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ESX Configuration Guide

5From the list of LUNs, select the LUN that has a datastore name displayed in the VMFS Label column and click Next.

The name present in the VMFS Label column indicates that the LUN is a copy that contains a copy of an existing VMFS datastore.

6Under Mount Options, select Keep Existing Signature.

7In the Ready to Complete page, review the datastore configuration information and click Finish.

What to do next

If you later want to resignature the mounted datastore, you must unmount it first.

Resignaturing VMFS Copies

Use datastore resignaturing to retain the data stored on the VMFS datastore copy. When resignaturing a VMFS copy, ESX assigns a new UUID and a new label to the copy, and mounts the copy as a datastore distinct from the original.

The default format of the new label assigned to the datastore is snap-snapID-oldLabel, where snapID is an integer and oldLabel is the label of the original datastore.

When you perform datastore resignaturing, consider the following points:

nDatastore resignaturing is irreversible.

nThe LUN copy that contains the VMFS datastore that you resignature is no longer treated as a LUN copy.

nA spanned datastore can be resignatured only if all its extents are online.

nThe resignaturing process is crash and fault tolerant. If the process is interrupted, you can resume it later.

nYou can mount the new VMFS datastore without a risk of its UUID colliding with UUIDs of any other datastore, such as an ancestor or child in a hierarchy of LUN snapshots.

Resignature a VMFS Datastore Copy

Use datastore resignaturing if you want to retain the data stored on the VMFS datastore copy.

Prerequisites

To resignature a mounted datastore copy, first unmount it.

Before you resignature a VMFS datastore, perform a storage rescan on your host so that the host updates its view of LUNs presented to it and discovers any LUN copies.

Procedure

1 Log in to the vSphere Client and select the server from the inventory panel. 2 Click the Configuration tab and click Storage in the Hardware panel.

3Click Add Storage.

4Select the Disk/LUN storage type and click Next.

5From the list of LUNs, select the LUN that has a datastore name displayed in the VMFS Label column and click Next.

The name present in the VMFS Label column indicates that the LUN is a copy that contains a copy of an existing VMFS datastore.

6Under Mount Options, select Assign a New Signature and click Next.

7In the Ready to Complete page, review the datastore configuration information and click Finish.

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VMware, Inc.

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