How to reduce LUNa size on Huawei OceanStor 5300 V3 storage system?

Question

System administration

Good day gentlemen!
I have a Huawei OceanStor 5300 V3 storage system (version V300R001C20) and an IBM SW3700 storage system.
They installed them before me and created LUNs in full, which was on pieces of iron.
The problem appeared when I wanted to expand the storage in ESXI. As you know, in vSphere ESXI, the maximum available storage, which allows VMFS5, is 64TB, and the LUN on Huawei OceanStor storage was created at 90TB (the maximum that was available), and it turns out that I cannot use the remaining 26TB due to the fact that Huawei does not have the ability to reduce the LUN, although there is such an opportunity on the IBM SW3700 storage system.
Perhaps there is such a function in more recent Huawei firmware, or is it possible to somehow get around this situation?
Share your experience, who reduced LUNs on Huawei OceanStor storage systems.
Thank you!

Answer 1

And what for in general such huge volumes to create?
It's very easy to get around the situation - migrate all the virtual machines somewhere, delete the 90th volume and create a smaller one, and then scatter the machines over them back.