There was a significant increase in the IOPS and the cost. VMware, on paper, guarantees you up to 3 million IOPS on vSAN. The more efficient hard disk drives (HDDs) you have, the better the IOPS speed. Since this works on the local storage cluster, there is very little loss of IOPS compared to the traditional SAN boxes, where you need FC connectivity.
There was a significant reduction in the total cost of ownership. Due to the local storage architecture involved in vSAN, the prices are significantly cheaper if compared to the SAN disks that you have in the SAN boxes. The price difference is anywhere between 20% to 40%, which is a significant amount.
Improvements to My Organization:
Since I am working in the banking and finance industry, speed is of paramount importance to us since we deal with millions of records fetching data everyday. vSAN helped us to leverage this and speed up the response time from our applications to the end users.
Room for Improvement:
The vSAN Hardware Compatibility List Checker needs to improve, since currently it is a sore point for vSAN. You need to thoroughly check and re-check the HCL with multiple vendors like VMware, in the first instance, and manufacturers like Dell, IBM, HPE, etc., as the compatibility list is very narrow. I would definitely be happy if there is significant additional support for more models of servers from Dell, IBM, HPE, etc.
Use of Solution:
I have used this solution for a year and a half.
We did encounter stability issues. Initially, we faced issues due to the lack of visibility of the HCL from VMWare and the hardware vendor (Dell). But once the issue was sorted out, the product gave rock-solid stability.
We did encounter scalability issues. Similarly, when we added a new host in the existing cluster, we faced a similar issue on HCL, but that was resolved soon.
I would give the technical support a 8/10 rating.
We were using traditional SAN technology before moving over to vSAN.
The initial setup was pretty straightforward.
Cost and Licensing Advice:
Make sure that you verify and again verify the HCL, before you place an order for the hardware.
This will definitely reduce your TCO by at least 50%. Hence, if you are planning to go with this product, just go ahead. But again, as I have said previously, please make sure that you take a look at the HCL up to the micro-level.
Disclosure: I am a real user, and this review is based on my own experience and opinions.