UschiR
1 Copper

VNX5400 and ESXi 6.0 SW-iSCSI and port binding

Hello

I was checking for best practices how to provide centralized storage on a VNX 5400 (block) (2 iSCSI IO modules with 2 ports each) to ESXi hosts (vsphere.6.0).

While I read in the VMware best practices (https://www.vmware.com/content/dam/digitalmarketing/vmware/en/pdf/whitepaper/iscsi_design_deploy-whi...)  multipathing that port binding is recommended to allow for multipathing, I found in the documents related to the VNX (e.g. https://www.vmware.com/content/dam/digitalmarketing/vmware/en/pdf/whitepaper/iscsi_design_deploy-whi...) that port binding is not recommended but using dynamic discovery only.

Probably, VMware's recommendation is only valid in the case of the target begin reachable via a single IP-address, which is not the case on the VNX..?

Please confirm that I still should configure the 2 uplinks on the ESXi hosts (respecively the portgroups) to be one active, the other one unused and vice versa.

Thanks a lot!

I found this discussion but it does not really reflect/answer my questions above..

Re: VMware - iSCSI - VNX - Port Binding Question - Single Subnet vs. Multiple Subnets

Best regards

Uschi

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kelleg
4 Ruthenium

Re: VNX5400 and ESXi 6.0 SW-iSCSI and port binding

We (EMC) recommend for iSCSI connections you use the following:

iSCSI_ESX.PNG.png

Also, please see the following white paper:

https://support.emc.com/docu53338_VMware_ESX_5.x_iSCSI_NMP_Connectivity_Guide_for_VNX.pdf?language=e...

Additional, you'll need to disable TCP Delayed ACK on all the hosts using iSCSI.

VMware ESX host server, see KB 459336 - Why is ESX performance slow when using iSCSI?

https://support.emc.com/kb/459336

I would also recommend that you change the IO Operation Limits from the default of 1000 to 1

https://kb.vmware.com/kb/2069356

glen

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carlos.alfaro
1 Nickel

Re: VNX5400 and ESXi 6.0 SW-iSCSI and port binding

Hi, I use the next connectivity example for iSCSI to VNX or Unity:

iSCSI_path.PNG.png

Without port binding:

https://kb.vmware.com/kb/2038869

Use the next example without port binding:

VMware Training - iSCSI and VMware vSphere 5 - Method 1 - YouTube

Is good idea use jumbo frames (9000 MTU)