Expansion of HP MSA 2050 with VMware ESXi

You will lose the data if you click Yes, if there is any data.

BUT is this a new LUN on the MSA (volume3)?

if this is a new LUN, it's being freshly created. does 7.57TB match the volume 3?

Are you creating a new DATASTORE, or EXPANDING a current datastore ?

Are volume 1 and volume 2 = 1 single datastore ?

with you A and B in the diagram, did you first create volume 1, and create a datastore, add more disks (B), create a volume 2, and then add it to  previous datastore to expand it ?

and now want to expand again, add new disks, created volume 3 and want to expand the datastore.

(normally you would add disks into A..... and have one large virtual disk A on the SAN, and then divide up into LUNs to create datastores)

-->BUT is this a new LUN on the MSA (volume3)?
yes
-->if this is a new LUN, it's being freshly created. does 7.57TB match the volume 3?
Yes
-->Are you creating a new DATASTORE, or EXPANDING a current datastore ?
Expanding the current one.
-->Are volume 1 and volume 2 = 1 single datastore ?
Different Datastore
-->with you A and B in the diagram, did you first create volume 1, and create a datastore, add more disks (B), create a volume 2, and then add it to  previous datastore to expand it ?
Yes. This is what I am trying to do but afraid of data loss.

Okay this question is with reference to this data on this LUN (new LUN) not the old LUN.

(first prompt, which states this device is unclaimed)

Continue, and will expand current datastore.

-->Continue, and will expand current datastore.
Can I click yes and continue on the below prompt ?  Are you sure there is no dataloss?

I am still worried because the new LUN is on expansion module.
Image here

-->I'm not sure why you didn't add those new disks into existing B (LUN) create on current unit.
I am sure of how to add to the same LUN assuming its different enclosure it cannot be added.
Please correct me if I am wrong. Thank you very much for your time.

That is a possibility across an Expansion Module, @AndyAdler would know for sure.

Can you please send me an article how to add new HDDs to the current LUN?

It doesn't differentiate between whether disks are in the base enclosure or an expansion one. Best practice if you have multiple enclosures is to arrange disks in arrays vertically, then under some circumstances you can lose a whole enclosure and still keep running, rarely ends up that way since people expand rather than buy 7 additional enclosures to start with, MSA2050 is limited to 16 disks in an array

Our HSG80 was arranged like that sad it's gone now!

I can see one LUN size is expanded by running command "expand volume size <sizeinGB> volume1"
But it is not effected in ESXi. I cannot see the updated size in ESXi.
  This is what I can see in the pools
 

You may have to Refresh Storage Controllers or Rescan

Or add the current unclaimed space

-->You may have to Refresh Storage Controllers or Rescan
I tried refreshing but it didnt help
not sure about rescan and how to add unclaimed space.

You need to select HBA and issue a rescan

I rescanned all adapters (HBAs)  but no luck. :(
Appreciate your help

Is the volume expansion complete? You won't see the extra space until it is. Don't know if show volumes can confirm that or not. Pretty sure it is in the SMU GUI.

Screenshot of the pools and volumes here
https://www.experts-exchange.com/questions/29146746/Expansion-of-HP-MSA-2050-with-VMware-ESXi.html?anchorAnswerId=42869918#a42869918

when you click Increase datastore, you've got two options, and then the next setting should show any unclaimed space or new luns, to expand into.

I added 4TB out of 8 TB but I cannot add the remaining 4 TB
Now I can see 4TB added to the current datastore but cannot use the balance 4TB

I deleted two volumes and create a single volume with bigger size.
Now it shows unallocated