My church has Vsphere Essentials Plus licensing. We have created two ESXi 6.5 hosts. We have a iSCSI NAS storage device.
We were completely successful creating the first ESXi 6.5 host and presenting the iSCSI LUN/Datastore but when we attempted to present and setup the same Datastore on the second ESXi 6.5 host we were unable to do so. Both Physical servers are exactly the same make/model and have the same physical configuration.
What can be wrong?
No propper ACL for that given LUN presented or forget to enable multible Host Access for that LUN. A lot of systems have a protection that only one Host can access a LUN, because common filesystems like NTFS are not clusterfs.
Whats happens if you create a 2nd. LUN and try to mount this on your 2nd. Host.
We didn't use the client. we have been using the webclient into the specific ESXi host. We do see that the vmk0 fails during the creation of the datastore, however. This did not occur during the datastore connection on the first ESXi host. It only occurs on the second.
We do see that the vmk0 fails during the creation of the datastore
Please explain what exactly you are doing!
A datastore can be created only once. Once created, the LUN on which it resides has already been formatted with VMware's VMFS file system, so all that needs to be done is to present that LUN to the second host. It should then detect the datastore automatically.
There you have your issue, please try this steps
Create an NFS Datastore
https://www.wojcieh.net/how-to-add-nfs-export-to-vmware-esxi-6-5/ --> check the "Mount NFS Datastore to additional Hosts" section
Hope this works
As others have said " We do see that the vmk0 fails during the creation of the datastore, however." doesn't make much since. Usually with iscsi if it works the first time and not the other, make sure your lun is setup for multiple access or multiple initiators. For example if your using a nimble storage array, you check the "Allopw multiple initator access" check box
So please explain exactly what steps you are taking in the vSphere Client (in your browser) to try and get this connected.
Screenshots of your vSwitch setup and storage adapter setup from the vSphere Client would help.