VMWARE

Written by Sam McGeown on 25/5/2010
Published under VMware and vSphere
I rebuilt an ESX host in my HA/DRS cluster today, following my build procedure to configure as per VMware best practices and internal guidelines. When the host was fully configured and up-to-date, I added it to the cluster and enabled HA and DRS. Then I went to generate some DRS recommendations to balance the load an ease off my overstretched host, but no recommendations were made. I couldn’t manually migrate any VMs either – it was odd, because both hosts were added into the cluster, and could ping and vmkping each other from the console.
Written by Sam McGeown on 16/2/2010
Published under VMware and vSphere
So you’ve upgraded your ESX 3.x servers to 4.0 and you’ve upgraded your vCenter server, now you want to access the shiny new hot-add feature to upgrade some running server’s memory. Except you can’t, the feature is no-where to be seen. Something to bear in mind though, your OS needs to support hot-add, so you’ll need a Windows Enterprise or Datacenter edition. Here’s how to enable it: Upgrade the VM’s tools, if you haven’t already.
Written by Sam McGeown on 27/1/2010
Published under Microsoft and VMware
Configuring the Virtual Environment and Virtual Machines Note – this configuration will work for ESXi 4 upwards due to the server 2008 MSCS requirement for persistent SCSI-3 reservations. The first step is to create a new vSwitch for the host-only cluster heartbeat network, don’t assign any network adaptors to the switch as it’s going to be local only. Create a new virtual machine with a single hard disk. For the purposes of this test, I’ve assigned 2 vProcessors, 1GB RAM, 30GB drive for the OS, 1 vNIC in the default vSwitch0.
Written by Sam McGeown on 11/11/2009
Published under VMware and vSphere
I’m currently in the process of migrating a 2-host High Availability cluster of ESX 3.5u4 servers to vSphere 4. This is going to come in 3 distinct stages: Stage 1 is to upgrade VirtualCenter Server 2.5 to vCenter 4, which I am going to cover today. Stage 2 is to upgrade each host, and will be covered as I do it. Stage 3 is the upgrade of the Virtual Machines to the latest VMware Tools and then the new VM hardware.
Written by Sam McGeown on 14/10/2009
Published under VMware and vSphere
I’m migrating some hosts off of an older storage LUN, but when I drag the disk to the new Datastore with the SVMotion plug-in the job fails with the following error: The error occurs because the virtual disk cannot be moved without moving the source files, the .vmx, .vswap etc. Simply drag the entire VM, rather than the virtual disk to the new Datastore. If you’re trying to move a 2nd, 3rd or nth disk and you get this error, drag the entire VM as per above over to the new Datastore, once that’s completed, go back in to SVMotion and drag the whole VM across again, only this time before you apply, drag the nth disk back to the new Datastore.
Written by Sam McGeown on 2/10/2009
Published under VMware
A.K.A Why not to use snapshots I ran into a slightly confusing problem today - our SQL servers are all created with 4 disks on 4 separate LUNs (System, Swap, SQL Data and SQL Logs). When viewing the server through Virtual Center I couldn’t see all of the LUNs, just the System LUN. It’s not a major problem as the VM can see the storage, but a little annoying when you have to remember what LUN the disks are on.
Written by Sam McGeown on 30/9/2009
Published under Networking and VMware
Here’s the setup. We have a core switch of 2 Cisco 3750s, connected together for fault tolerance as a single logical switch; we also have several ESX 3.5 hosts with 4 Gigabit Ethernet NICs installed each. The Virtual Machines will all be on VLAN 8 (reserved for internal servers) and the VMKernel will be on VLAN 107 (reserved for VMKernel traffic like VMotion).  I want to create a load balanced, fault tolerant aggregate of these four NICs over the Core Switch.
Written by Sam McGeown on 18/2/2009
Published under VMware
Having just rebooted my laptop, I clicked on the link to open VMWare Infrastructure Web Access in the my browser and was slightly puzzled by the “page cannot be displayed” error. I figured it was probably the VMWare Server Web Access service not starting for some reason, so I opened services.msc and checked it out. The Web Access service was actually running, but the Host Agent service was not, so I tried to start it - it failed.
Written by Sam McGeown on 13/12/2008
Published under Networking and VMware
  Having recently installed an ESXi server, I am getting to grips with the management and administration of it, one of the things that I wanted to be able to do was connect to the remote terminal through SSH. I downloaded my SSH client of choice, PuTTY, and set about connecting, however the server refused the connection. It seems that SSH is not enabled out of the box for ESXi and you need to go through some steps to get there - I found some helpful hints here.
Written by Sam McGeown on 15/7/2008
Published under VMware
We recently needed to upgrade one of our applications, and the new version requires an addition server instead of the application and SQL it requires a back end search, a front end web server and a SQL server. The specifications of the new server which are “required” to qualify for support are pretty high. The problem is that the actual processor usage is very light, and it is very hard to justify buying a whole new server that I know is going to be barely used.