|
Measures reported by UspLdevDetailsTest
Performance Monitor displays the average and maximum usage, including sequential and random access, of each logical volume (LDEV) in a parity group. The logical volume usage is the time in use (sequential and random access) of the physical drives of each LDEV, averaged by the number of physical drives in the parity group. If the monitor data shows overall high logical volume usage, you should consider installing additional hardware (e.g., HDDs, disk adapters, cache). If the monitor data shows the imbalance volume usage, you can use Volume Migration to migrate high-usage volume to higher HDD classes and/or to lower-usage parity groups. The logical volume usage data can also be used to analyze the access characteristics of volumes and determine the appropriate RAID level and/or HDD type for the volumes.
This test is used to identify the I/O activity, and overall health of the Ldev Details.
The measures
made by this test are as
follows:
| Measurement |
Description |
Measurement
Unit |
Interpretation |
| IOPS |
This measure indicates
the number of read and write operations of the Ldev Detail per second.
|
IOPS |
|
| TransRate |
This measure indicates
size of data of the Ldev Detail that has been transferred per second .
|
KB/sec |
|
| Read_IOPS |
This measure indicates
the number of read operations of the Ldev Detail per second.
|
IOPS |
|
| Write_IOPS |
This measure indicates the number of write operations of the Ldev Detail per second.
|
IOPS |
|
| Read_Hit |
This measure indicates the read hit ratio of the Ldev Detail in percent.
|
% |
|
| Write_Hit |
This measure indicates the write hit ratio of the Ldev Detail in percent.
|
% |
|
| C2D_Transfer |
This measure indicates the number of data of the Ldev Detail that has been transferred between cache memories and disk drives.
|
Number |
|
| Response_Time |
This measure indicates the response time of the Ldev Detail at logical volumes in Microseconds.
|
Microseconds |
|
| Backtrans |
This measure indicates the number of data of the Ldev Detail that has been transferred between cache memories and disk drives per second.
|
Number/sec |
|
|