Impact of NAS and SAN on Distributed File Systems
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Page 1 of 23 NFS Vendors ConferenceOctober 25, 2000
Impact of NAS and SAN on Distributed File Systems
Steve Widen
Research Director, Storage Software
IDC
1
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Page 2 of 23 NFS Vendors ConferenceOctober 25, 2000
Agenda• What is a Distributed File System?
• What is NFS?
• Distributed files systems revenues and forecast
• Storage software trends
• NAS Vs. SAN and distributed file systems
• Customer drivers
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Page 3 of 23 NFS Vendors ConferenceOctober 25, 2000
What is a Distributed File System (DFS)?
“DFS software allows systems or nodes to appear to access a common file system even though the actual storage devices may be located on another system or node.”
IDC, 2000
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Examples of Distributed File Systems• Sun (NFS)
• Common Internet File System (CIFS)
• Novell (NetWare File System)
• Transarc (AFS and DFS)
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What is NFS?
• Created by Sun Microsystems in 1987 as an open standard distributed file system
• Open specification adopted by most workstation/PC vendors
• Allows workstations to share a file system that exists on a central server
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Page 6 of 23 NFS Vendors ConferenceOctober 25, 2000
1999 DFS Revenue by Operating Environment
Unix52%
Linux/OOS
3%
Embedded28%
32-bit Windows 14%
Mainframe
2%
OS/4001%
Source: IDC, 2000
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1999 DFS Revenue by Region
N. America73%
REMEA2%
Japan4%W. Europe
16%
L. America1%
A/P4%
Source: IDC, 2000
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DFS Revenue Forecast
0
50
100
150
200
250
300
350
1 2 3 4 5 6
1999 2000 2001 2002 2003 2004
($M)
Source: IDC, 2000
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Page 9 of 23 NFS Vendors ConferenceOctober 25, 2000
Storage Software Trends• SAN acceptance continues
• Competing SAN management frameworks– CA and SAN Integrated Technology Initiative
(SANITI)
– Sun and Federated Management Architecture Specification (FMA) = Jiro from Sun
– VERITAS V3 SAN Initiative = SANPoint
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Page 10 of 23 NFS Vendors ConferenceOctober 25, 2000
Storage Software Trends
• Virtualization, data sharing and file systems
• Growth of xSP Market
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Page 11 of 23 NFS Vendors ConferenceOctober 25, 2000
Storage Software Trends
• Four SAN Management Models– Server centric (Sun)
– Storage centric (EMC)
– SAN appliances (Compaq)
– SAN switches and routers
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Storage Software Trends
• SAN Vs. NAS– Are they mutually exclusive?
– Does a SAN need to be FC?
– Storage over IP
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NAS Vs. SAN and DFSSAN NAS
Protocol FCP, SerialSCSI
NFS, CIFS
Network Fibre channel Ethernet
Source/Target Server/Device Client/Server,Server/Server
Transferobjects
Device blocks Files
Storage deviceconnection
Direct onnetwork
I/O bus orchannel onserver
Embedded filesystem
No Yes
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Page 14 of 23 NFS Vendors ConferenceOctober 25, 2000
NAS Vs. SAN
• SAN is a network while a NAS is typically file server or intelligent file-aware device
• SAN implies dedicated network as I/O channel between storage and servers
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NAS Vs. SAN
• SAN can include block (SCSI) and file-oriented (NAS) storage
• NAS products can connect to storage devices over a SAN
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NAS Topology
ClientsNAS server
Ethernet
Ope
rati
ng
Sys
tem
Integrated storage
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FC SAN Topology
FC channel storage subsystems
ServerStoragenetwork
FCP
FCP
FCP
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IP SAN Topology
Server
IPStoragenetwork
IP
IP
IP
(NFS orCIFS)
NAS servers
(NFS orCIFS)
(NFS orCIFS)
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NAS and SAN Topology
Storagedevice
Server
Clients
Ethernetnetwork IP orTCP/IP
SerialSCSI
Storagenetwork
NAS serverIP
SerialSCSI
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Page 20 of 23 NFS Vendors ConferenceOctober 25, 2000
Customer Drivers
• Storage management solutions need to revolve around the application
• Requirement of a full solution, no longer accept point products in most cases
• Storage software solutions need to be based on standards
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Page 21 of 23 NFS Vendors ConferenceOctober 25, 2000
Customer Drivers
• Need to solve the availability of data issue which is critical to running the business
• Need to access different data types from different operating environments
• Lack of trained IT staff, ex PC Helpdesk and FC SAN expertise
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Page 22 of 23 NFS Vendors ConferenceOctober 25, 2000
Questions
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Page 23 of 23 NFS Vendors ConferenceOctober 25, 2000