Connecting ESXi to two different iSCSI SANS

[tkutil]

I have my vSphere 6 connected to a Equallogic iSCSI SAN and would also like to connect to a new Nimble array. I added the new array to the discovery list as well as the appropriate CHAP information and can connect to the Nimble, but when I try to add storage I get this error.

Cannot change host configuration

Call "HostDatastoreSystem.CreateVmfsDatastore" for object "datastoreSystem-29" on vCenter Server "WCGVC.wcg.waukeshacounty.gov" failed.

Any ideas?

[bspagna89]

Hi,

Are you using jumbo frames by chance? if you are, can you ensure its enabled throughout  (vSwitch, iscsi VMkernels, physical switch, SAN, etc). If you are not using Jumbo frames, please ensure everything is set to 1500 MTU.

This error can also happen if what you are trying to present to ESXi isn't wiped already.Try creating a brand new LUN and presenting that to ESXi.

[continuum]

ESXi often has problems with creating a partition table on brand new created iSCSI-volumes.
It often helps to use a Linux to create a partitiontable first.
When ESXi sees a partitioned volume it probably also is able to repartition it.

[eroztech]

Hi,

Reboot the Array and ESXi...I was having the same problem but resolved by rebooting