Adaptec AEC-4412B Uživatelský manuál stáhnout pdf (Strana 5)

CQ-1001 / Page 5 of 14

US

6,425,035

B2

3

through

a

network

server.

As

shown,

network

10

includes

a

plurality

of

workstations

12

interconnected

with

a

network

server

14

via

a

network

transport

medium

16.

Each

work-

station

12

can

generally

comprise

a

processor,

memory,

input/output

devices,

storage

devices

and

a

network

adapter

as

well

as

other

common

computer

components.

Network

server

14

uses

a

SCSI

bus

18

as

a

storage

transport

medium

to

interconnect

with

a

plurality

of

storage

devices

20

(tape

drives,

disk

drives,

etc.).

In

the

embodiment

of

FIG.

1,

network

transport

medium

16

is

an

network

connection

and

storage

devices

20

comprise

hard

disk

drives,

although

there

are

numerous

alternate

transport

mediums

and

storage

devices.

In

network

10,

each

workstation

12

has

access

to

its

local

storage

device

as

well

as

network

access

to

data

on

storage

devices

20.

The

access

to

a

local

storage

device

is

typically

through

native

low

level,

block

protocols.

On

the

other

hand,

access

by

a

workstation

12

to

storage

devices

20

requires

the

participation

of

network

server

14

which

implements

a

file

system

and

transfers

data

to

workstations

12

only

through

high

level

file

system

protocols.

Only

network

server

14

communicates

with

storage

devices

20

via

native

low

level,

block

protocols.

Consequently,

the

network

access

by

work-

stations

12

through

network

server

14

is

slow

with

respect

to

their

access

to

local

storage.

In

network

10,

it

can

Also

be

a

logistical

problem

to

centrally

manage

and

administer

local

data

distributed

across

an

organization,

including

accomplishing

tasks

such

as

backups,

virus

scanning

and

redundancy.

FIG.

2

is

a

block

diagram

of

one

embodiment

of

a

storage

network,

indicated

generally

at

30,

with

a

storage

router

that

provides

global

access

and

routing.

This

environment

is

significantly

different

from

that

of

FIG.

1

in

that

there

is

no

network

server

involved.

In

FIG.

2,

a

Fiber

Channel

high

speed

serial

transport

32

interconnects

a

plurality

of

work-

stations

36

and

storage

devices

38.

A

SCSI

bus

storage

transport

medium

interconnects

workstations

40

and

storage

devices

42.

A

storage

router

44

then

serves

to

interconnect

these

mediums

and

provide

devices

on

either

medium

global,

transparent

access

to

devices

on

the

other

medium.

Storage

router

44

routes

requests

from

initiator

devices

on

one

medium

to

target

devices

on

the

other

medium

and

routes

data

between

the

target

and

the

initiator.

Storage

router

44

can

allow

initiators

and

targets

to

be

on

either

side.

In

this

manner,

storage

router

44

enhances

the

functionality

of

Fiber

Channel

32

by

providing

access,

for

example,

to

legacy

SCSI

storage

devices

on

SCSI

bus

34.

In

the

embodi-

ment

of

FIG.

2,

the

operation

of

storage

router

44

can

be

managed

by

a

management

station

46

connected

to

the

storage

router

via

a

direct

serial

connection.

In

storage

network

30,

any

workstation

36

or

workstation

40

can

access

any

storage

device

38

or

storage

device

42

through

native

low

level,

block

protocols,

and

vice

versa.

This

functionality

is

enabled

by

storage

router

44

which

routes

requests

and

data

as

a

generic

transport

between

Fiber

Channel

32

and

SCSI

bus

34.

Storage

router

44

uses

tables

to

map

devices

from

one

medium

to

the

other

and

distributes

requests

and

data

across

Fiber

Channel

32

and

SCSI

bus

34

without

any

security

access

controls.

Although

this

exten-

sion

of

the

high

speed

serial

interconnect

provided

by

Fiber

Channel

32

is

beneficial,

it

is

desirable

to

provide

security

controls

in

addition

to

extended

access

to

storage

devices

through

a

native

low

level,

block

protocol.

FIG.

3

is

a

block

diagram

of

one

embodiment

of

a

storage

network,

indicated

generally

at

50,

with

a

storage

router

that

provides

virtual

local

storage.

Similar

to

that

of

FIG.

2,

storage

network

50

includes

a

Fiber

Channel

high

speed

5

10

15

20

25

30

35

40

45

50

55

60

65

4

serial

interconnect

52

and

a

SCSI

bus

54

bridged

by

a

storage

router

56.

Storage

router

56

of

FIG.

3

provides

for

a

large

number

of

workstations

58

to

be

interconnected

on

a

common

storage

transport

and

to

access

common

storage

devices

60,

62

and

64

through

native

low

level,

block

protocols.

According

to

the

present

invention,

storage

router

56

has

enhanced

functionality

to

implement

security

controls

and

routing

such

that

each

workstation

58

can

have

access

to

a

specific

subset

of

the

overall

data

stored

in

storage

devices

60, 62

and

64.

This

specific

subset

of

data

has

the

appearance

and

characteristics

of

local

storage

and

is

referred

to

herein

as

virtual

local

storage.

Storage

router

56

allows

the

con-

figuration

and

modification

of

the

storage

allocated

to

each

attached

workstation

58

through

the

use

of

mapping

tables

or

other

mapping

techniques.

As

shown

in

FIG.

3,

for

example,

storage

device

60

can

be

configured

to

provide

global

data

65

which

can

be

accessed

by

all

workstations

58.

Storage

device

62

can

be

configured

to

provide

partitioned

subsets

66, 68,

70

and

72,

where

each

partition

is

allocated

to

one

of

the

workstations

58

(workstations

A,

B,

C

and

D).

These

subsets

66, 68, 70

and

72

can

only

be

accessed

by

the

associated

workstation

58

and

appear

to

the

associated

workstation

58

as

local

storage

accessed

using

native

low

level,

block

protocols.

Similarly,

storage

device

64

can

be

allocated

as

storage

for

the

remaining

workstation

58

(workstation

Storage

router

56

combines

access

control

with

routing

such

that

each

workstation

58

has

controlled

access

to

only

the

specified

partition

of

storage

device

62

which

forms

virtual

local

storage

for

the

workstation

58.

This

access

control

allows

security

control

for

the

specified

data

parti-

tions.

Storage

router

56

allows

this

allocation

of

storage

devices

60,

62

and

64

to

be

managed

by

a

management

station

76.

Management

station

76

can

connect

directly

to

storage

router

56

via

a

direct

connection

or,

alternately,

can

interface

with

storage

router

56

through

either

Fiber

Channel

52

or

SCSI

bus

54.

In

the

latter

case,

management

station

76

can

be

a

workstation

or

other

computing

device

with

special

rights

such

that

storage

router

56

allows

access

to

mapping

tables

and

shows

storage

devices

60, 62

and

64

as

they

exist

physically

rather

than

as

they

have

been

allocated.

The

environment

of

FIG.

3

extends

the

concept

of

a

single

workstation

havinglocally

connected

storage

devices

to

a

storage

network

50

in

which

workstations

58

are

provided

Virtual

local

storage

in

a

manner

transparent

to

workstations

58.

Storage

router

56

provides

centralized

control

of

what

each

workstation

58

sees

as

its

local

drive,

as

well

as

what

data

it

sees

as

global

data

accessible

by

other

workstations

58.

Consequently,

the

storage

space

considered

by

the

workstation

58

to

be

its

local

storage

is

actually

a

partition

(i.e.,

logical

storage

definition)

of

a

physically

remote

stor-

age

device

60,

62

or

64

connected

through

storage

router

56.

This

means

that

similar

requests

from

workstations

58

for

access

to

their

local

storage

devices

produce

different

accesses

to

the

storage

space

on

storage

devices

60,

62

and

64.

Further,

no

access

from

a

workstation

58

is

allowed

to

the

virtual

local

storage

of

another

workstation

58.

The

collective

storage

provided

by

storage

devices

60,

62

and

64

can

have

blocks

allocated

by

programming

means

within

storage

router

56.

To

accomplish

this

function,

stor-

age

router

56

can

include

routing

tables

and

security

controls

that

define

storage

allocation

for

each

workstation

58.

The

advantages

provided

by

implementing

Virtual

local

storage

in

centralized

storage

devices

include

the

ability

to

do

collective

backups

and

other

collective

administrative

func-

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