Cisco Systems MDS 9000 Manual De Usuario

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Server-less (or server-free) backup involved the task of moving backup data from a disk to a tape without the data

traversing the application server itself. In server-less backup, a snapshot of the data to be backed up is taken with

minimal or no disruption to applications on the server. The snapshot of the data is then moved intelligently from disk

to tape without going through the server. This process alleviates additional CPU load on the application server as it

is not in the backup path. The mechanism used to move data directly between disk and tape is the SCSI extended

copy command. The component that performs the extended copy SCSI commands can be located in the SAN fabric

or server software. Current implementations of server-less backup, such as Legato Celestra Power and Veritas

NetBackup, manage the whole process via the backup server. A typical server-less backup scenario is depicted in

the figure below. Most customers currently prefer to deploy separate SANs for backup due to a concern for

segregated domains. Hence they may not deploy this solution as the disk subsystem and tape drive must coexist

on the same SAN.

Tape Drives
Dedicated to
Application
Servers

Backup

Server

Application

Servers

Backup

SAN

Ethernet
Network

Clients