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  • 1.  iscsi traffic is not load balancing

    Posted Aug 16, 2023 03:28 PM

    I have hosts with Dell QLogic FastLinQ QL41xxx Series 10/25 GbE Controller (iSCSI) CNA's in them which are connected to two separate Juniper EX4600 switches.  That then connects into some Netapp storage array's. 

    Reviewing this old guide

    I have a vswitch setup with 2 separate port groups attached to the vswitch and the physical adapters

    vswitch and PG

    I have both adapters tied to the port groups with 1 active and 1 standby.  Each active is not the same in the two port groups.

    PG config

    In the storage adapters I just have 1 vmk attached to 1 vmhba.  This is the only part of the configuration that differs from the guide but I have 2 actually vmhba's which the guide does not cover it only covers using the software adapter.  Is this where my configuration is wrong and causing all traffic to go over 1 NIC at a time?  If this is would adding the other vmk to both vmhba's cause any issues if done in production?  Would this causing any issues since I have separate SAN's ie SAN A and SAN B?  If there are any guides on this kind of setup ie 2 SANs I would appreciate links to those.  All I can find are old single SAN setup documents. 

    storage adapters.PNG


  • 2.  RE: iscsi traffic is not load balancing

    Posted Aug 24, 2023 04:37 PM


    Read this best practice document: Best Practices For Running VMware vSphere On iSCSI | VMware

    You need to bind iSCSI to multiple VMK for multipathing and load-balancing.