Bugs on Virtual to Virtual Migration from Microsoft to VMware

Posted on October 9th, 2010 in Tips, vSphere | No Comments »

Recently had found some weird issue while we tried to migrate virtual to virtual from Microsoft Virtual Server 2005 to VMware vSphere 4. The import process done successful by the VMware converter, but we realized the network packets get delay while we performed the continues ping test to the virtual machine. the Ping respond had been delayed more than 1000ms in the LAN environment.
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mgmt-vmware service malfunction

Posted on July 8th, 2009 in Tips, vCenter, vSphere | No Comments »

Most of us may had previously experienced a VM which hung in the ESX hosts. Usually we will use the command vmware-cmd utilities to kill or stop the virtual machine. Sometimes we even need to use the vm-support command to force the VM to be stop hardly if vmware-cmd was not worked. Today I found some interesting issue with 1 of the virtual machine. I had executed the instruction to power off from vCenter 4. This virtual machine is running on vsphere 4. After 2 minutes, the virtual machine still showed power on from the vCenter, and I executed again the 2nd command to power off, the system prompted that another process was in progress, and access was denied.

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Virtualization on Blade

Posted on June 29th, 2009 in Data Center, Hardware, Tips, Virtualization | No Comments »

We see the growth in the market to be more aggressive for consolidation in the data center for both physical and virtual server from time to time. There are plenty of solutions in place allow blade to support virtualization today such as virtual connect from HP, pass through module, infiniband integration Xsigo, Cisco UCS and etc. This had significant resolved the I/O interfaces require per blade to host the virtualization host server. CPU and memory per blade and significant increase with the latest release from all the major server vendors, the CPU, memory and disk I/O are no longer the concerns for virutalization.

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Tips to recover Snapshot problem on VM

Posted on June 29th, 2009 in Tips, Virtualization | 1 Comment »

You may had experienced the snapshot problem when the snapshot delta virtual disk had become huge which is more than 20GB and is not able to be truncated by removing all the snapshot. Usually the problem occur when the snapshot is no longer available from snapshot manager, but you can see the delta files available from the command prompt or physical folder that contain the Virtual machine images. I experienced the 2nd time now which I am not able to remove the snapshot on a particular virtual machine from snapshot manager and command prompt. The production virtual machine was powered off due to disk full on the specify datastore. This virtual machine contain a previous snapshot which taken 2 weeks before and yet to be truncated. The delta disk had grown up to >20 GB and fully fill up the available space within the data store.

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Improve Utilization on ESX Hosts

Posted on May 17th, 2009 in Data Center, Tips, Virtualization | 2 Comments »

As virtualization does help us to consolidate virtual machines into physical servers, we are always looking into a better consolidation ratio and hardware utilization. We may not want to achieve this by hitting to performance issue on the virtual infrastructure. Here is 1 of the way you may consider to improve the utilization on your ESX host.

As my environment, the virtual infrastructure are supporting our global business in Asia Pacific, EMEA and NA time zone. When I tracked back the performance history and found the busy hour for most of the machines will be different. Due to the time zone different, I notice that the hardware utilization on the ESX host are always remain 40 to 50 % all the time.

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