HP StorageWorks 4000s NAS 4000s and 9000s Administration Guide - Page 108

Shadow Copies 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. As documented previously, the use of the snapshots are from the network and are based on shares created on the NAS server. 108 NAS 4000s and 9000s Administration Guide