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Re: Configuring ISCSI multipathing with Equallogic MEM

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Hiya

 

You might want to disable LACP, as it shouldn't be required and will probably do more harm than good. - reference: EqualLogic Configuration Guide section 7.3.2

 

7.3.2 Multi-path I/O

There are generally two types of multi-path access methods for communicating from a host to an external device. For general networking communications, the preferred method of redundant connections is the teaming of multiple NICs into a single, virtual network connection entity. For storage, the preferred method of redundant connection is the use of Multi-Path IO (MPIO). Though some storage solution can and do support either method for iSCSI connectivity, EqualLogic requires the use of MPIO to enable multiple NIC/HBA connections to be utilized for access to an EqualLogic SAN.

 

EqualLogic MPIO Requirements

The following host port requirements must be met to use MPIO with EqualLogic SANs:

• At least two (2) Ethernet ports are required on each host.

• The host operating system must have a supported MPIO driver or service available.

The ports used for MPIO cannot be "teamed" to other ports.

• The ports must be the same speed

• The ports must be assigned IP addresses on the same subnet

 

Regarding your PG for in-guest iSCSI, I assume you will install the HIT kit in the guests? If so then you should get a better spread of load by following the same rules as the hosts (e.g. two in-guest iSCSI port groups bound to different NICs, two virtual iSCSI nics per guest). Best configuration would be to seperate the guest iSCSI onto their own NICs, but at a pinch they can share with the host VMKs.

 

Regarding the partial/no redundancy, I think I read that this was because of having a single Software ISCI adapter... assuming you are using Software ISCSI that is. Not really sure on this or the impact (I have the same though).

 

Other than the above;

  1. make sure that you bind the storage VMK adapters to the iSCSI adapter on each host (Configuration -> Storage Adapter -> (adapter)Properties -> Network Configuration.
  2. Make sure you configure the IOPS/RR settings properly as per EQL recommendations (search EQL Support KB's for "Change IOPs value // Round Robin for MPIO in ESXi v5.x"
  3. Make sure you have Jumbo Frames setup throughout as EQL requires it
  4. Have a read through the rest EqualLogic Configuration Guide

 

Hope this helps

 

Mark


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