HP StorageWorks 9000s NAS 4000s and 9000s Administration Guide - Page 63

Storage Management Overview can not be utilized for shares that will be shared using Microsoft Services for Unix (NFS). They can be setup with both but the use of the mount point in conjunction with NFS shares causes instability with the NFS shares. Formats consist of NTFS, FAT32, and FAT and all three types can be used on the NAS device. However, the Volume Shadow Copy Service can only utilize volumes that are NTFS formatted. Also, quota management is possible only on NTFS. Volume Shadow Copy Service Overview The Volume Shadow Copy Service (VSS) provides an infrastructure for creating point-in-time snapshots (shadow copies) of volumes. VSS supports 64 shadow copies per volume. Shadow Copies of Shared Folders resides within this infrastructure and helps alleviate data loss by creating shadow copies of files or folders that are stored on network file shares at pre-determined time intervals. In essence, a shadow copy is a previous version of the file or folder at a specific point in time. By using shadow copies, a NAS server can maintain a set of previous versions of all files on the selected volumes. End users access the file or folder by using a separate client add-on program, which enables them to view the file in Windows Explorer. Shadow copies should not replace the current backup, archive, or business recovery system, but they can help to simplify restore procedures. For example, shadow copies cannot protect against data loss due to media failures, however, recovering data from shadow copies can reduce the number of times needed to restore data from tape. Detailed information on Shadow Copies can be found in Chapter 5 of this guide. File System Elements File system elements are composed of the folders and subfolders that are created under each Logical Storage element (partitions, logical disks, and volumes). Folders are used to further subdivide the available file system providing another level of granularity for management of the information space. Each of these folders can contain separate permissions and share names that can be used for network access. Folders can be created for individual users, groups, projects, and so on. Detailed information on file system elements can be found in Chapter 7 of this guide. File-Sharing Elements The NAS server supports several file sharing protocols, including DFS, NFS, FTP, HTTP, and Microsoft SMB. On each folder or Logical Storage element, different file sharing protocols can be enabled using specific network names for access across a network to a variety of clients. Permissions can then be granted to those shares based on users or groups of users in each of the file sharing protocols. Detailed information on file-sharing elements can be found in Chapter 7 of this guide. NAS 4000s and 9000s Administration Guide 63