Backup - Fujitsu ETERNUS DX S5 Series Design Manual

4. NAS Functions

Backup

Caution
During the operation phase
For some NFS clients, executing the "df" command may display the snapshot directory as a mount
point if the following conditions are all satisfied.
• NFS mount the NFS shared folder or the CIFS/NFS shared folder.
• Execute the "df" command in the NFS client immediately after accessing the snapshot directory from
the NFS client.
The snapshot directories that are output with the "df" command are automatically mounted by the
NFS client. If no access is attempted from the NFS client to the snapshot directory for a certain period
of time, the NFS client automatically unmounts the directory. The time to automatically unmount the
directory depends on the specifications of the NFS client.
Backup
The ETERNUS DX links ETERNUS SF AdvancedCopy Manager and performs high-speed backups and restorations
by using the Advanced Copy function. Each NAS user volume is copied. QuickOPC can be used for local copies. For
the remote copies, Remote Equivalent Copy (REC) is available. Copying from the ETERNUS DX to other cabinets
uses SAN connections to transfer data.
For details on backup and restoration of NAS volumes, refer to "ETERNUS SF Web Console Manual". For details on
backup between multiple storage systems using REC, refer to "ETERNUS SF AdvancedCopy Manager Operation
Guide for Copy Control Module".
Note
• If an ETERNUS DX S5 series is used as the remote copy source, volumes can be backed up to older
storage systems as the remote copy destination. However, the backup volumes cannot be restored to
NAS volumes in the older storage system.
• If an older storage system is used as the remote copy source, volumes can be backed up to an ETERNUS
DX S5 series as the remote copy destination. In addition, the backup volumes can be restored to the
ETERNUS DX S5 series. However, if the file system version of the older storage system is changed to "5",
back up the volumes to an ETERNUS DX S5 series. In addition, RID (default) must be set as the ID
management method.
• If backups are performed using remote copies, ADS is not inherited by the backup destination.
• Use the same ID management method in both the remote copy source and destination storage systems.
195 Design Guide