Resource Monitor

Resource Monitor allows you to monitor the CPU usage, memory usage, disk utilization and network flow. You can choose to monitor in real time or view the previous data.

Note: Previous data will be shown if Enable usage history is ticked in the Advanced Settings tab.

Performance

Click on Performance tab to view the resource utilization data. Detailed date, time and information of the chart will be shown upon mouseover.

CPU

You can see the overall CPU usage of User, System and I/O Wait. CPU load could be high when Resource Monitor is first launched, because the system needs to collect its resource data and load the UI page at the same time.

User shows the percentage of CPU used to run user applications. System shows the percentage of CPU used in the core of the system, hardware/software IRQs. I/O Wait shows the percentage of CPU spent on I/O wait.

Utilization is the sum of User and System CPU usage.

The Load Average within 1, 5, and 15 minutes is displayed, showing the run-queue length (i.e. the sum of the number of processes that are currently running plus the number that are waiting to run).

Term Explanation

Memory

The overall memory usage of physical memory and swap space will be shown. Memory usage remains high because the system stores frequently accessed data in cache, so the data can be quickly obtained without accessing the hard disk. Cache memory will be released when overall memory is insufficient.

High swap space usage indicates insufficient system memory, and will also affect the system performance. You can view the rate of swap in and swap out by choosing Swap from the drop-down menu on the top.

Disk

You can choose to view the overall disk utilization, transfer rate or IOPS by clicking the drop-down menu at the top of the chart. You can click View All at the bottom to select more disks by ticking the checkboxes to add their data to the chart.

Volume/iSCSI

This page displays the overall transfer status of volumes and iSCSI LUN (Block-Level). Click the drop-down menu above the chart to view transfer utilization, transfer rate, or IOPS. Click the View All button to select individual volumes or iSCSI LUN (Block-Level) and add them to the chart.

Volume/iSCSI

This page displays the overall transfer status of volumes and iSCSI LUN (Block-Level). Click the drop-down menu above the chart to view transfer utilization, transfer rate, or IOPS. Click the View All button to select individual volumes or iSCSI LUN (Block-Level) and add them to the chart.

Network

The network flow chart displays the data sent and received rate in KB per second. If PPPoE is enabled, its transfer rate will also show up on the chart.

Process

Click on Process tab to view the CPU and memory usage of each process in the order of decreasing CPU load.

The process Status includes Running, Sleeping and Stopped. Linux equivalents of process status are running, stopped/tracing, sleeping.

Sleeping can be followed by a letter for detailed information, e.g. 'D' for disk sleep, 'Z' for zombie, 'X' for dead.

Current Connections

Under the Current Connections tab, you can manage the list of users who is currently accessing RackStation resources.

To manage current connections, do any of the following:

Speed Limit

Under the Speed Limit tab, you can view and manage the list of file transfer processes that applied speed limit on RackStation.

To refresh the list:

Click Refresh to reload the page and get the most updated records.

To stop a file transfer process:

Click Kill connection to stop the file transfer. You will have to start the file transfer again to complete the process successfully.

Advanced Settings

Click Advanced Settings to set up following options:

Click Apply to save the settings.