vSphere Storage - ESXi 5.1 - Documentation - VMware

vSphere Storage
Resignature a VMFS Datastore Copy in the vSphere Client
Use datastore resignaturing if you want to retain the data stored on the VMFS datastore copy.
When resignaturing a VMFS copy, ESXi 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:
n Datastore resignaturing is irreversible.
n The LUN copy that contains the VMFS datastore that you resignature is no longer treated as a LUN copy.
n A spanned datastore can be resignatured only if all its extents are online.
n The resignaturing process is crash and fault tolerant. If the process is interrupted, you can resume it later.
n You 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.
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.
3 Click Add Storage.
4 Select the Disk/LUN storage type and click Next.
5 From 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.
6 Under Mount Options, select Assign a New Signature and click Next.
7 In the Ready to Complete page, review the datastore configuration information and click Finish.
What to do next
After resignaturing, you might have to do the following:
n If the resignatured datastore contains virtual machines, update references to the original VMFS datastore
in the virtual machine files, including .vmx, .vmdk, .vmsd, and .vmsn.
n To power on virtual machines, register them with vCenter Server.
Resignature a VMFS Datastore Copy in the vSphere Web Client
Use datastore resignaturing if you want to retain the data stored on the VMFS datastore copy.
When resignaturing a VMFS copy, ESXi assigns a new signature (UUID) to the copy, and mounts the copy as
a datastore distinct from the original. All references to the original signature from virtual machine configuration
files are updated.
164 VMware, Inc.