Dell PowerFlex 4.6.x Technical Overview

SDC connection monitoring

The system monitors all connections between SDCs and SDSs and sends out an alert when an active connection between an SDC and an SDS goes down.

To monitor SDC and SDS connections effectively, the MDM collects connectivity updates from all of the SDCs. The MDM posts events whenever an SDC connects to or disconnects from a specific SDS IP address. The MDM frequently analyzes the connectivity status to determine the current system state. The system does not send out alerts for temporary connectivity issues that are resolved in less than 10 seconds.

The following are the possible connectivity states between SDCs and SDSs in the system:

• All connected
• One SDC is disconnected from one SDS
• One SDC is disconnected from one SDS IP address
• One SDC is disconnected from all SDSs
• All SDCs are disconnected from one SDS
• All SDCs are disconnected from one SDS IP address
• All SDCs are disconnected from all SDSs
• Multiple disconnections

When the connectivity state of the system changes to any state other than All Connected, an alert is displayed in PowerFlex Manager and is written to the MDM event log. Once an alert is generated, you can use the SCLI to query details on the disconnection using the command scli --query_sdc_to_sds_disconnections.

The MDM does not monitor the connectivity state of SDCs or SDSs in the following scenarios:

• SDS is in maintenance mode
• SDS is disconnected from the MDM
• SDS is in the process of being removed
• SDC is disconnected from the MDM for more than two minutes
• SDC is not approved