HP XP Array Manager Software User Manual
Page 37
If you select connected parity groups in the tree, the list displays statistics about disk access
performance for all the connected parity groups.
Note:
When you select a folder icon such as Box 1 or Box 3, the concatenated parity group icon
is displayed in a list. The only parity group ID displayed will be that of the group at the top of
the concatenated parity groups. The icon used for concatenated parity groups is the same as a
regular parity group icon. There is no specific icon for concatenated parity groups.
•
The Draw button displays a line graph that illustrates changes in the I/O rate, the transfer rate,
etc. The graph can display up to eight lines simultaneously.
•
The line graph illustrates changes in the I/O rate, the transfer rate, etc. The vertical axis indicates
the usage rates (in percentage). The horizontal axis indicates dates and/or times.
If you select connected parity groups in the tree, the graph illustrates changes in disk access
performance (for example, the I/O rate and the transfer rate) for all the connected parity groups.
Before clicking the Draw button, you should use the drop-down list at the right corner of the
list (just below the drop-down list for specifying the type of statistics) to specify the type of
information that will be displayed in the graph. The drop-down list to specify the item to be
displayed is shown below.
Figure 10 Selecting an Item to be Displayed in the Graph (LDEV Tab)
The items that can be selected in the drop-down list changes depending on the type of statistics
you selected. Some items can be selected only when you select I/O rate (IOPS) or the transfer
rate (MB/s). The items you can select in the drop-down list and the corresponding type of statistics
are shown in
Table 4 The Items You Can Select in the Drop-Down List and the Types of Statistics
(LDEV Tab)
Item selected in the
drop-down list
Meaning
Type of statistics
I/O rate transfer
rate
IO Rate
The I/O rate. The number of I/O accesses per
second).
Read
The number of read accesses per second.
Write
The number of write accesses per second.
Read Hit
The read hit ratio.
Write Hit
The write hit ratio.
Back Trans.
Backend transfer. The number of data transfers
between the cache memory and the hard disk drive.
Trans.
The transfer rate. The size of data transferred per
second.
: Can be selected (blank): Cannot be selected
XP24000 Performance Monitor User's Guide
37