Cannot open the disk and could not open change tracking file
Lately I have seen a number of VMs going down after the backup has finished and snapshots get removed. At some point when cleaning the snapshot, the ESXi host decides something is wrong and then brings down the VM. After this we're unable to power on the VM and receive the error: "Cannot open the disk '/vmfs/volumes/xxxxxxxxxx/xxxxx.vmdk' or one of the snapshot disks it depends on". When you then check the event details of the VM, you'll see two messages: - "Cannot open the disk '/vmfs/volumes/xxxxxxxxxx/xxxxx.vmdk' or one of the snapshot disks it depends on". - "Could not open/create change tracking file". The fix to make the VM power on again is simple, however we still haven't been able to solve the root cause. VMware Support has suggested to bring down the number of LUNs connected to a single host and to upgrade to vSphere 5.5. … [Continue Reading]
VMware Auto Deploy with MSCS won’t work
Our environment is fully built using VMware Auto Deploy 5.1. All the clusters have their own ruleset and we're very content on how easily we update our hosts and deploy new hosts. However, recently we ran into a major issue with Microsoft Cluster Services inside VMs in combination with VMware Auto Deploy. In a scenario with an "old fashioned" MCSC cluster across boxes with Physical RDMs shared between the two cluster nodes (VMs), these RDMs seem to be stopping an Auto Deployed ESXi host from reconnecting to vCenter Server after a reboot. … [Continue Reading]
[Powershell] vCPU to Physical Core for XenApp VM
For our Citrix XenApp environment that runs on ESXi, we tend to keep a 1:1 ratio when it comes to physical cores and vCPUs. In other words, an ESXi host with 12 cores, will only be running 6 XenApp VMs with 2 cores or 3 XenApp VMs with 4 cores or any other combination, just as long as the vCPUs configured on the VM, never exceed the number of physical cores present in the host. What about Hyperthreading? The extra HyperThreads that a physical CPU offers are not used in the core to vCPU ratio because specifically in a Citrix XenApp workload, they don't offer a guaranteed performance boost. HyperThreading will be enabled in the BIOS though because it doesn't hurt the performance. … [Continue Reading]
Win a trip around the world with Veeam
Veeam is about to get its 100,000th customer and is launching an interactive contest for a chance to win a trip around the world and other prizes (Google Glass, iPad and Microsoft Surface). To participate, visitors need to register and predict the location of Veeam’s 100,000th customer on the interactive map. The closer you are to the right spot, the better chance you have to win the trip around the world and other prizes. We currently have a live pre-registration page. The main contest will start next week. Join in on the fun! We hope you and your readers will participate and celebrate this great achievement with us. Guess the location here: http://world.veeam.com/ For more information: http://world.veeam.com/veeam_tc_2014.pdf … [Continue Reading]
Please vote for GabesVirtualWorld
Please vote for GabesVirtualWorld at the vSphere-land top blogger contest. … [Continue Reading]
Build A Better Cloud With StratoGen VMware Hosting
Cannot open the disk and could not open change tracking file
Lately I have seen a number of VMs going down after the backup has finished and snapshots get removed. At some point when cleaning the snapshot, the ESXi host decides something is wrong and then brings down the VM. After this we're unable to power on the VM and receive the error: "Cannot open the … [Read More...]
VMware Auto Deploy with MSCS won’t work
Our environment is fully built using VMware Auto Deploy 5.1. All the clusters have their own ruleset and we're very content on how easily we update our hosts and deploy new hosts. However, recently we ran into a major issue with Microsoft Cluster Services inside VMs in combination with VMware Auto … [Read More...]
[Powershell] vCPU to Physical Core for XenApp VM
For our Citrix XenApp environment that runs on ESXi, we tend to keep a 1:1 ratio when it comes to physical cores and vCPUs. In other words, an ESXi host with 12 cores, will only be running 6 XenApp VMs with 2 cores or 3 XenApp VMs with 4 cores or any other combination, just as long as the vCPUs … [Read More...]
Win a trip around the world with Veeam
Veeam is about to get its 100,000th customer and is launching an interactive contest for a chance to win a trip around the world and other prizes (Google Glass, iPad and Microsoft Surface). To participate, visitors need to register and predict the location of Veeam’s 100,000th customer on the … [Read More...]
Please vote for GabesVirtualWorld
Please vote for GabesVirtualWorld at the vSphere-land top blogger contest. … [Read More...]
VMTurbo releases Operations Manager 4.5
Copied from their news release: BOSTON – January 28, 2014 – VMTurbo, provider of the only Software-Driven Control for virtualized environments, today announced a new version of its flagship product, VMTurbo Operations Manager, enhanced with control modules for storage and fabric to drive … [Read More...]
Time to switch your vCenter attributes to tags
VMware has been clear about it, you should switch to the vSphere Web Client and stop using the good old Windows vSphere Client. Being best kid in the class, I of course tell my customers to start using the vSphere Web Client when possible and I work with it myself most of the time. During an upgrade … [Read More...]
Did you know, no VMotion when HA network partitioned
During my migration from vSphere 4.1 to vSphere 5.5, I ran into an issue I had never experienced before. When your VMware HA network is partitioned, vCenter will not let you perform VMotions. At first I was surprised but after some searching I learned the reasons behind it and it makes complete … [Read More...]
NLVMUG Conference Donderdag 6 maart 2014
Zet een groot rood kruis in je agenda op donderdag 6 maart 2014 – dan is het tijd voor de NLVMUG Conference. … [Read More...]
Changing SATP Claimrules for specific storage configurations
At my current customer I was upgrading their vSphere 4.1 environment to vSphere 5.5. When installing and configuring the first ESXi 5.5 host, I noticed a difference in the Path Selection Policy (PSP) between the ESX 4.1 hosts and the ESXi 5.5 host. Each host is connected to two Hitachi storage … [Read More...]
