HP Cisco MDS 9020 Cisco MDS 9000 Family Fabric Manager Configuration Guide, Re - Page 1136

About NASB Chapter 58 Configuring NASB Send documentation comments to [email protected] • Manages disks as well as one or more tape backup devices. • Contacts the client devices to retrieve the list of logical blocks that need to be backed up. • Performs data movement from disk to tape media based on the logical block list provided by the client device. The backup application in the client device maps the data to be backed up and creates the logical block list associated with the data. The movement of data from the physical disks to the backup device (tape) is not performed by the client device. This reduces substantial load on the client device. Note The media server, disk, and tape can be located anywhere in the fabric. An example configuration is shown in Figure 58-3. The media server moves the data directly between the storage disks and the tape devices during backups. Figure 58-3 Example Configuration with Media Server as Data Mover Media server Client Logical block (Application server) list SAN Read Write 130079 Storage (disks) Tape library When the NASB is the data mover, it moves the data between the disks and the tapes. The NASB device is a SCSI target device capable of handling SCSI Extended Copy (XCOPY) commands as well as a SCSI initiator device capable of issuing READ/WRITE commands to disks and other backup media, such as tapes. See Figure 58-4. 58-4 Cisco MDS 9000 Family CLI Configuration Guide OL-16184-01, Cisco MDS SAN-OS Release 3.x