System information

Using the RAID GUI
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2.11 Performance Management
2.11.1 Hard disks
This feature allows you to enable, disable, or reset disk IO logging for all hard disks.
When hard disk IO logging is enabled, the following data will be displayed. You can press the Reset button to clear all
statistics except outstanding IO and disk utilization to zero.
2.11.2 Cache
This feature allows you to enable, disable, or reset buffer cache IO logging.
When cache IO logging is enabled, select the cache type (volume, logical disk, or JBOD disk) to be displayed from the
drop-down menu. The following IO statistics will be displayed. You can press the Reset button to clear all statistics except
dirty buffer and clean buffer to zero.
Category Display
HDD ID Hard disk identifier
Read Command (sector)
The number of read commands executed since the disk was powered on
The accumulated transfer size of read commands since the disk was powered on
Write Command (sector)
The number of write commands executed since the disk was powered on
The accumulated transfer size of write commands since the disk was powered on
Response Time (ms)
The average command response time since the disk was powered on
The maximum command response time since the disk was powered on
Outstanding IO
The number of current outstanding IO in the disk
The number of current outstanding IO in the controller’s IO scheduler queue
Disk Utilization
The disk utilization in the last second
The disk utilization in the last five seconds
Note
When the redundant-controller system is in use, all the statistics information of the hard disks in
both controllers (Controller A and B) will be displayed on the screen.
Category Display
ID Cache identifier
Read Command (sector)
The number of read commands executed since the disk was powered on
The accumulated transfer size of read commands since the disk was powered on
Write Command (sector)
The number of write commands executed since the disk was powered on
The accumulated transfer size of write commands since the disk was powered on
Read Cache Hit The number of cache hits by read commands since the system was powered on
Merged Write The number of merged writes (write hits) since the system was powered on
Dirty Buffer The number of dirty buffers in the cache at present
Clean Buffer The number of clean buffers in the cache at present