PowerVM

  • 1.  Safe to remove IP address on a running SEA in VIOS?

    Posted Tue March 09, 2021 11:24 PM
    I configured an IP address on my SEA when I created it (in a SEA failover configuration), is it safe to remove the IP address while the SEA and the VIO servers are already running? What is the proper way to do this?

    TIA,

    ------------------------------
    Carlo Castillo
    ------------------------------


  • 2.  RE: Safe to remove IP address on a running SEA in VIOS?

    User Group Leader
    Posted Wed March 10, 2021 12:07 AM
    Hi,
    Did you put the address on the SEA virtual adapter with mktcpip? (I usually recommend creating a separate virtual adapter for the VIO Server, not trunked, and put the VIO Servers address on that).

    Anyway have a look at the rmtcpip options, but note that this cannot be done the VIO Server is part of a cluster (for shared storage pools etc).  If you are changing address you can use the mktcpip command with the new address (but you may need to clean up your hosts file)

    Cheers,

    ------------------------------
    --------------------
    Antony Steel (Red)
    ===============
    ------------------------------



  • 3.  RE: Safe to remove IP address on a running SEA in VIOS?

    Posted Wed March 10, 2021 02:19 AM
    Thanks for replying!

    Yes, the IP address was configured on the SEA thru mktcpip.  No, there aren't any shared storage pools for this setup.  Is SSP the only thing that will make this part of a cluster, or is there anything else?  Not looking to change the IP, just looking to remove it from the SEA, as I already have a separate physical network interface that I want to assign the IP address to.  Will this be as simple as 'rmtcpip -f -interface entX' (as well as double check the hosts file as you said)?  As the server is already operational, can this be done without jeopardizing the internal LPAR's communications with the rest of the network?

    Cheers,

    ------------------------------
    Carlo Castillo
    ------------------------------



  • 4.  RE: Safe to remove IP address on a running SEA in VIOS?

    User Group Leader
    Posted Wed March 10, 2021 03:29 AM
    Hi Carlo,
    No problems!
    Since about version 2.2 you can create VIO Server clusters and servers using a shared storage pool must be part of the same cluster, but clusters don't have to have shared storage pools (lscluster with various flags).
    Some earlier versions of "rmtcpip -f interface enX" had some issues, but supported versions are now safe and only impact communications the VIO Server's using enX, not the clients being routed through the SEA.
    If you want to be cautious (and you have dual VIO Servers) you can fail the traffic over, then make your change, then move/balance the traffic back again.
    Cheers,

    ------------------------------
    --------------------
    Antony Steel (Red)
    ===============
    ------------------------------



  • 5.  RE: Safe to remove IP address on a running SEA in VIOS?

    Posted Wed March 10, 2021 08:39 AM
    Great!  Thanks again Antony!

    ------------------------------
    Carlo Castillo
    ------------------------------