VMware vSAN 8™, Introduces the revolutionary Express Storage Architecture™. This is an optional, alternative storage architecture to the vSAN original storage architecture also found in vSAN 8. When running on qualified hardware in approved vSAN ReadyNodes, the vSAN Express storage architecture will offer supreme levels of performance, scalability, resilience, and data services without compromising performance. The vSAN Express Storage Architecture unlocks the capabilities of modern hardware to allow the workloads of today and tomorrow.
Below are some key differences between OSA and ESA Architecture.
OSA: Original Storage Architecture
1. OSA is a vSAN
Distributed File System (vDFS)
2. Drives like SSDs, HDDs, and hybrid supported
by OSA.
3. 1 Cache drive per Disk group is supported by
OSA.
4. Hardware requirements for OSA is Varies as per
vSAN config.
5. With OSA we can get good performance by leveraging
different RAID policies with stripping options.
6. OSA is using disk groups with caching devices.
It can be configured with various hardware, including spinning disks.
7. OSA can run on vSphere 6.x,7.x and 8.x
versions.
8. Minimum 10Gbps network required for host networking.
9. Minimum storage device required to configure OSA is 2.
ESA: Express Storage Architecture
1. ESA is a Log
Structured File System (vSAN LFS)
2. Drives Certified with NVMe SSDs are supported
by ESA.
3. There are no disk groups, hence no caching drive
needed.
4. ESA supports only vSAN ReadyNodes.
5. Performance is excellent with ESA as compared
to OSA.
6. ESA uses a storage pool instead of disk
groups. This makes it more storage effective.
7. ESA is available from vSphere 8.x version
only.
8. Minimum 25GBps network required for host networking.
9. Minimum storage device required to configure ESA is 4.
For more information about VMware vSAN ESA, refer below article.
https://core.vmware.com/blog/comparing-original-storage-architecture-vsan-8-express-storage-architecture
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