane appears.
2. Click Port (for a one-to-one connection) or WWN (for a many-to-many connection).
3. Select All from the list at the top right corner of the pane.
4. Do either of the following:
• To analyze I/O rates, select IOPS from the list at the upper-left corner of the table.
• To analyze transfer rates, select MB/s in the Port tab or 100KB/s in the WWN tab from the list at
the upper-left corner of the table.
The table displays traffic statistics (for example, I/O or transfer rates).
5. Analyze the information in the table, and determine upper limit values that should be applied to
non-prioritized ports or WWNs. If necessary, determine threshold values that should be applied to
prioritized ports or WWNs. For details, see ” Procedure for one-to-one connections between HBAs and
ports ” on page 8 (for ports) or Procedure for many-to-many connections between HBAs and ports ,
page 9 (for WWNs).
Setting upper limit values for traffic at non-prioritized ports or WWNs
After analyzing traffic statistics about prioritized and non-prioritized ports and WWNs, you must set
upper limit values to I/O or transfer rates. Upper limit values for I/O rates suppress the number of I/Os
from low-priority host servers, which provides better performance for high-priority host servers. Upper limit
values for transfer rates suppress the amount of data that should be transferred between the array and
low-priority ports, which provides better performance for high-priority host servers.
1. Start XP Performance Control (” Starting XP Performance Control ” on page 15). The XP Performance
Control pane appears.
2. Click Port (for a one-to-one connection) or WWN (for a many-to-many connection).
3. Do either of the following:
• To limit the I/O rate, select IOPS from the list at the upper-left corner of the table.
• To limit the transfer rate, select MB/s (or 100KB/s for WWNs) from the list at the upper-left corner
of the table.
4. Locate the non-prioritized port or WWN.
The Attribute column indicates whether ports or WWNs are prioritized or non-prioritized. If you
cannot find non-prioritized ports or WWNs, check the list at the top right corner of the pane. If it
displays Prioritize, select All or Non-Prioritize from the list.
5. Do either of the following:
• To limit the I/O rate, double-click the desired cell in the IOPS column in Upper, and enter the upper
limit in the cell.
• To limit the transfer rate, double-click the desired cell in the MB/s column (or 100KB/s column for
WWNs) in Upper, and enter the upper limit in the cell.
The upper limit value you entered is shown in blue.