Understanding Controllers

Understanding Controllers

Controller Objects in the VPSA represent the clustered virtual controller pair of a VPSA.

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Failover

Failover halts the active controller and activates the standby controller with minimal I/O interruption.

Viewing Controller Properties

Properties

Each Controller displays the following Properties:

Property Description
ID Controller name (which is automatically assigned)
Target The iSCSI qualified name (IQN)
WWPN1 Worldwide name of the FC virtual HBA
WWPN2 Worldwide name of the FC virtual HBA
IPSec Key IPsec Key for secured iSCSI connectivity over IPSec
Encryption Set  
VPSA CHAP User iSCSI CHAP authentication user name. For use when setting global CHAP on servers
VPSA CHAP Secret iSCSI CHAP authentication password. For use when setting global CHAP on servers
Cache Size Size of Flash Cache of this VPSA
Heartbeat1 Heartbeat status between 2 virtual controllers
Heartbeat2 Heartbeat status between 2 virtual controllers
Software Version Virtual Controller SW build version

Paths

This tab lists all the paths between this virtual controller and the attached servers. If multipathing is set each server will show all paths, along with the number of active sessions.

For iSCSI connections the initiator and target IQNs are listed.

For Fibre Channel connections the initiator and target WWPN are listed.

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System Usage

The System Usage Charts provide live metering of the consumption of compute resources on the selected Controller.

The charts display the usage data as it was captured in the past 20 “intervals”. An interval length can be set to one of the following: 1 Second, 10 Seconds, 1 Minute, 10 Minutes, or 1 Hour. The Auto button lets you see continuously-updating live metering info (refreshed every 3 seconds).

System Usage includes the following charts, detailed in the table below:

Chart Description
CPU Usage (%) Average usage of all CPU cores
Memory Usage (%) Used memory out of available controller memory
Bandwidth (KB\s) Total networking traffic (in KB) of read and write SCSI commands issued to the Controller, per second.
SSD Cache Usage (%) Amount of Flash Cache used

Cache Metering

The Metering Charts provide live metering of the IO workload associated with Flash Cache of the selected Controller.

The charts display the usage data as it was captured in the past 20 “intervals”. An interval length can be set to one of the following: 1 Second, 10 Seconds, 1 Minute, 10 Minutes, or 1 Hour. The Auto button lets you see continuously-updating live metering info (refreshed every 3 seconds).

Controller metering includes the following charts:

Chart Description
IOPs The number of read and write SCSI commands issued to the Flash Cache of the Controller, per second.
Bandwidth (MB\s) Total throughput (in MB) of read and write SCSI commands issued to the Flash Cache of the Controller, per second.
IO Time (ms) Average response time of all read and write SCSI commands issued to the Flash Cache of the Controller, per selected interval.
Hit Rate (%) Read and write cache hit-rate during the selected interval.

Logs

Displays all event logs associated with the selected Controller.

Performance Alerts

The Alerts tab lists the configurable alerts of the selected Controller:

  • Average CPU Usage in the last minute is above the given threshold
  • Average memory consumption in the last minute is above the given threshold