Lun Load Test
This test monitors the I/O activity on each LUN on the storage device, and reveals the LUN that is experiencing the maximum throughput.
Target of the test : A Hitachi AMS storage device
Agent deploying the test : A remote agent
Outputs of the test : One set of results for each LUN on the storage device monitored.
| Parameter | Description |
|---|---|
|
Test Period |
How often should the test be executed. |
|
Host |
The IP address of the storage device. |
|
UnitName |
Specify the name of the storage unit to be monitored. To determine the unit name registered with the Storage Navigator Client for the AMS SAN device, run the following commands, one after another, from the C:\Program Files\Storage Navigator Modular CLI directory on the Storage Navigator Client: startnsmen auunitref The output of the command includes the Name of the storage unit. DF700M_75011118 is a sample unit name. |
|
MCType |
Indicate the machine type. The value can be AMS or WMS. By default, this parameter is set to AMS. |
|
SNClientLocation |
Specify the full path to the install directory of the storage navigator. |
|
Timeout |
Indicate the duration (in minutes) for which this test should wait for a response from the storage device. By default, this is set to 5 minutes. |
| Measurement | Description | Measurement Unit | Interpretation |
|---|---|---|---|
|
IO rate |
Indicates the number of read/write commands executed on this LUN per second. |
IOPS |
If this measure reports a high value or if the value of the measure increases consistently, it is indicative of unusually high I/O activity on this LUN. Comparing the value of this measure across LUNs can accurately indicate which LUN is currently experiencing heavy workloads. Observing the variations in this measure over a period of time will enable you to figure out bottlenecks in load balancing. |
|
Read rate |
Indicates the number of read operations performed on this LUN per second. |
IOPS |
|
|
Write rate |
Indicates the number of write commands issued on this LUN per second. |
IOPS |
|
|
Read hit |
Indicates the percentage of read requests that were served from this LUN. |
Percent |
Ideally, the value of this measure should be high. A low value is a cause for concern, as it could indicate that a majority of the read requests have failed. |
|
Write hit |
Indicates the percentage of data written to this LUN. |
Percent |
Ideally, the value of this measure should be high. A low value is a cause for concern, as it indicates that data is not getting written to the LUN; this could be owing to an I/O bottleneck, which might have to be investigated. |
|
Data transfer rate |
Indicates the transfer size of read/write commands per second. |
KB/sec |
|
|
Read transfer rate |
Indicates the transfer size of read commands per second. |
KB/sec |
|
|
Write transfer rate |
Indicates the transfer size of write commands per second. |
KB/sec |
|
|
Tag count |
Indicates this LUN’s current tag count. |
Number |
|
