IBM E16RMLL-I Implementation Guide - Page 598

Server-free setup requirements

Page 598 highlights

The Tivoli Storage Manager client allows server-free backup and restore of volume images between different volume layouts, with the exception of software-based RAID-5 volumes and software-striped volumes. When restoring a software-based mirror volume (RAID-1), Tivoli Storage Manager restores to the primary copy only and uses the operating system to resynchronize the stale mirrors. The client supports volume layouts such as striped and mirrored only on Windows 2000 dynamic disks. Server-free data movement has the following advantages: It reduces Tivoli Storage Manager client and server CPU utilization. With data movement operations being performed by an outboard copy engine, the client or server CPU will not be utilized for data movement and will thus be available for other applications. It eliminates data movement on the LAN. Implementation of the SCSI-3 extended copy command will cause the data to be transferred directly between devices over the SAN or SCSI bus. It improves performance for data movement operations. Direct transfer between devices through a high speed Fibre Channel should perform better than our current mode that utilizes a slower network connection with multiple buffer copy operations in the client and server processors. It improves scalability. The Tivoli Storage Manager server will be able to handle more concurrent client connections and server operations because it will not be copying data. The Tivoli Storage Manager client processor will likewise be able to handle more application load because cycles will not be needed to read and send data buffers to the server 17.2 Server-free setup requirements The SAN should be already configured in order to perform server-free data movement. The hardware specifications provided below only depict one successful implementation of server-free data movements. There can be other possible hardware that can be used to set up server-free data movement. Our test environment used the following configuration. Note that some of the hardware/software/device drivers are not at the latest level. However, the setup and operation procedure for the server-to-server function has not changed substantially. To see a list of the latest hardware/software/HBA/device driver levels, see: Hardware - Tivoli Storage Manager Server: • IBM xSeries® server 568 IBM Tivoli Storage Manager Implementation Guide

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568
IBM Tivoli Storage Manager Implementation Guide
The Tivoli Storage Manager client allows server-free backup and restore of
volume images between different volume layouts, with the exception of
software-based RAID-5 volumes and software-striped volumes. When restoring
a software-based mirror volume (RAID-1), Tivoli Storage Manager restores to the
primary copy only and uses the operating system to resynchronize the stale
mirrors. The client supports volume layouts such as striped and mirrored only on
Windows 2000 dynamic disks.
Server-free data movement has the following advantages:
±
It reduces Tivoli Storage Manager client and server CPU utilization. With data
movement operations being performed by an outboard copy engine, the client
or server CPU will not be utilized for data movement and will thus be available
for other applications.
±
It eliminates data movement on the LAN. Implementation of the SCSI-3
extended copy command will cause the data to be transferred directly
between devices over the SAN or SCSI bus.
±
It improves performance for data movement operations. Direct transfer
between devices through a high speed Fibre Channel should perform better
than our current mode that utilizes a slower network connection with multiple
buffer copy operations in the client and server processors.
±
It improves scalability. The Tivoli Storage Manager server will be able to
handle more concurrent client connections and server operations because it
will not be copying data. The Tivoli Storage Manager client processor will
likewise be able to handle more application load because cycles will not be
needed to read and send data buffers to the server
17.2
Server-free setup requirements
The SAN should be already configured in order to perform server-free data
movement. The hardware specifications provided below only depict one
successful implementation of server-free data movements. There can be other
possible hardware that can be used to set up server-free data movement.
Our test environment used the following configuration. Note that some of the
hardware/software/device drivers are not at the latest level. However, the setup
and operation procedure for the server-to-server function has not changed
substantially. To see a list of the latest hardware/software/HBA/device driver
levels, see:
±
Hardware
Tivoli Storage Manager Server:
IBM xSeries® server