VMware has published a patch for ESXi 5.5
Product: VMware ESXi 5.5
Release date: April 7, 2015
Links: KB2112672 | Download
The update resolves an issue that might cause data unavailability in VMware Virtual SAN when upgrading from VMware vSphere 5.5 EP06 or 5.5 P04 to vSphere 6.0 GA.
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The latest ESXi 5.5.0 Build number is now: 2638301
Updated: ESXi Release and Build Number History
Updated: VMware Product Latest Version
Updated: ESXi Image Profiles