Help with a post-mortem

Hoping to find an overview here.

I'm new with a small company and an implementation of ESX 2 small vsphere 4.1. I have a background with a significantly bigger vSphere environment.  Yesterday, I made a change to the network configuration from one of the ESX servers that finally overthrew the virtual environment for a period.  I do not understand why it happened, but I would like to offer the facts and see if someone can see what I missed (in addition to first place the ESX Server in maintenance mode).

The network configuration:

vSwitch0 is associated with pnic0 and 1.

Contains groups of ports for network virtual computer and Console of Service.

No VLAN, is on the 10.1.0.0/24 network.

vSwitch1 is associated with pnic2 and 3.

Contains groups of ports for ISCSI1 and ISCSI2.

No VLAN, is on the 10.1.3.0/16 network.

vSwitch2 is associated with pnic4.

Contains a group of ports for vMotion.

No VLAN, is on the network 10.1.3.0/24.

SAN is an array of iSCSI Dell Equalogic.  The software initiator is used.

Changes I made:

First of all, I noticed on the links of iSCSI subnet mask and changed to 24 believing he was wrong.

Then, I wanted to add a service on the network of 10.1.3.0/24 console to ensure a certain level of redundancy.  No particular reason, I chose to add a service on vSwitch2 console.  As soon as I did, on the ESX Server guests seem to lose connectivity to the San.  In other words, they seem to be running, would respond to pings, but were inadmissible for something more.  I also lost connectivity to vCenter (which was allowed) and could not use the VI Client to connect directly to the affected ESX host.

To recover, I had to turn off the ESX host to initiate an HA event to bring guests.  To restart, I was able to delete the new console ESX service console, and then put the ESX Server online.

After the restoration of connectivity, I attempted a subset of customers back to balance the load of vMotion, but discovered vMotion would timeout.  I don't know if vMotion has already worked in this environment or not.  After investigation, I discovered the pnic4 cable (used for vMotion and my extra service console) was just a crossover cable from one ESX Server to another.  I replaced the crossover with some cables through the SAN switch.  vMotion has always failed.  I changed the IP addresses of vMotion network 10.1.4.0/24, vMotion started working successfully.  I figured then that is the reason for the 16 mask which was originally on the iSCSI ports.

I think it's all that relevant.  Again, I'd be recognizing any idea and will certainly provide further information as requested.

Hi Matt,

Welcome to the forums.

You must use different subnets for separate networks. Otherwise if for example your ESX must contact with the IP 10.1.3.64 iSCSI storage, how would it decide vmkernel port to use: one on vSwitch1 or vSwitch2?

When you have changed your ESX configuration perhaps at some point the host has chosen to use the wrong way and lost its connection to the storage.

It will be useful.

Concerning

Franck

Tags: VMware

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