HP StoreEasy 3830 Gateway Storage/S-Buy User Manual download pdf (Page 74)

NFS shadow copies

UNIX users can independently access previous versions of files stored on NFS shares via the NFS

client; no additional software is required. Server for NFS exposes each of a share's available shadow

copies as a pseudo-subdirectory of the share. Each of these pseudo-subdirectories is displayed in

exactly the same way as a regular subdirectory is displayed.

The name of each pseudo-subdirectory reflects the creation time of the shadow copy, using the format

.@GMT-YYYY.MM.DD-HH:MM:SS. To prevent common tools from needlessly enumerating the

pseudo-subdirectories, the name of each pseudo-subdirectory begins with the dot character, thus

rendering it hidden.

The following example shows an NFS share named “NFSShare” with three shadow copies, taken on

April 27, 28, and 29 of 2003 at 4 a.m.

NFSShare

.@GMT-2003.04.27-04:00:00

.@GMT-2003.04.28-04:00:00

.@GMT-2003.04.29-04:00:00

Access to NFS shadow copy pseudo-subdirectories is governed by normal access-control mechanisms

using the permissions stored in the file system. Users can access only those shadow copies to which

they have read access at the time the shadow copy is taken. To prevent users from modifying shadow

copies, all pseudo-subdirectories are marked read-only, regardless of the user's ownership or access

rights, or the permissions set on the original files.

Server for NFS periodically polls the system for the arrival or removal of shadow copies and updates

the root directory view accordingly. Clients then capture the updated view the next time they issue a

directory read on the root of the share.

Recovery of files or folders

There are three common situations that may require recovery of files or folders:

• Accidental file deletion, the most common situation

• Accidental file replacement, which may occur if a user selects Save instead of Save As

• File corruption

It is possible to recover from all of these scenarios by accessing shadow copies. There are separate

steps for accessing a file compared to accessing a folder.

Recovering a deleted file or folder

To recover a deleted file or folder within a folder:

1. Access to the folder where the deleted file was stored.

2. Position the cursor over a blank space in the folder. If the cursor hovers over a file, that file is

selected.

3. Right-click, select Properties from the bottom of the menu, and then click the Previous Versions

tab.

4. Select the version of the folder that contains the file before it was deleted, and then click View.

5. View the folder and select the file or folder to recover. The view may be navigated multiple folders

deep.

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HP StoreEasy 3830 Gateway Storage/S-Buy User Manual Page 74