On the vsphere web client I have a strange problem with one of my datastores as it's displayed capacity is incorrect. Originaly it had 1TB of disk space. After I increased it's capacity on 1.4TB the next day it reverted back to 1TB.
The particular datastore in question (MSA_VD005) is located on HP MSA Storage. Originally it had 1TB of storage and from the MSA Array I increased it at 1.4TB, and after that I increased its capacity from the vsphere web client. (Standard procedure as i do always)
The very next day I've noticed a Datastore usage on disk alarm in the web client. When I checked the datastore it had 1TB of space, as if I never increased it.
If I rescan all storage adapters on the hosts, it will show a correct value of ~1.4TB again but If i click the Refresh button it will revert to 1TB again.
In order to verify all of this I logged in with SSH on one of the hosts and verified that the datastore size is indeed ~1.4. It is just that the vsphere web-client somehow pulls wrong value and generates warnings based on that value.
After rescan of the storage adapters:
After clicking the refresh button
Datastore size as displayed from the ESXi Shell
After some troubleshooting we eventually found out that the problem has occurred because of inconsistent versions of ESXi Hypervisors at the hosts.
The datastore was shared between three ESXi hosts. While we made ESXi Upgrades on the two of the hosts, the third was still left with an older ESXi version, (for reasons not worth mentioning).
The two hosts were at
VMware-VMvisor-Installer-5.5.0.update02-2068190and the third was still atVMware-VMvisor-Installer-5.1.0-799733and that was causing the problem.After we finally upgraded the third ESXi host at the final version, the problem fixed on itself and never occurred again.