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.
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When a datastore in your VMware vSphere environment is about to fill up, you can have vCenter automatically spring into action to prevent downtime by using Storage VMotion.
Unlike Storage VMotion from VMware, Quick Storage Migration requires a VM to suspend and be unavailable for a period of time, making it unsuitable for production.
Yesterday Chad Sakac wrote a nice article on Storage VMotion that you might want to check out. I think the Q&A format makes it easy to read. It is an amazing thing to see an entire running VM move from one storage array to another. Hmm, makes you wonder what the smart guys in VMware […]