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  • 1.  Slow Network with SEA on DUALVIOS 4.1.0.10 on IBM i 7.5

    Posted 27 days ago

    Hi,

    we have an Power 10 System configured with DUAL-VIOS. The Client LPAR ist an IBM i with 7.5 and all latest PTF installed.

    FTP Connection is running fast. But 5250, Navigator for i and outgoing SSH Connection is very slowly.

    The ETHLINE are attached to Shared Ethernet Adapter which are configured als Load-Sharing and failover. Could this be the Problem ?



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    Riccardo Singh
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  • 2.  RE: Slow Network with SEA on DUALVIOS 4.1.0.10 on IBM i 7.5

    Posted 26 days ago
    Edited by Satid S 26 days ago

    Dear Riccardo

    What is the CPU power and memory size you allocate for both VIOS?   What Power server model you are using? 

    Are you sure you implemented SEA failover and not the better vNIC failover?   You should implement VIOS vNIC failover instead:  https://community.ibm.com/community/user/power/blogs/charles-graham1/2020/06/19/vnic-failover-in-powervm-225   and   https://community.ibm.com/HigherLogic/System/DownloadDocumentFile.ashx?DocumentFileKey=87f897df-6a7e-fcf1-5743-abef1b382d4d&forceDialog=0     

    To check any sign of problem on IBM i side, please display your IBM i ETHLINE description to see its current reported status for the speed and duplex to make sure they show proper values (say, in full GB of the physical LAN interface and full duplex). Also run WRKPRB to check if you see any error involving your Ethernet line resource name or not?

    Next, please check the screens of WRKSYSSTS and WRKSYSACT.   In WRKSYSSTS, you should see proper allocation of memory pools as well as proper value of MAX ACT for each.  In WRKSYSACT, you should see proper assignment of virtual processor in relation to allocated processor and you want to see at least 100% value (when there is workload running) of CPU Rate.   You can post the screens here for me to see if you want.



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    Satid S
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    Original Message


  • 3.  RE: Slow Network with SEA on DUALVIOS 4.1.0.10 on IBM i 7.5

    Posted 26 days ago

    Hi,

    both VIOS have 1 CPU and 4 GB RAM

    We are using an IBM Power 19 9105-41B Server

    I used this manual to create the SEA' https://theibmi.org/2016/03/26/how-to-create-sea-with-no-touch-vio/

    So iam sure that there is an SEA configured.

    ETHLINE Description on IBM 

    Leitungsbeschreibung . . . . . . . :   ETHLINE            
    Auswahl  . . . . . . . . . . . . . :   *BASIC             
    Leitungskategorie  . . . . . . . . :   *ELAN              
                                                              
    Ressourcen name  . . . . . . . . . :   CMN08              
    Brücken-ID . . . . . . . . . . . . :   *NONE              
    Bei IPL anhängen . . . . . . . . . :   *NO                
    Wartezeit bei Anhängen . . . . . . :   *NOWAIT            
    Netzwerksteuereinheit  . . . . . . :   ETHLINET00         
    Lokale Adapteradresse  . . . . . . :   020000000001       
    Austausch-ID . . . . . . . . . . . :   05648950           
    Ethernet-Standard  . . . . . . . . :   *ALL               
    Übertragungsgeschwindigkeit  . . . :   *AUTO              
    Aktuelle Übertragungsgeschw. . . . :   *AUTO              
    Duplex . . . . . . . . . . . . . . :   *AUTO              
    Aktueller Duplexwert . . . . . . . :   *AUTO              
    Serviceoptionen  . . . . . . . . . :   *NONE              

     Leitungsbeschreibung . . . . . . . :   ETHLINE                         
     Auswahl  . . . . . . . . . . . . . :   *BASIC                          
     Leitungskategorie  . . . . . . . . :   *ELAN                           
                                                                            
     Maximale Rahmengröße . . . . . . . :   1496                            
     Max. Anzahl Steuereinheiten  . . . :   40                              
     Fehlerschwelle . . . . . . . . . . :   *OFF                            
     Testrahmen generieren  . . . . . . :   *YES                            
     Nachricht- warteschl.  . . . . . . :   *SYSVAL                         
     Akt. Nachrichtenwarteschlange  . . :   QSYSOPR                         
       Bibliothek . . . . . . . . . . . :     QSYS                          
     Text . . . . . . . . . . . . . . . :   Schnittstelle während Testphase 

    WRKSYSSTS



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    Riccardo Singh
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    Original Message


  • 4.  RE: Slow Network with SEA on DUALVIOS 4.1.0.10 on IBM i 7.5

    Posted 25 days ago

    Is "Lokale Adapteradresse  . . . . . . :   020000000001" the LAA of the card ?  If so, are you certain that there is no other system/LPAR/VM with the same LAA ?



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    José Pina Coelho
    IT Specialist at Kyndryl
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    Original Message


  • 5.  RE: Slow Network with SEA on DUALVIOS 4.1.0.10 on IBM i 7.5

    Posted 26 days ago

    When I hear SEA and slow networking on an IBM i client, my first thought is to check Large Send Offload.  Make sure your SEA and it's child adapters are configured to allow large send offload:

    https://www.ibm.com/support/pages/how-determine-if-large-send-offload-lsolargesend-and-large-receive-offload-lrolargereceive-are-enabled-sea



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    Vincent Greene
    IT Consultant
    Technology Expert labs
    IBM
    Vincent.Greene@ibm.com


    The postings on this site are my own and don't necessarily represent IBM's positions, strategies or opinions.
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    Original Message