System information

Procedure
1 Display the datastores.
2 Right-click the datastore to unmount and select Unmount.
3 If the datastore is shared, specify which hosts should no longer access the datastore.
a If needed, deselect the hosts where you want to keep the datastore mounted.
By default, all hosts are selected.
b Click Next.
c Review the list of hosts from which to unmount the datastore, and click Finish.
4 Confirm that you want to unmount the datastore.
Resignaturing VMFS Copies
Use datastore resignaturing to retain the data stored on the VMFS datastore copy. When resignaturing a VMFS
copy, ESX/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.
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.
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.
Chapter 6 Managing ESX/ESXi Systems That Use SAN Storage
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