Scott Lowe -> RE: VMware vSphere Storage Appliance (29.Feb.2012 6:09:36 AM)
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Mountainman, Excellent point. With VMFS-3, a 1 MB block size, you were limited to a 256 GB volume. With previous versions of vSphere/VMFS, deciding on a block size was a critical choice. With the new unified 1 MB block size, this is no longer even a decision point and, moreover, a 1 MB block size does a lot of conserve disk space. You may wonder how VMware managed to make such an improvement. With vSphere 5, VMware has moved to a GUID Partition Table (GPT)-based disk format as opposed to the older and less efficient Master Boot Record (MBR) format. This change also allows vSphere to use pass-through RDM volumes in excess of 2 TB (but non-pass through RDM still have a 2 TB size limit). Scott
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