Help with adding 2.5TB datastore to ESXi 5.5 hosts / datacenter

king daddy
king daddy used Ask the Experts™
I have an EMC VNXe 3150. I also have (3) ESXi 5.5 hosts in a datacenter. I have a few datastores over 2TB. However, I am unable to add a 2.5TB datastore from a LUN of 2.5TB presented to the hosts over iSCSI, just like all of the others. It is GPT, VMFS-5, 1MB. The stand-alone client shows 2TB max file size though. Error simply says an error occurred during host config.

Any help is much appreciated.
Watch Question

Do more with

Expert Office
EXPERT OFFICE® is a registered trademark of EXPERTS EXCHANGE®
Ajay ChananaMCSE-2003/08|RHCSA| VCP5/6 |vExpert2018
Distinguished Expert 2017

you can add 64 tb LUN. 2tb file size is not relevant here.

can you share hostd and vobd log for the time when u get this error to proceed further.

basic check to check vsphere maximum guide if you have exhausted the limitations

how many LUN added so far?
how many path each LUN have ?
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization Consultant
Fellow 2018
Expert of the Year 2017

Okay are we getting confused between VM disk size and datastore size?

What are you trying to increase?


7 LUNS so far from EMC to hosts, 2 paths each
Max LUN size is 6.8 TB used to create a datastore is all 6.8 TB
I will try to retrieve logs soon

I am trying to create a 2.5 TB datastore from a 2.5 TB LUN presented from the EMC to the hosts
I then want to create a new VMDK of 2.5 TB. I go to a host, go to config, go to storage, click add storage, see 3 LUNS one of which is the 2.5 TB LUN I want to use. I choose it then go through the wizard. At the end it shows max file size is 2TB (this is the vSphere client, not web). I then click finish and get an error stating an error occurred during host config. Same error on web client.

Thanks a lot guys.
Sorry I let this slip guys. We ended up reconfiguring the older SAN and got it to work. Thanks


We reconfigured the SAN and were able to add the storage.

Do more with

Expert Office
Submit tech questions to Ask the Experts™ at any time to receive solutions, advice, and new ideas from leading industry professionals.

Start 7-Day Free Trial