alexintel
1 Copper

Failover on iSCSI ports on VNX 5400.

Hi,

How I can be sure that I have configured correctly my iSCSI ports to support failover network?

I have a VNX5400 with SPA and SPB. Each with Two-port 10-Gb/s SFP+ Optical I/O modules, so 2 modules with a total of 4 ports split between SPA and SPB and connected to a switch. I have assigned virtual IPs for each port.

SPA Module 1 SlotA2 -Port0

SPA Module 1 SlotA2 -Port1

SPB Module 2 SlotB2 -Port0

SPB Module 2 SlotB2 -Port1

How I can be sure that if I lost one port (damaged or I disconnect it) another available port will handle his current work? What setup of configuration I need to do?

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kelleg
4 Ruthenium

Re: Failover on iSCSI ports on VNX 5400.

First I'd recommend that you review KB https://support.emc.com/kb/41172. This is the recommended setup for iSCSI.

Next, you'll need to disable TCP Delayed ACK on the hosts:

On the Windows or VMware ESX host server check whether the DELAYED ACK is disabled. To change the delayed ACK settings for (this may also apply to Linux hosts):

a. VMware ESX host server, see emc191777 - Why is ESX performance slow when using iSCSI?
b. Windows, see emc150702 - Recommended TCP/IP settings for Microsoft iSCSI configurations to fix slow performance

As to failover, that is on the hosts through the failover software. There is a setting called "failover mode" - for almost all operating systems that should be set to 4. ESX has what's called a host agent that should automatically setup the failover mode when first connected.

Check the web site mydocument.emc.com - this takes you to a place that you can create a host connectivity guide that will help with setting up the hosts. Go to the VNX Series, then the Server Tasks.

glen

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