iSCSI Bug – Traffic Routed Out Wrong Interface – Update

One of my most popular posts to date has been 'vSphere 5 Networking Bug Affects Software iSCSI' with some 20,000 page views and a bunch of comments.  The problem is a bug that causes vmkernel traffic (including iSCSI) to be sent out the unused/inactive/null NIC on a vSwitch with a manual failover order and Active and Unused vmnics.  It still appears that the issue I covered is affecting customers - we just had a new Clearpath customer call for help with this very issue.  VMware's KB on the issue … [Read more...]

vSphere 5 Networking Bug #2 Affects Management Network Connectivity

On Wednesday, I wrote about a VMware vSphere 5 networking bug that caused issues with iSCSI networking.  That bug, described in VMware KB 2008144 caused vmk traffic to be sent over the unused vmnic uplink in a team where there is an unused uplink and an explicit failover policy present.  See the diagram below to better understand what was going on there…. The second bug vSphere 5 networking bug I experienced was similar to the first: traffic was sent out of an unexpected interface after upgrading to ESXi 5.  This particular bug surfaced while troubleshooting my iSCSI bug (because why … [Read more...]

vCenter Crashes After Applying ESXi Patch ESXi410-201010401-SG

My last post described a problem I experienced with VMware HA after upgrading to vSphere 4.1.  Here is my experience with a similar issue after applying the ESXi410-201010401-SG patch to one of my test/dev ESXi clusters.  The patch, released on November 15th and weighing in at a hefty 212MB, fixes a number of issues from Likewise authentication on ESXi hosts to allowing configurable NOOP timout and interval values for faster failover of certain iSCSI arrays (like the DS3300 or MD3000i). The environment where this problem occured has a single vCenter server managing both a production cluster … [Read more...]