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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Make a Clone from a Snapshot

Posted on October 29th, 2008 in Tips, Workstations | No Comments »

Virtual machine snapshots can be a valuable tool to IT administrators or developer. A snapshot is a backup/image of your entire system at the time the snapshot is taken. Snapshot provide system restoration and minimize damage of the virtual machine.

Due to certain requirement, you may need to clone a snapshot taken sometimes ago and you can make as many copies as you need.

VMware Snapshot

This guide show how to making a clone from a snaphot on VMware Workstation 6.5.

Note: The snapshot MUST BE from a virtual machine that is powered off.
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My Personal Experience about Citrix XenServer 5.0

Posted on October 8th, 2008 in Virtualization, Xen | 25 Comments »

Yesterday Craig mentioned about 8 VCPU per VM on Citrix XenServer 5 is really a good stuff from Citrix and I must admit that.

I did a quick test and I would like to share my personal review about Citrix XenServer 5.0:

Personally I think network speed is fast compare to VMware ESX. I have a physical 1Gbps NIC network speed and I can get 2Gbps network speed after install XenTools on Windows 2008 server but require 2 times reboot(SuSE Linux require 1 reboot). Anyway VM guest shutdown and reboot process is faster than VMware ESX.

Citrix XenServer

I was try to install SuSE Linux 10 using 4 ISO CD (both NFS or CIFS), the Citrix XenServer always give me an error “The VM rejected the attempt to detach the device xxxxx refusing to close” when switch ISO CD1 to ISO CD2. You have to extract 4 ISO CD into one single location to make it work or copy ISO to local storage(provider you have enough local disk space).

Citrix XenServer

The enterprise product should not have similar issue and this is not make sense at all.

Citrix XenServer

Anyway, you can try alternative way using “Install URL” instead of using ISO Image once you have extract ISO CD into single folder on your web server.

Install URL: http://xx.xx.xx.xx/inst/10/32/SP2/ALL
Advanced Boot OS Parameters:
console=ttyS0 xencons=ttyS hostip=xx.xx.xx.xx/24 gateway=xx.xx.xx.xx dnsserver=xx.xx.xx.xx

Please make sure your have correct IP, gateway and DNS setup properly else you will getting error during installation.

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Live Clone on Virtual Center 2.5 update 2

Posted on September 4th, 2008 in Virtualization | 1 Comment »

With the latest release from VMware on the virtual center, it does provide the LIVE CLONE features which previously I had also suggested to the local VMware representative. What is Live Clone, Live clone meants you can now clone the VM in online status.

This had been really impressed and simplify the day to day task for our operation perspective. We know the snapshot manager is the option do help when we apply changes to the VM, but some how for critical machine, we do need to have clone another set of VM in case for roll back purpose.

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