Transcript Introduction to Fibre Channel over Ethernet (FCoE)

Fibre Channel over Ethernet (FCoE),
iSCSI and the Converged Data
Center
Joe Rabasca - Solutions Lead
EMC Corporation
© Copyright 2009 EMC Corporation. All rights reserved.
1
Objectives
After this session you will be able to:
 Understand FCoE and iSCSI and how they fit into existing storage and
networking infrastructures.
 Compare and contrast the structure and functionality of the FCoE and
iSCSI protocol stacks.
 Understand how FCoE and iSCSI solutions provide storage networking
options for Ethernet, including 10 Gb Ethernet.
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2
Rack Server Environment Today
Ethernet
Fibre Channel
iSCSI SAN
 Servers connect to FC SAN with
HBAs
1 Gigabit Ethernet
 Many environments today are still
1 Gigabit Ethernet
1 Gigabit Ethernet
1 Gigabit
Ethernet
NICs
Fibre
Channel
HBAs
 Servers connect to LAN, NAS and
iSCSI SAN with NICs
 Multiple server adapters, multiple
cables, power and cooling costs
Ethernet LAN
Fibre Channel SAN
Storage
Rack-mounted
servers
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– Storage is a separate network
(including iSCSI)
Note: NAS will continue to be part
of the solution. Everywhere that you
see Ethernet or 10Gb Ethernet in this
presentation, NAS can be considered
part of the unified storage solution
4
10Gb Ethernet allows for Converged Data Center
 Maturation of 10 Gigabit Ethernet
– 10 Gigabit Ethernet allows replacement of n x 1Gb with a much smaller
number (start with 2) of 10Gb Adapters
– Many storage applications require > 1Gb bandwidth
Single Wire for
10 GbE
Network and Storage
SAN
LAN
 10 Gigabit Ethernet simplifies server, network and storage infrastructure
–
–
–
–
Reduces the number of cables and server adapters
Lowers capital expenditures and administrative costs
Reduces server power and cooling costs
Blade servers and server virtualization drive consolidated bandwidth
10 Gigabit Ethernet is the answer!
iSCSI and FCoE both leverage this inflection point
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5
Why iSCSI?
Initiator
SCSI
Reliable data
transport and
delivery (TCP
Windows, ACKs,
ordering, etc.)
iSCSI
TCP
IP
IPsec
Provides physical
network capability
(Layer 2 Ethernet,
Cat 5, MAC, etc.)
Delivery of iSCSI
Protocol Data Unit (PDU)
for SCSI functionality
(initiator, target, data
read / write, etc.)
Provides IP routing
(Layer 3) capability so
packets can find their
way through the network
Link
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Target
SCSI
iSCSI
TCP
IP
IPsec
Link
IP Network
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Why a New Option for FC Customers?
 FC has a large and well managed install base
– Want a solution that is attractive for customers with FC expertise /
investment
– Previous convergence options did not allow for incremental adoption
 Requirement for a Data Center solution that can provide I/O
consolidation
– 10 Gigabit Ethernet makes this option available
 Leveraging Ethernet infrastructure and skill set has always been
attractive
FCoE allows an Ethernet-based SAN to be introduced
into the FC-based Data Center
without breaking existing administrative tools and workflows
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8
Protocol Comparisons
FC over Ethernet
(no TCP/IP)
App
App
Applications
Applications
SCSI
SCSI
SCSI SCSI
iSCSI
Encapsulation
Encapsulation
Layer
Layer
TCP
IP
Base
Base
Transport
Transport
Block storage
with TCP/IP
FC
FC
iFCP
FCIP
TCP
TCP
IP
IP
FC
FC
FC
SRP
FCoE
FCoE
Ethernet
Ethernet
FC replication
over IP FC management
FC
Infiniband
New transport
and drivers
Low latency,
high bandwidth
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9
FCoE Extends FC on a Single Network
Server sees storage traffic as FC
Network
Driver
FC
Driver
Ethernet
Network
FCoE SW Stack
Standard
10G NIC
Converged
Network Adapter
2
Lossless Ethernet Links
options
FC storage
FC network
Converged
Network Switch
Ethernet
FC
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SAN sees host as FC
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iSCSI and FCoE Framing
 iSCSI is SCSI functionality transported using TCP/IP for delivery and
routing in a standard Ethernet/IP environment
iSCSI Frame
Ethernet
Header
IP
TCP
iSCSI
Data
CRC
TCP/IP and iSCSI require CPU processing
 FCoE is FC frames encapsulated in Layer 2 Ethernet frames designed to
utilize a Lossless Ethernet environment
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FC Frame
FCS
EOF
FC Payload
CRC
FC
Header
FCoE
Header
FCoE Frame
Ethernet
Header
– Large maximum size of FC requires Ethernet Jumbo Frames
– No TCP, so Lossless environment required
– No IP routing
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FCoE Frame Formats
 Ethernet frames give a 1:1
encapsulation of FC frames
– No segmenting FC frames across
multiple Ethernet frames
– FCoE flow control is Ethernet based
FCoE Frame Format
Bit 0
Bit 31
Destination MAC Address
 BB Credit/R_RDY replaced by
Pause/PFC mechanism
Source MAC Address
 FC frames are large, require Jumbo
frames
IEEE 802.1Q Tag
ET = FCoE
– Max FC payload size is 2112 bytes
– Max FCoE frame size is 2180 bytes
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Reserved
Reserved
Reserved
Reserved
 Also created a FCoE Initialization
Protocol (FIP) for:
– Discovery
– Login
– To determine if the MAC address is
server provided (SPMA) or fabric
provided (FPMA)
Ver
SOF
Encapsulated FC Frame
(Including FC-CRC)
EOF
Reserved
FCS
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Lossless Ethernet
 Limit the environment only to the Data Center
– FCoE is Layer 2 only
 IEEE 802.1 Data Center Bridging (DCB) is the standards task group
 Converged Enhanced Ethernet (CEE) is an industry consensus term
which covers three link level features
– Priority Flow Control (PFC, IEEE 802.1Qbb)
– Enhanced Transmission Selection (ETS, IEEE 802.1Qaz)
– Data Center Bridging Exchange Notification (DCBX, currently part of IEEE
802.1Qaz, leverages 802.1AB (LLDP))
 Data Center Ethernet is a Cisco term for CEE plus additional
functionality including Congestion Notification (IEEE 802.1Qau)
Enhanced Ethernet provides the Lossless Infrastructure
which will enable FCoE and augment iSCSI storage traffic .
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21
PAUSE and Priority Flow Control
 PAUSE transforms Ethernet into a lossless fabric
 Classical 802.3x PAUSE is rarely implemented since it stops all traffic
 Priority Flow Control (PFC), formerly known as Per Priority PAUSE
(PPP) or Class Based Flow Control
– PFC will be limited to Data Center
 A new PAUSE function that can halt traffic according to priority tag while
allowing traffic at other priority levels to continue
– Creates lossless virtual lanes
 Per priority link level flow control
– Only affect traffic that needs it
– Ability to enable it per priority
– Not simply 8 x 802.3x PAUSE
Switch A
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Switch B
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Enhanced Transmission Selection and Data
Center Bridging Exchange Protocol (DCBX)
Enhanced Transmission Selection (ETS) provides a common
management framework for bandwidth management
 Allows configuration
of HPC & storage
traffic to have
appropriately higher
priority
 When a given load in
a class does not fully
utilize its allocated
bandwidth, ETS allows
other traffic classes to
use the available
bandwidth
 Maintain low latency
treatment of certain
traffic classes
Offered Traffic
3G/s
3G/s
2G/s
10 GE Link Realized Traffic Utilization
3G/s
HPC Traffic
2G/s
3G/s
3G/s
3G/s
3G/s
3G/s
3G/s
4G/s
6G/s
Storage Traffic
3G/s
3G/s
3G/s
LAN Traffic
5G/s
4G/s
t1
t2
t3
t1
t2
t3
Data Center Bridging Exchange Protocol (DCBX) is responsible for
configuration of link parameters for DCB functions
 Determines which devices support Enhanced Ethernet functions
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40 & 100 Gigabit Ethernet
 IEEE P802.3ba Task Force states that bandwidth
requirements for computing and networking applications are
growing at different rates, which necessitates two distinct
data rates, 40 Gb/s and 100 Gb/s
 IEEE target for standard completion of 40 GbE & 100 GbE is
2010
 40 GbE products shipping today supporting existing fiber
plant and plan is for 100 GbE to also support 10m copper,
100m MMF (use OM4 for extended reach) and SMF
 Cost of 40 GbE or 100 GbE is currently 5 – 10 x 10 GbE
– Adoption will become more economically attractive at 2.5x which will take a
couple of years
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Deployments - FCoE and iSCSI
FCoE
FC expertise / install base
iSCSI
Ethernet
No FC expertise needed
FC management
Layer 2 Ethernet
Leverage Ethernet/IP
expertise
Use FCIP for distance
10 Gigabit Ethernet
Supports distance
connectivity (L3 IP routing)
Strong virtualization affinity
Lossless Ethernet
Standards in process
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Standards since 2003
30
iSCSI Deployment
 iSCSI grew to > 10% of SAN market revenue
in 2008 *
 Many deployments are small environments,
which replace DAS
– Strong affinity in SMB/commercial markets
 Seeing strong growth of Unified Storage
– Supports iSCSI, FC, and NAS
 iSCSI with 10 Gigabit Ethernet becoming
available
Ethernet
iSCSI SAN
* According to IDC, 3/09
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31
FCoE Server Phase (Today)
 FCoE with direct attach of server to Converged Network
Switch at top of rack or end of row
 Tightly controlled solution
 Server 10 GE adapters may be CNA or NIC
Ethernet LAN
 Storage is still a separate network
Converged Network
Switch
FC Attach
1 Gb NICs
10 GbE CNAs
Fibre Channel SAN
FC HBAs
Storage
Ethernet
FC
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Rack Mounted
Servers
32
FCoE Network Phase (2009 / 2010)
 Converged Network Switches move out of the rack from a tightly
controlled environment into a unified network
 Maintains existing LAN and SAN management
Ethernet LAN
Overlapping domains may compel cultural adjustments
Ethernet Network
(IP, FCoE) and CNS
Converged Network
Switch
Fibre Channel SAN
FC Attach
10 GbE CNAs
Ethernet
FC
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Storage
Rack Mounted
Servers
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Convergence at 10 Gigabit Ethernet
 Two paths to a Converged Network
– iSCSI purely Ethernet
– FCoE allows for mix of FC and Ethernet (or all
Ethernet)
Ethernet LAN
 FC that you have today or buy tomorrow will plug
into this in the future
 Choose based on scalability, management, and
skill set
Converged Network
Switch
iSCSI/FCoE
Storage
10 GbE CNAs
FC SAN
Ethernet
FC
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Rack Mounted
Servers
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Time To Widespread Adoption
1980
1990
2000
2010
10 Gigabit Ethernet
Ethernet
73
Defined
83
Standard
93
Widespread
02
Standard
09?
Widespread
iSCSI
00 02
Defined
Standard
08
Widespread
Fibre Channel
85
Defined
94
Standard
03
Widespread
FCoE
07 09 ??
Defined
Standard?
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37
Summary
 A converged data center environment can be built using 10Gb Ethernet
– Ethernet Enhancements are required for FCoE and will assist iSCSI
 Choosing between FCoE and iSCSI will be based on customer existing
infrastructure and skill set
 10 Gigabit Ethernet solutions will take time to mature
– Active industry participation is creating standards that allow solutions that can
integrate into existing data centers
– FCoE and iSCSI will follow the Ethernet roadmap to 40 and 100 Gigabit in the future
The Converged Data Center allows Storage and
Networking to leverage operational and capital efficiencies
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38
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