IS the UUID and device ID is the same?

Dear team,

Ask you to help me with the following queries?

Q1:-UUID and device Id is the same?

Q2:-peripheral Id comes from storage array to a LUN?

Q3:-is the UUID provided by an ESX Server, then this ESX Server to identify this LUN?

Q4 :-UUID is also called or refers signature ESX?

Concerning

Mr. VMware.

Hello

in general, the signature should not change in a scenario you desrcibed.

The ESX host allows you to create a data store VMFS on this LUN collects information provided by the table.

This information will be used to generate a signature (the process itself is still not published by VMware).

The signature itself is stored in the VMFS data store and is always used when the Renumeriser SCSI operations.

Whenever an ESX Server perform a reboot or rescan operation, the following procedure will be used (high level).

The ESX Server will

  • analyze the SCSI bus and collects information for SCSI on any device seen
  • Search for an existing partition table and the types of known partitions
  • for each VMFS data store found it will read the signature
  • checks if the signature matches with SCSI information
    • matches, continue to accumulate the VMFS datastore
    • does not, this VMFS datastore is not mounted automatically because it is identified as an "instant" feature

So you could access easily other ESX servers on this device when each ESX Server does not see the device with the same SCSI information.

As a best practice, each server ESX shoud see such device shared with the same LUN ID.

The modern paintings are capable of presenting storage devices with different LUN ID in an initiator (HBA) basis.

Another thing to keep in mind that ports in frontend used table use the same Port SCSI/flag settings, but these indicators may differ between vendors.

If these two basic requirements are met, you will be able to share the easy storage device between multiple ESX servers.

Kind regards

Ralf

Tags: VMware

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