Mirroring failover warnings RRS feed

  • Question

  • Hi Experts,

    we are having frequent failover warnings in mirroring, and the timeout were set to 10 seconds mostly, and customer says  "that the server is not timing out since I'm running a continuous ping from the abc (witness) server.

    Please give me more information in regards to the cause of fail over? what I assume is since the timeout is set to just 10 seconds it is causing frequent failover warnings, Please advice me.

    Here are few errors from errorlog:

    Database mirroring connection error 4 '64(The specified network name is no longer available.)' for 'TCP://abcdef.Big.ad.local:5022'.

    Error: 1474, Severity: 16, State: 1.

    Database mirroring connection error 4 'An error occurred while receiving data: '10054(An existing connection was forcibly closed by the remote host.)'.' for 'TCP://abcder.Big.ad.local:5022'

    Thanks in advance.

    Thursday, March 5, 2015 2:19 PM


  • Read the recommendations of configuring partner 


    If you plan to use high-safety mode with automatic failover, the normal load on each failover partner should be less than 50 percent of the CPU. If your work load overloads the CPU, a failover partner might be unable to ping the other server instances in the mirroring session. This causes a unnecessary failover. If you cannot keep the CPU usage under 50 percent, we recommend that you use either high-safety mode without automatic failover or high-performance mode.

    Did you check with n/w team? If its n/w dropout then you can expect the failover. Work with n/w team and see if they find any thing useful.


    If that is not the case,  Increase the timeout value to 20 seconds and see if this solves the problem.


    Thursday, March 5, 2015 5:48 PM