VMware vSphere 4 offers multiple options for expanding virtual machine storage with zero downtime, including the ability to grow a running virtual disk. Hyper-V marketing literature makes a similar claim, but is limited to simply adding another virtual disk.
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With VMware vSphere, ESX, and VMFS, running out of space on a datastore does not cause damage to virtual machines. It is easy to recover without even a guest OS reboot.
If you have been using VMware ESX, then you might be a little spoiled by VMFS, VMware’s clustered filesystem. I have a hunch that many of us just take it for granted: create large LUNs, add to multiple ESX servers, create your virtual machines and be done with it. And, oh, migrate the VMs around […]