ATTO Technology FastStream NDMP 4600, Инструкция по установке и эксплуатации

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ATTO Technology Inc. FastStream Installation and Operation Manual
1 ATTO FastStream NDMP 4600 features
The ATTO FastStream
TM
NDMP 4600 offers performance, security and reliability using NDMP
(Network Data Management Protocol) for backup of network attached storage (NAS).
NDMP is an open protocol for managing data stored
on network-attached storage devices such as tape and
disks, controlling data backup and recovery between
primary and secondary storage.
The ideal backup solution for an NAS filer is to attach
a tape library directly to the network through the
ATTO FastStream NDMP 4600 to take advantage of
the improved management control and operating
efficiency of shared backup. The FastStream NDMP
4600 controls the backup process, enabling filers to
perform at maximum capacity.
The ATTO FastStream NDMP 4600, using the NDMP
Version 4 Protocol Specification, allows you to back
up critical data locally using any combination of
network-attached servers, backup devices and
management applications from a central control,
without taxing network traffic, by separating the data
path and the control path.
How NDMP works
The NDMP protocol allows data backup and
restoration over Ethernet networks using file-level
commands, rather than block-level IO instructions.
The typical NDMP setup includes
• a Data Server (usually disks)
• a Tape Server
• a client in control of the backup process called a
Data Management Application (DMA).
The DMA controls the NDMP session.
There is a master-slave relationship between
the DMA and the data/tape servers. The
FastStream NDMP 4600 implements the
Tape Service, along with a SCSI Service, to
provide access to media changer devices.
A typical NDMP application involves a
drive array, a Host Computer and a tape
library. The Host Computer may be attached
to the disk and tape drives by any of several
methods/technologies. The FastStream
NDMP 4600 uses Ethernet and Internet protocols.
The following example is a typical NDMP DMA, Data
Server and Tape Server interaction.
1 The DMA sends messages to the tape library’s
SCSI Server to pick the appropriate cartridge
and load it in the tape drive.
2 The DMA sends commands to the tape drive to
position the tape and configure the tape for
writing (block size, etc.).
3 The DMA opens a connection to the Data
Server to exchange backup information.
4 The DMA commands the Tape Server to
prepare to receive data.
5 The Tape Server responds with addressing
information.
6 The DMA passes the address to the Data
server.
7 The Data Server and Tape Server send data
directly to each other.
8 Metadata generated by the DMA is written to
tape to indicate the end of files, directories, path
names, etc., passed through to the tape server
between backup data transfers.
• NDMP uses a windowing mechanism in
which the Tape Server writes a portion of the
data, then pauses and waits for the DMA to
take charge. The DMA may start a new
window or write some Metadata.
Tape Server
(L FastStream NDMP 4600)
Data Server
`
Backup Data
Control
C Metadata