May 26, 2015

vSphere Storage Terminologies - Zeroing


Zeroing is the process whereby disk blocks are overwritten with zeroes to ensure that no prior data is leaked into the new VMDK that is allocated with these blocks. Zeoring in the ESXi file system (VMFS) can happen at the time a virtual disk is created (create-time) or on the first write to a VMFS block (run-time).


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