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# vSAN 7.0U2 Performance-Whats New?
- URL: https://admin.hareeshkg.bid/vsan-70u2-performance-whats-new/
- Published: 2021-06-07T18:42:36.000Z
- Updated: 2026-09-12T14:41:00.000Z
- Author: Hareesh K G
- Tags: vSAN Performance, VxRAIL

In this blog I will go over some of the key benefits with vSAN 7.0U2\. I got my hands on a 4 node VxRail Cluster, where I was able to run a few HCIBench tests to compare performance difference between vSAN 7.0 U1 and vSAN 7.0U2\. I won’t be able to write a performance comparison between 6.7.x / 7.0x and vSAN 7.0 U1 as there is a white paper published by Dell-EMC for vSAN 7.0U1 see [VxRAIL-7.0.100-Performance-White-Paper](https://www.delltechnologies.com/asset/en-us/products/converged-infrastructure/industry-market/h18552-performance-vxrail-wp.pdf?ref=admin.hareeshkg.bid).

Summarizing vSAN 7.0U1 overall provides 25% to 30% improvement on RANDOM/Sequential-reads, \~21% improvement for Sequential/Random Writes with RAID-5 storage policy which comes very close to performance numbers with RAID-1 and provides additional space savings of 25% on the vSAN datastore.

## Should you upgrade to VxRail 7.0.200(7.0U2) for performance?

I got my hands on a 4Node VxRail Cluster where I was able to specifically run tests where we expect to see some improvement around RAID-5/Raid-6 for large sequential writes and CPU utilization tweaks which was announced with vSAN 7U2 see : [https://blogs.vmware.com/virtualblocks/2021/03/09/vsan-7-update-2/](https://blogs.vmware.com/virtualblocks/2021/03/09/vsan-7-update-2/?ref=admin.hareeshkg.bid).

## Cluster-Config

Four node VxRail (4 Hosts- Dell Inc. VxRail E560F -2x Intel(R) Xeon(R) Gold 5215 CPU @ 2.50GHz with memory of 256GB each) ,Controller : Avago (LSI Logic) Dell HBA330 Mini, 1DG on each host with drive Model : KPM5XMUG400G (373 GB) for Cache-Tier and 4 x KPM5XRUG1T92 (1788 GB) Capacity Tier, Deduplication and Compression enabled.

## Performance Test

Easy-run test for 256K Block size , 1 thread, sequential writes with 100% working-set,8VMs and 8VMDKs each. I ran the same tests repeatedly before on 7.0U1 by de-staging / clearing write buffer on all the hosts just to get a consistent baseline performance on VxRail 7.0.100/vSAN 7 U1\. See HCIbench test result below :

# \`Datastore = VxRail-Virtual-SAN-Datastore-1fa9ca3a-6672-4ffe-8150-e0e0c26eb537

JOB\_NAME = job0 VMs = 8 IOPS = 3469.93 IO/S THROUGHPUT = 867.00 MB/s R\_LATENCY = 0.00 ms W\_LATENCY = 18.44 ms 95%tile\_R\_LAT = 0.00 ms 95%tile\_W\_LAT = 25.00 ms =============================\`

I later upgraded to VxRail 7.0.200/vSAN 7.0U2 ran the same workload once again, repeated the same tests multiple times similarly to get a consistent performance baseline, to my surprise I was able to achieve close to 50% boost in overall throughput/ IOPS and significantly lower latency. See HCIbench test result below :

# \`Datastore = VxRail-Virtual-SAN-Datastore-1fa9ca3a-6672-4ffe-8150-e0e0c26eb537

JOB\_NAME = job0 VMs = 8 IOPS = 5833.15 IO/S THROUGHPUT = 1458.00 MB/s R\_LATENCY = 0.00 ms W\_LATENCY = 10.97 ms 95%tile\_R\_LAT = 0.00 ms 95%tile\_W\_LAT = 18.00 ms =============================\`

## Perf-Chart Comparison Before and After Upgrade to VxRail 7.0.200

![](https://admin.hareeshkg.bid/content/images/2026/09/vsan-70u2-performance-whats-new-perf-metrics-correlation.png)

I/o Flow Correlation

![](https://admin.hareeshkg.bid/content/images/2026/09/vsan-70u2-performance-whats-new-beforebpgrade7U1-dom-Client.png)

BeforeUpgrade-Dom-Client

![](https://admin.hareeshkg.bid/content/images/2026/09/vsan-70u2-performance-whats-new-BeforeUpgrade7U1-dom-Owner.png)

BeforeUpgrade-Dom-Owner

![](https://admin.hareeshkg.bid/content/images/2026/09/vsan-70u2-performance-whats-new-BeforeUpgrade7U1-dom-CompMgr.png)

BeforeUpgrade-Dom-CompMgr

![](https://admin.hareeshkg.bid/content/images/2026/09/vsan-70u2-performance-whats-new-afterupgrade-70U2-DomClient.png)

AfterUpgrade-Dom-Client

![](https://admin.hareeshkg.bid/content/images/2026/09/vsan-70u2-performance-whats-new-AfterUpgrade-70U2-DomOwner.png)

AfterUpgrade-Dom-Owner

![](https://admin.hareeshkg.bid/content/images/2026/09/vsan-70u2-performance-whats-new-AfterUpgrade-70U2-CompMgr.png)

AfterUpgrade-Dom-CompMgr

To view these advanced performance charts on the VC-Ui, you may choose to navigate to “performance for support view” , I actually generated these above charts using open-source grafana tool, however same data can be viewed within VC-UI.

![](https://admin.hareeshkg.bid/content/images/2026/09/vsan-70u2-performance-whats-new-perf-For-Support-1024x609.png)

## Conclusion

Although vSAN 7.0U1 provides better performance than the previous releases, I would highly encourage you to upgrade to vSAN 7.0U2/VxRail 7.0.200 or higher. With VxRail 7.0.200/vSAN7U2 you will :

> Improve the performance on RAID-5/6 workloads especially large Sequential Writes/reads by **\~50%** Reduces the CPU/network utilization thereby schedule and process more IOPS, push more IOPS over network. Get additional space savings when you compare space requirement between RAID-1 and RAID5/6 as this is more viable for certain workloads for the given perf-improvements. Significant performance improvements seen on AMD-EPYC CPU platforms with better NUMA awareness.