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(1)

Using NAS as a Gateway to

SAN

Dave Rosenberg

Hewlett-Packard Company

825 14th Street SW

Loveland, CO 80537 [email protected]

(2)

Using NAS as a Gateway to

SAN

• Network Attached Storage (NAS) is a

purpose-built device (appliance) that presents file systems to client systems via a network. • A Storage Area Network (SAN) is a dedicated

network of interconnected storage and

servers that offers any-to-any communication between these devices and allows multiple servers to access the same storage device independently.

(3)

Using NAS as a Gateway to

SAN

• Can you connect a NAS device into a SAN so network clients get efficient file system

access to all that SAN storage?

(4)

Overview

• The need for storage is growing at an unprecedented rate.

• How to meet that need and keep IT budgets under control remains at the forefront for

most enterprise system managers.

• NAS and SAN are two technologies that can help.

(5)

NAS

• NAS devices are essentially dedicated

file servers.

• A NAS device consists of:

– Processor

– Network interface – Disk storage

(6)
(7)

Benefits of NAS

• Multiple file system access (Heterogeneous):

– Windows (SMB/CIFS) – UNIX (NFS)

• Inexpensive implementation

– Ease of installation on the network – Ease of maintenance

• Protection against hardware failures • Embedded Virus protection

(8)

SAN

• SAN provides an efficient method for

linking storage systems.

• SAN consist of:

– Storage devices – Servers (Hosts)

– HBA (Host Bus Adapters)

(9)

Benefits of SAN

• SAN allows scaling of storage to match individual server (user) needs.

– Can easily grow by attaching additional storage devices.

• Provide raw block level storage access. • Allow general purpose servers.

• Multiple vendors’ devices can be managed as a single storage pool.

(10)

SAN Architecture

FC-AL 9 8 7 6 5 4 3 2

1 10 11 12 13 14 15

VA CC B upgrade VA CC A

FC Int FC Host

PS + FanPS + Fan

VA7100 Array

363636 36 36 36 36 36 36 36 36 36 36 36 36

9 8 7 6 5 4 3 2

1 10 11 12 13 14 15

VA CC B upgrade VA CC A

FC Int FC Host

PS + Fan PS + Fan

VA7100 Array Windows Server UNIX Server SD

4567 891011 10/10 0 BASE T X

1 2

3

5 411 Ent erp ris e Switch POWER M GM T 45 6789 1 0 1111223333

3 R R 1000 BASE X AM BER = GREEN = F LASHING GREEN = ACT IVITY LINK OK DISABLED

S D HEWLETT PACKA RD S D HEWLETT P ACKARD LAN SAN S D

Profess ional Workst at ion 6000

PR O

S D

P rof essional Work st ation 6000

PR O

(11)

Storage Allocation

• Storage in a SAN is allocated to servers by Logical Unit Numbers (LUNS)

• Server Level Control

– Access governed at each SAN server

– Requires special software on each server

• Access Control Within the Network

– Managed within network switches by “zoning” port connections

(12)

Access Control Within the

Network

9 8 7 6 5 4 3 2

1 10 11 12 13 14 15

VA CC B upgrade VA CC A

FC Int FC Host

PS + Fan PS + Fan VA7100 Array

363636 36 36 36 36 36 36 36 36 36 36 36 36

9 8 7 6 5 4 3 2

1 10 11 12 13 14 15

VA CC B upgrade VA CC A

FC Int FC Host

PS + Fan PS + Fan VA7100 Array LUN 0

LUN 1

LUN 2 LUN 3

Visible LUNs: LUN 0, LUN 1 Visible LUNs: LUN 2, LUN 3

Windows Server

UNIX Server

SD

4 5 6 7 8 91011

10/100 BASE TX

1 2 3

5411 Enterprise Switch POWER MGMT

456789 10 11 1

12 23 33 3 3R R 1000 BASE X

AM BER = GREEN = FLASHING GREEN = ACTIVITY LINK OK DISABLED SD H EWLETT P ACKARD S D HEWL ETT PACKA RD

Ports 1 and 2 "Zoned"

Ports 5and 6 "Zoned" LAN

(13)

Storage Allocation

• Access Control Within the Storage

Array

– Most secure and flexible

– Access governed by storage array – Utilizes unique “World-Wide-Name”

– Requires “LUN masking” tables at each array

(14)

Access Control by the Storage

Array

FC-AL 9 8 7 6 5 4 3 2

1 10 11 12 13 14 15

VA CC B upgrade VA CC A

FC Int FC Host

PS + Fan PS + Fan VA7100 Array

363636 36 36 36 36 36 36 36 36 36 36 36 36

9 8 7 6 5 4 3 2

1 10 11 12 13 14 15

VA CC B upgrade VA CC A

FC Int FC Host

PS + Fan PS + Fan VA7100 Array LUN 0

LUN 1

LUN 2 LUN 3 Array 1 LUN Masking Table:

0x000011110000ABF0, LUN 0, WRITE

Array 2 LUN Masking Table:

0x000011110000ABF1, LUN 2, WRITE 0x000011110000ABF1, LUN 3, WRITE HBA WWN:0x000011110000ABF0

Visible LUNs: LUN 0

HBA WWN: 0x000011110000ABF1 Visible LUNs: LUN 2,LUN 3 Windows

Server

UNIX Server

SD

4567 891011 10/ 100 BA SE TX

1 2

3 5411 Ent erpris e S wit ch POW ER M GMT 4 5 6 7 8 9 10 1111223333

3 R R 1000 B AS E X AMBER = GREEN = FLA SHI NG GREE N = A CTIV ITY LINK OK DISA BLED

S D HEWLETT PAC KARD S D HEWL ETT PACKARD LAN

(15)

NAS and SAN Together

• Increasing volume requirements are pushing the bandwidth and performance limits of

traditional NAS.

• The net effect is a convergence of NAS and SAN technologies.

• The combining of NAS and SAN, referred to as “NAS/SAN fusion” allows IT managers to capitalize on the advantages of both

(16)

NAS/SAN Fusion

• NAS/SAN fusion results in significant benefit to IT managers and system users..

• The “head” of the NAS is used as a dedicated file server.

• The SAN becomes a pool of storage for use by the NAS head.

• Thus, the NAS head becomes a file level “gateway” into the SAN.

(17)

NAS/SAN Fusion

• General purpose servers placed on a SAN are either Windows or UNIX file system

based.

– NAS/SAN fusion provides both Windows and UNIX clients access to the same data.

• Backing up NAS can be difficult and is not always reliable.

– With NAS/SAN fusion, the backup of SAN-resident data is collectively controlled by the SAN. Backup is simpler.

(18)

How to Incorporate NAS Into

an Existing SAN

• Incorporating NAS into an existing SAN is not very different from adding any other server on a SAN.

• NAS just happens to be a server dedicated to file sharing.

• If you are converting a stand-alone NAS to operate on a SAN, you may need to add a Fiber Channel HBA to your NAS head.

(19)

How to Incorporate NAS Into

an Existing SAN (cont)

FC-AL 9 8 7 6 5 4 3 2

1 10 11 12 13 14 15

VA CC B upgrade VA CC A

FC Int FC Host

PS + FanPS + Fan

VA7100 Array

363636 36 36 36 36 36 36 36 36 36 36 36 36

9 8 7 6 5 4 3 2

1 10 11 12 13 14 15

VA CC B upgrade VA CC A

FC Int FC Host

PS + FanPS + Fan

VA7100 Array Windows Server UNIX Server SD

4567 891011 10/100 BASE TX

1 2

3

541 1 Ente rprise Switch PO WER MGM T 4 5 6 78 9 10 1 111223333

3R R 1000 BASE X AMBER = GREEN = F LASHING GREEN = ACTIVIT Y LINK OK DISABLED

S D

H EWL ET T PACKARD

SD

HEWL ET T PACKARD

LAN

SAN SD

Pr ofe ssion a l Wor ksta tion 6 000

PRO

SD

Profe ssio na l Wo rkst atio n 6 00 0

P RO

Client Workstatiopns

(20)

How to Incorporate NAS Into

an Existing SAN (cont)

• Identify LUNs to be allocated to NAS. • Use either network zoning or array LUN

masking to make LUNs available to the NAS device.

• Connect the NAS to the IP network and Fiber Channel.

• Configure the NAS on the IP network as defined by the manufacturer.

(21)

How to Incorporate NAS Into

an Existing SAN (cont)

• Configure the NAS Storage

• NAS should automatically “discover” LUNs allocated to it

• Create Volumes from LUNs

• Create Volume Groups from Volumes • Create File Systems across Volumes

• Expose File Systems as either Windows “Shares” or UNIX “Exports”

(22)

The Future of NAS/SAN

Fusion

• NAS and SAN management tasks are

segregated and require human oversight. • Market demand requires devices from

multiple manufacturers to coexist and be managed by a centralized Storage Area Manager.

• Several developers are moving towards

achieving this interoperability based on the “Common Information Model (CIM)”.

(23)

The Future of NAS/SAN

Fusion

References

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