What’s New in VMware vSAN 6.7


VMware vSAN 6.7 is here!  These days VMware unveils vSphere version 6.7, including seventh generation of vSAN, version 6.7, which is focused completely on helping our customers take their IT and HCI experiences to the next level – from the
operations to operations to support vSAN.  Significant improvements to the management and monitoring tools are also matched by lower level performance and application consistency improvements.

vSAN continues to see rapid adoption with more than 10,000 customers and growing. Today we’ll have a look at the new features included with vSAN 6.7 …

The new “Clarity” HTML5 UI framework removes the dependency on Flash and provides a clean modern look for managing virtualized infrastructure. This new vSphere Client provides a consistent user experience across modern web browsers on most popular operating systems, backed by updated workflows that simplify common operations. The HTML5 UI is a great step forward in providing vSAN users an intuitive and efficient user experience.


vSAN 6.7 introduce support for 4Kn drives, offering better compatibility for today and more device options for tomorrow. 4Kn is the format in which the physical sector size is 4,096 bytes, and the logical sector size is also 4,096 as well. vSAN’s data plane I/O is optimized for 4Kn. Disk Groups in vSAN 6.7 can be comprised of 512n, 512e, and 4Kn disks. Virtual disks will continue to utilize a 512-byte disk format and can still be easily moved to or from supported vSphere datastores that do not use 4Kn devices. Non-vSphere datastores will be required to use VMFS 6 to support 4Kn devices. VMware vSAN 4Kn drives are supported for vSAN capacity only.

– A new feature known as “vRealize Operations within vCenter” provides an easy way for customers to see vRealize intelligence directly in the vSphere Client. From there, vROps analytics are visible in the new HTML 5 based vSphere Client using built in dashboards for vCenter and vSAN. For situations requiring more detailed information, the full collection of dashboards in vR Ops can be launched from the vSphere Client with two simple clicks. This functionality makes it easy for administrators to see key metrics at a glance and troubleshoot more quickly when an issue occurs.

vSAN 6.7 now expands the flexibility of the vSAN iSCSI service to support Windows Server Failover Clusters (WSFC).  vSAN already supports modern Windows application layer clustering technologies such as Microsoft SQL Always-on Availability Groups (AAG), Microsoft Exchange Database Availability Groups (DAG), and Oracle Real Application Clusters (RAC).  vSAN 6.7 supports shared target storage locations when storage targets are exposed using the vSAN iSCSI service.  This enhancement allows data center administrators to run workloads using legacy clustering technologies on vSAN as they transition to more modern implementations of application layer clustering.

vSAN 6.7 introduces an Adaptive Resynchronization feature to ensure fair-share resources are available for virtual machine I/O and resynchronization I/O as the I/O changes. When I/O activity exceeds the sustainable Disk Group bandwidth, Adaptive Resync guarantees bandwidth levels for VM I/O and resynchronization I/O. During times without contention, VM I/O or resynchronization I/O are allowed to use additional bandwidth. If there are no resynchronization operations being performed VM I/O can consume 100% of the available Disk Group bandwidth. During times of contention, resynchronization I/O will be guaranteed 20% of the total bandwidth the Disk Group is capable of. This allows for a more optimal use of resources.

vSAN 6.7 continues to grow smarter about your infrastructure and provides even more health checks.  These health checks are found throughout the product. They ensure an environment is properly configured using HCL approved hardware.  vSAN 6.7 feeds additional health-related information gathered with vSAN Support Insight and provides the results directly to administrators in the vSphere Client. New health checks include:

  • Maintenance mode verification ensures proper decommission state
  • Consistent configuration verification for advanced settings
  • Improved vSAN and vMotion network connectivity checks
  • Improved vSAN Health service installation check
  • Improved physical disk health check combines multiple checks (software, physical, metadata) into a single notification
  • Firmware check is independent from driver check


vSAN 6.7 optimizes the de-staging mechanism, resulting in data that “drains” more quickly from the write buffer to the capacity tier.  The ability to de-stage this data quickly allows the cache tier to accept new I/O, which reduces or eliminates periods of congestion.  This optimization provides a positive impact for not only VM I/O, but all resynchronization traffic as well.

Cool, isn’t? For more technical information, have a look on Storage Hub.

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