04 - IBM NAS Fundamentals v1.4_unlocked

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Global Delivery Center Argentina

May 2008 | IBM Confidential © 2008 IBM Corporation

IBM System Storage ™ NAS Fundamentals GDC Argentina – “Storage Systems and SAN Team”

DAS/SAN review What is NAS NAS / IP Networks FTP/HTTP/NFS/CIFS Differences NFS/CIFS Diferences NAS/SAN

© 2007 IBM CorporationIBM Confidential

Server

HBA Fibre Channel

Ethernet to Clientworkstations

Dual independent controllers with automatic fail-over for continuous availability in case one controller or one fiber link fails.

HBA Fibre Channel

Controller

Controller

Fibre Channel

Fibre Channel

Fibre Channel subsystem- DS3000 and DS4000

RAID

We discussed in SAN Fundamentals I :


NAS Fundamentals

DAS/SAN review What is NAS NAS / IP Networks FTP/HTTP/NFS/CIFS Differemces NFS/CIFS Diferences NAS/SAN


We discussed in SAN Fundamentals 2

Switch

Switch

Switch

Switch

NAS

NAS

NAS

RAID

A B

A B

A B

A B

A B

A B

Storage Area Network

(SAN)

A B

Storage subsystem

Servers

ServersNetwork Attached Storage

(NAS)


Distributed Information


Mainframe

Information

Finance

SupportOperations

Purchasing

NT

UNIX

NAS

Centralizing Information


Unused storage capacity may be easily allocated to servers as need.

Centralizing Information = Value

Distributed Storage Centralized Storage


Today ask our self: What is Network Attached Storage (NAS)?


What is NAS? Network Attached Storage A device that is dedicated to network file sharing. NAS is not a network! NAS uses LAN or WAN protocols i.e. TCP/IP A NAS device can exist anywhere in a LAN or

WAN. Supported Protocols include CIFS, NFS and HTTP NAS does not provide any of the activities that a

server in a server-centric system typically provides, i.e. e-mail.

Quick Reference• Local Area Network (LAN)• Wide Area Network (WAN)• Common Internet File System (CIFS)• Network File System (NFS)• Hyper Text Transfer Protocol (HTTP)


It takes advantage of IP Networks ( 1 / 4)IP Networks client/server infrastructure and

services :

File transfer ftp


It takes advantage of IP Networks ( 2 / 4)IP Networks client/server infrastructure and

services :

File transfer http

Hipertext Transfer Protocol ( HTTP)

Hipertext Transfer Protocol ( HTTP)

Internet


It takes advantage of IP Networks ( 3 / 4)IP Networks client/server infrastructure and services : File share NFS

NFS SERVER

File systems are exported from nfs server and

imported to App server


NFS features A remote file system exported by server and imported by clients

Server and client functions to share data

Improved interoperability with other system platforms, increasing overallnetwork utilization and user productivity

Easy access to files for the end-user of the NFS client system

Uses industry standard TCP/IP protocols

Automounter support, which allows automatic NFS mounting, while the accessing file system is unmounted from the client, to enhance the network load

User authentication, provided by means of RPC use of the data encryptionstandard

Support of access control lists between UNIX systems


It takes advantage of IP Networks ( 4 / 4)IP Networks client/server infrastructure and services : File share CIFS

CIFS SERVER

File systems are exported from nfs server and

imported to App server


Integrity and concurrency

Performance and scalability

Security

Performance and scalability

Server and client functions to share data

Remote files are exported to clients sharing environment

Global file names

CIFS Features


Differences NFS and CIFS NFS was designed by Sun Microsystems to be machine-

independent,operating system-independent, and transport protocol-independent.

CIFS was designed by Microsoft to work on Windows workstations.

NFS servers make their file systems available to other systems in the network by exporting directories and files over the network. An NFS client “mounts” a remote file system from the exported directory location.

CIFS systems create “file shares” which are accessible by authorized users. CIFS authorizes users at the server level.

For directory and file level security, NFS uses UNIX concepts of “User”, “Groups” (sets of users sharing a common ID)

CIFS, however, uses access control lists that are associated with the shares, directories, and files


Main differences SAN and NAS

SAN does not use TCP/IP for data transfers, it is based on fiber hba’s, FC switches, need a specific infrastructure

(despite it can be extended in FC-IP router)

NAS is based on TCP/IP services for data transfers, it can be built on the existing IP Network, using NIC cards already installed.

CAUTION: Network traffic bottlenecks can be caused by use of NAS if

network has high user traffic, and is not improved to handle new NAS traffic.


Appliance

Appliance

Appliance

Application Server

Application Server

Application Server

Storage Models for NAS

Motherboard

SW

• External disks (JBOD) connected via host adapter

• Software RAID

Motherboard

HA

Motherboard

HA

• External storage system connected via host adapter

• Controller-based RAID

Controllers

HA

• External disks (JBOD) connected via host adapter

• Host adapter-based

RAID

File-level access


Advantages of NAS

Leverage current networking infrastructure Heterogeneous data-sharing environments Relatively easy to install and maintain Native OS permissions and file locking

maintained Good performance

Disadvantages of NAS A single NAS server can lead to I/O

bottlenecks Performance penalties


Thanks ! ! !

“Storage Systems & SAN Team”

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04 - IBM NAS Fundamentals v1.4_unlocked