Volume not visible when creating new VMWare VM

Guys, I need some help with something which is just beyond my undwerstanding.
What I'm tryiong to do now worked perfectly just few days ago and AFAIK, I did exactly the same.
I hope it's just some stupid mistake I'm doing.

Here is the problem:

I'm creating a new volume on our Dell Compellent, it's mapped to a VMWare cluster.
Then I go to my VCenter and I'm trying to create a new VM. Unfortunatelly, I'm
unable to select that new volume to create new vhdd. The volume is not there !

I spent 3 hours staring at the screen and if I had any hair, I would start pulling it.

PLEASE HELP !
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tp-it-teamAsked:
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bullfrog264Commented:
How are you connecting the Dell Compellent storage to the VMware cluster?  Is it over NFS or a direct attached iSCSI\FC LUN?
tp-it-teamAuthor Commented:
iSCSI and it's working fine as I already have 1 VM working. I also created few test VMs few days ago and it all worked fine. Today, I deleted these test VMs and the volumes they were residing on.
So it should be all fine.
For some reason I'm unable to do it anymore.
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Can you confirm if the LUN is available, and presented to the ESXi host, you'll find this under storage adaptors ?
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tp-it-teamAuthor Commented:
Andrew, can you tell me where exactly should I check to confirm it ? I dont see any tab / option called 'storage adaptors'.
I'm still a complete novice when it comes to VMWare / Compellent so things obvious for you maybe not so obvious for me :)
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Select the Host (using vSphere Client),

Configuration Tab > Storage Adapters

select the Storage Adaptor you are using hardware or iSCSI Software Adapter

how many connected targets, devices, paths are displayed....

these are your iSCSI LUNs, each LUN is formatted with a VMFS datastore (or volume as you refer to them!).
tp-it-teamAuthor Commented:
there are 4 targets, 5 devices and 10 paths
I have 5 datastores mapped to my VMWare Cluster.
When I create a new VM, in the storage part, I can only see 4 of them.
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
is this the same on all hosts ?

or a single host is missing 1 datastore?
tp-it-teamAuthor Commented:
Well, currently I only have 1 running VM and when I'm trying to add a new V HDD to that machine, that new datastore is also not visible.
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
this datastore was created on a different host?

if you re-scan the storage adaptor for new devices and VMFS datastores does it appear ?
tp-it-teamAuthor Commented:
OK, I found it !
This shows what a n00b I am :)
I forgot about one step.
After creating a new volume in my compellent admin panel, I need to go to vSphere Client
Home > Inventory > Datastores and Datastore Clusters and choose 'Add a datastore' !
Problem solved.
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Yes, you need to create a datastore on a LUN, that you present to ESXi.

You can also go to Configuration > Storage > Add Storage (which is adding new storage!)

vSphere Storage Guide is here

https://pubs.vmware.com/vsphere-55/topic/com.vmware.ICbase/PDF/vsphere-esxi-vcenter-server-55-storage-guide.pdf

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tp-it-teamAuthor Commented:
Thanks very much.
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