When adding iSCSI LUNs to ESXi 6.0 we can encounter a bug
Today we need to add a new iSCSI logical unit number (LUN) to one of our vCenter 6.0 and found a bug in ESXi 6.0.
After creating the LUN in NetApp it is presented to the hosts. Adding the iSCSI to one of the hosts everything was okay, but when the rest of the hosts recognized the new Datastore we found some warnings in all hosts.
"Deprecated VMFS volume(s) found on the host. Please consider upgrading volume(s) to the latest version"
Troubleshooting the host log in /var/log/hostd.log we found something similar to this:
warning hostd2EFC2B70] [Originator@6876 sub=Hostsvc.DatastoreSystem opID=7878B682-0000041D-2b-bb-41-25e0 user=vpxuser] VMFS volume /vmfs/volumes/56d6cfc8-c7b45bfc-0cd5-984be167ca4c] of version 0] is not supported. warning hostd2EFC2B70] [Originator@6876 sub=Hostsvc.DatastoreSystem opID=7878B682-0000041D-2b-bb-41-25e0 user=vpxuser] UpdateConfigIssues: Deprecated VMFS filesystems detected. These volumes should be upgraded to the latest version
It seems that ESXi 6.0 has a bug when adding the iSCSI LUN to the host and while it is mounting (when unmounted) it gets this warning. Because the version of the filesystem is not known during the initial detection, it cannot be matched in the initial state (while mounting the LUN).
There is no solution from VMware for this issue; the knowledgebase article about this bug is here: VMware KB 2109735
Since there is no fix at the moment for the issue, the solution is to restart the management agents on the hosts that have this issue. This will clear the warming message.
To restart the management agents we can go through the Direct Console User Interface (DCUI) and just choose the Restart Management Agents option.
Note: This option can disconnect your ESXi host temporarily from vCenter.
Or we can just log in using SSH in the ESXi host(my prefer option) and restart from the console. Just use this:
Do this on all hosts affected (that have the warning message) and they will be cleared.
Hope this can help you fixing this bug.
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