Overview

Connections between Primary and Secondary on 41XX ports are never closed and increase endlessly until the number of open sockets reaches the 65K limit, at which point there is severe performance degradation when all the connections are depleted.

Customers encountering this known issue may want a way to track the number of orphaned connections between the primary and secondary node in a HA deployment.

Solution

This known issue (SCALEARC-20957) was resolved in ScaleArc 2021.1 release which is now available on the Release Portal.

For customers running older versions, the number of connections between Primary and Secondary can be manually tracked with the following command from an SSH session to the ScaleArc server:

sudo netstat -apln | grep idblb | grep -v LISTEN | grep :4 | wc -l

If you wish to see the connections details, you can get the list by executing the following command:

sudo netstat -apln | grep idblb | grep -v LISTEN | grep :4

The number of connections between the Primary and Secondary ScaleArc nodes should not be higher than 40000 to avoid issues.