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Vmware VM host and storage migration

One of my site currently have 4 ESX host (all blade servers) and 1 DS4700 storage.

The 2 ESX host server (HS21) are installed with ESX3.5 and the other 2 (HS22) is installed with ESX4.1

All the servers are managed by a vcenter. and the LUN are mapped to a group in the DS manager.

Recently purchased HS23 is to replace the HS21 servers. The new server is installed with ESXi5.0 U3. I've created a new group in the DS storage and map a new lun.

I'm going to install a new vcenter to manage the new server. But my final result need to be the HS22 and HS23 to be managed by the new vcenter.

Is it better if I add the new host and new lun to the existing host group or add the existing lun and host to the new host group in the IBM DS storage?
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8/22/2022 - Mon
Andrew Hancock (VMware vExpert PRO / EE Fellow/British Beekeeper)

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You mean remove HS21 server from the ds storage host group?
Andrew Hancock (VMware vExpert PRO / EE Fellow/British Beekeeper)

Yes, sorry, when all is done, and migrated and ready, remove H21 from the ds storage host group.

The new lun stores some VM and its vmfs5. So If i move the new lun and the host to the existing host group, only the new host able to access the new lun and other old lun?

Those old ESX host only able to see the old lun?
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Andrew Hancock (VMware vExpert PRO / EE Fellow/British Beekeeper)

Correct, 3.5 can only view VMFS-3, but you could create VMFS-3, and then upgrade to VMFS-5 later.

I've move the host and the new lun to the existing DS storage host group.

The new host able to view all the datastore and the old host able to view those datastore with VMFS-3.