VMware vSAN release was just announced, namely vSAN 6.6

There are many new features which were pushed on the latest release ,few of them are listed below:

1: vSAN Encryption

Encryption in vSAN 6.6 takes places at the lowest level, meaning that you can also get the benefits of dedupe and compression. vSAN encryption is enabled at the cluster level, but It is implemented at the physical disk layer, so that each disk has its own key provided by a supported Key Management Server (KMS).For customers running all-flash vSAN however there was one big disadvantage and that is that encryption happens at the highest level meaning that the IO is encrypted when it reaches the write buffer and is moved to the capacity tier.

vCenter instance object –> Configure tab –> More / Key Management Servers.

2: Local Protection in vSAN Stretched Cluster

There are now two protection policies; Primary level of failures to tolerate (PFTT) and Secondary level of failures to tolerate (SFTT). For stretched cluster, PFTT defines cross site protection, implemented as RAID-1. For stretched cluster, SFTT defines local site protection. SFTT can be implemented as RAID-1, RAID-5 and RAID-6. 

3: Unicast Mode :

If you are upgrading from a previous version of vSAN, vSAN will automatically switch to unicast once all hosts have been upgraded to vSAN 6.6. Now there is a catch to it ,if the on-disk format has not been upgraded to the latest version 5, and a pre-vSAN 6.6 host is added to the cluster, then the cluster reverts to multicast.Here is what you see through the client:

Command you can use is : 

esxcli vsan cluster unicastagent list

4: Resync Throttling :

In the past, if a resync process was interrupted, the resync may need to start all over again. Now in vSAN 6.6, resync activity will resume from where it left off (if interrupted) by using a new resync bitmap to track changes.

5: pre-checks for maintenance mode :

It point out on the data present in the disk group.

Warning message : Data on the disk from the disk group xxxxxxxxx will be deleted . Unless the data on the disks is evacuated first,removing the disks might disrupt working VMs.

Three options but it has all the information in details what we need to understand:

  • Evacuate all data to other host — > It will let you know the amount of data that will be moved to other hosts .
  • Ensure data accessibility from other hosts –>No data will be moved
  • No data evacualtion –> No data will be moved form the location.

6: HTML5 Host Client Integration :

This one is the best and was much awaited feature on VSAN.

For more reference please follow :

  • http://www.yellow-bricks.com/2017/04/11/whats-new-vsan-6-6/
  • https://cormachogan.com/2017/04/11/whats-new-vsan-6-6/