Viewing Workload Statistics On Lu Paths; Graphs That Illustrate Changes In Workloads On A Port; Detailed Information That Can Be Displayed In The Graph (Port-Lun Tab) - HP XP20000 User Manual
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For the period of 9:59 to 10:00, the maximum workload on CL1-A is 400 IO/s. The average
workload on CL1-A is 300 IO/s. The minimum workload on CL1-A is 200 IO/s (see the graph
on the right).
When Detail is deselected, only one line appears in the graph. This line is equivalent to the line
Ave. (1 min), which appears when Detail is selected.
Figure 14 Graphs that Illustrate Changes in Workloads on a Port
.
Viewing Workload Statistics on LU Paths
When you select LUN (
check box, the graph displays detailed statistics about workload on the LU path. The detailed statistics
that can be displayed differ depending on items you select in the list, as explained in
Table 5 Detailed Information that can be Displayed in the Graph (Port-LUN Tab)
Select Detail and this Item in the List
IO (the number of I/Os per second)
Read (the number of read accesses per
1
second)
Write (the number of write accesses per
1
second)
Read Hit (the read hit ratio)
Write Hit (the write hit ratio)
Back Trans. (backend transfer; the
number of I/Os between the cache
memory and hard disk drives)
1
You can select this item only when I/O rates are displayed.
48
Using the Performance Monitor Windows
) in the tree, select a LUN in the list. click Draw button, and then select Detail
The Graph Contains
1
Statistics in sequential access mode
Statistics in random access mode
If the read hit ratio or the write hit ratio is high, random access
mode is used for transferring data instead of sequential access
mode. For example, random access mode is likely to be used
for transferring data to disk areas to which the Cache Residency
Manager function is applied.
The number of data transfers from the cache memory to hard
disk drives (Cache to Drive)
The number of data transfers from hard disk drives to the
cache memory in sequential access mode (Drive to Cache
Seq.)
The number of data transfers from hard disk drives to the
cache memory in random access mode (Drive to Cache
Rnd.)
Table
5.
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