Performance Enhancements for vSAN 6.0-6.2 with ESXi 6.0U3

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Wanted to give you a heads up on a recent release for ESXi 6.0U3 which includes some nice performance enhancements for vSAN 6.0-6.2 users.

vSAN Performance: Multiple fixes are introduced in this VMware ESXi 6.0 Update 3 release to optimize I/O path for improved vSAN performance in All Flash and Hybrid configurations:

  • Log management and storage improvements were made that enable more logs to be stored per byte of storage. This should significantly improve performance for write-intensive workloads. Because vSAN is a log based file system, efficient management of log entries is key to preventing unwarranted buildup of logs.
  • In addition to increasing the packing density of the log entries, for scenarios involving large file being deleted while data services is turned on, vSAN preemptively de-stages data to the capacity tier which efficiently manages the log growth.
  • The checksum code path is now more efficient.

Cormac Hogan (VMware Staff) Blog Post
http://cormachogan.com/2017/03/02/vsphere-6-0-update-3-important-update-vsan/

vSAN Performance Enhancements KB Article for ESXi 6.0U3
https://kb.vmware.com/kb/2149127

Release Notes
http://pubs.vmware.com/Release_Notes/en/vsphere/60/vsphere-esxi-60u3-release-notes.html

Thanks, Matthew Kim
Sr. Systems Engineer – Hyper-Converged Software | National Partners

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