VMware has just announced the release of vSphere 6.5 p01 (Patch ESXi-6.5.0-20170304001-standard). While there are a number of different issues addressed in the patch, there is one in particular that I wanted to bring to your attention. Automated UNMAP is a feature that we introduced in vSphere 6.5. This patch contains a fix for some odd behaviour seen with the new Automated UNMAP feature. The issue has only been observed with certain Guest OS, certain filesystems, and a certain block sizes format. KB article 2148987 for the patch describes it as follows: Tools in guest operating system might send unmap…