There are two simple checks a virtual infrastructure (VI) admin should be doing to ensure ESXi Datastores and the Windows VM’s are properly aligned. If either are misaligned then performance issues will follow. Though I’m not going to get into the whys and how’s of alignment issues I will show you how to quickly check.
1 – ESXi Datastores (DS)
By default if the VI admin formats the DS with vCenter Server or directly connected to a host via the VI Client the starting sector will be 2048. A starting sector of 2048 will satisfy nearly all of the storage vendors out there, however 2048 starting sector should be validated with your storage vendor.
If the VI Admin chose to format the DS via a script then they should choose a starting sector of 2048 or what the storage vendor recommends
Example — partedUtil setptbl $disk gpt “1 2048…..”…
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