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Performance Monitor monitors volumes in parity groups and displays statistics about the average and the maximum usage rate in a specified period. Performance Monitor also displays a graph that illustrates changes in volume usage within that period.

To view usage statistics about volumes in a parity group:

1. Ensure that the Auto LUN window is displayed.

2. In the tree, click the Physical tab

3. In the list above the tree, select the storing period of statistics from longrange and shortrange for display.

For details on the types of storing period of statistics, see “Understanding Statistical Storage Ranges” on page 16.

When you view usage statistics about volumes, some items displayed in the list differ depending on the selection of the storing period: longrange or shortrange. To use XP Auto LUN to migrate volumes, select longrange. This enables you to confirm the estimated usage rate of parity groups after migration.

For more information on using XP Auto LUN, see the HP StorageWorks XP24000/XP20000 Auto LUN Software User Guide.

To examine the ratio of XP Business Copy processing and so on to all the processing in the physical drive, select shortrange.

The usage statistics for a same term might be slightly different between selecting shortrange and longrange because the monitoring precision of these two interval types differs. Especially, differ-ences in read rates and write rates between the interval types are larger than other usage statistics.

4. In the tree, double-click the Parity Group folder.

The folder opens and a list of parity groups is displayed below the folder.

5. Select the desired parity group.

The list on the right displays usage statistics about volumes in the specified parity group. The displayed statistics are the average and the maximum usage rates for the period specified in the From and To boxes.

NOTE:

• The list displays up to a maximum of 4,096 resources at a time. If the number of resources exceeds 4,096, use Previous and Next to display the remaining resources.

• If you change the date and time in the From and To boxes and then click the Apply button, Performance Monitor recalculates usage rates and updates information in the list. To change the date and time in From and To boxes, use the arrow buttons and the sliders (for details, see “Auto LUN Window, Physical Tab” on page 31).

• If an exclamation mark (!) is displayed before a usage rate, the reported volume usage rate is likely to be inaccurate, because the configuration has changed (for example, volumes have been moved by XP Auto LUN or XP Business Copy, or formatted by Virtual LVI or Open Volume Management).

For more information on using XP Auto LUN, see the HP StorageWorks XP24000/XP20000 Auto LUN Software User Guide.

• If a plus mark (+) is displayed before a usage rate 0, such as +0, the usage rate is not com-pletely 0 but less than 1.

6. To display a graph that illustrates changes in usage rate for volumes, select the desired volumes in the list and then click the Draw.

NOTE:

The range of monitoring and the gathering interval affects the time period represented by a graduation on the horizontal axis.

When selecting longrange for storing period of statistics:

When selecting shortrange for storing period of statistics:

Figure 21 Examples of Volume Usage Rates Displayed

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NOTE:

• It is possible that the sum of the usage rate for each volume in a parity group is not equal to the usage rate for that parity group (see “Viewing Usage Statistics about Parity Groups” on page 61).

This is because the Auto LUN window rounds off fractions below the decimal point to the nearest whole number when displaying the usage rate for each volume.

• If the CU is not the monitoring target, all items in the row are displayed in italics. To monitor those items, you must specify the CU as the monitoring target by using the Monitoring Option window.

The list displays the following items:

• : When the green checkmark icon is displayed on the left of a volume, the graph illustrates changes in usage rate for the volume.

• LDEV: This column indicates volumes (LDEVs). The number on the left of the first colon from the left is the LDKC number. The number on the left of the second colon from the left is the CU image number. The number on the right of the second colon is the LDEV number.

• Emulation: This column indicates device emulation types.

• Usage:

• The Ave. (Total) column displays the average usage rate in the specified period.

• The Max. column displays the maximum usage rate in the specified period.

• Read Rate:

• The Rnd. column indicates random read rates. A random read rate is the ratio of random read requests to read and write requests.

• The Seq. column indicates sequential read rates. A sequential read rate is the ratio of sequential read requests to read and write requests.

• Write Rate:

• The Rnd. column indicates random write rates. A random write rate is the ratio of random write requests to read and write requests.

• The Seq. column indicates sequential write rates. A sequential write rate is the ratio of sequential write requests to read and write requests.

• Parity Gr. Use[Exp]: This item is displayed only when you select longrange for the storing period of statistics. Parity Gr. Use[Exp] assumes the volume might be migrated out of the parity group (or uninstalled) and indicates expected (estimated) average and maximum usage rates of the parity group. The Ave. (Total) column indicates an estimated change in the average usage rate. The Max. column indicates an estimated change in the maximum usage rate.

For example, if the Ave. (Total) box for the volume 0:01 displays 20 -> 18, the average usage rate of the parity group that the volume belongs to is 20 percent. If the volume were migrated out of the parity group, the average usage rate of that group is expected to drop to 18 percent.

• Business Copy: This item is displayed only when you select shortrange for the storing period of statistics. Business Copy indicates the percentage of the processing of the following programs to all the processing of the physical drives, for each volume. This value is found by dividing access time to physical drives by the following programs by all the access time to physical drives.

• ShadowImage for Mainframe

• XP Business Copy

• HP StorageWorks XP for FlashCopy Mirroring Software

• HP StorageWorks XP for FlashCopy Mirroring V2 Software

• XP Auto LUN (For more information on using XP Auto LUN, see the HP StorageWorks XP24000/XP20000 Auto LUN Software User Guide)

• XP Snapshot

The Ave. (Total) column displays the average percentage of processing of the above programs in the specified period.

The Max. column displays the maximum percentage of processing of the above programs in the specified period.

For details on the above programs, see their respective user's guides.

• CLPR: This column indicates numbers and names of CLPRs corresponding to each parity group which the volume belongs to, in the format CLPR-number:CLPR-name. For details on CLPRs, see HP StorageWorks XP24000/XP20000 Disk/Cache Partition User Guide.