HP Cisco MDS 8/12c Converged Networks and Fibre Channel over Ethernet
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HP Cisco MDS 8/12c manual content summary:
- HP Cisco MDS 8/12c | Converged Networks and Fibre Channel over Ethernet - Page 1
2 Converged networks 2 Data Center Bridging 3 Fibre Channel over Ethernet (FCoE) 3 Challenges for end-to-end network convergence 4 Servers 4 flow control 7 FCoE and DCB progress and challenges ahead 8 Using HP Flat SAN technology to enhance single hop FCoE 9 Evolution of - HP Cisco MDS 8/12c | Converged Networks and Fibre Channel over Ethernet - Page 2
and management overhead. Many data centers support three or more types of networks and therefore require unique switches, network adapters, and network management HP has successfully implemented converged Fibre Channel over Ethernet (FCoE) networks at the server edge using top-of-rack (ToR) switches - HP Cisco MDS 8/12c | Converged Networks and Fibre Channel over Ethernet - Page 3
path (CNAs, switches, and so on). QCN enabled networks work with PFC to avoid dropping packets and ensure a lossless environment. The DCB task group completed standards ratification in 2011. Fibre Channel over Ethernet (FCoE) FCoE is a protocol that wraps Fibre Channel frames in Ethernet frames for - HP Cisco MDS 8/12c | Converged Networks and Fibre Channel over Ethernet - Page 4
are connected. An FCF is typically an Ethernet switch with DCB, legacy Ethernet, and legacy Fibre Channel ports. Examples of FCFs include HP VC FlexFabric modules and HP Networking 5820X top-ofrack access switches with Fibre Channel option modules. FCoE has several advantages: • The CNA appears to - HP Cisco MDS 8/12c | Converged Networks and Fibre Channel over Ethernet - Page 5
servers. HP ProLiant BL G7 and Gen8 blade servers have embedded CNAs, called FlexFabric adapters, which eliminate some hardware costs associated with separate network fabrics. Dual-port, multifunction FlexFabric adapters are both Ethernet and host bus adapters, depending on user configuration. These - HP Cisco MDS 8/12c | Converged Networks and Fibre Channel over Ethernet - Page 6
security, other, SAN services Flow control (one hop) FCoE on DCB Fibre Channel switch software Per priority pause (PFC minimal) per priority buffer credit Manual tuning of workload InfiniBand is vendor support Convergence strategies As two of the largest data center infrastructure providers, HP and - HP Cisco MDS 8/12c | Converged Networks and Fibre Channel over Ethernet - Page 7
FECN/ BECN mechanism) Fibre Channel DCB Cisco's latest direction for FCoE over CEE Credit (BB Credit) Per priority pause flow control (PFC) Per priority pause flow control Severely limit number of hops, or tune configuration QCN FCF in each switch hop Same multi-hop limitations as FC SANs 7 - HP Cisco MDS 8/12c | Converged Networks and Fibre Channel over Ethernet - Page 8
buffer space, whether that is fixed assignment of space to ports and classes of service, or quotas for how much each of those can take from a shared pool. FIP snooping is a feature of the intermediate Ethernet switch in a two hop configuration. In simple terms, FIP snooping is part of an overall - HP Cisco MDS 8/12c | Converged Networks and Fibre Channel over Ethernet - Page 9
a fundamental shift away from the Ethernet model and toward the Fibre Channel model in which storage networks always use switches from a single vendor. • Every switch in the data center requires Fibre Channel switch firmware. The connections between those switches are Virtual Ethernet (VE) Ports. In - HP Cisco MDS 8/12c | Converged Networks and Fibre Channel over Ethernet - Page 10
core design. iSCSI over DCB offers many of the advantages of the FCoE/Fibre Channel combination. Using open source Internet iStorage Name Service Server (iSNS) instead of the higher priced Fibre Channel switch software from the major vendors will potentially keep costs much lower and eliminate the - HP Cisco MDS 8/12c | Converged Networks and Fibre Channel over Ethernet - Page 11
" that addresses some but not all of these issues. As a major vendor behind FCoE, Cisco is driving efforts for a data center switch refresh. The aim is to replace aging technology with their new generation switches, using FCoE requirements as the reason to act. A year ago, Cisco changed plans from - HP Cisco MDS 8/12c | Converged Networks and Fibre Channel over Ethernet - Page 12
over Ethernet and Data Center Bridging technology brief HP Virtual Connect Direct-Attach Fibre Channel for HP 3PAR Storage Systems solutions brief HP FlexFabric Networks web portal OpenFlow - Software-Defined Network Web address http://h20000.www2.hp.com/bc/docs/support/SupportManual/c03094466
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Technical white paper
Converged Networks and Fibre Channel over
Ethernet
Table of contents
Abstract
2
Introduction
2
Converged networks
2
Data Center Bridging
3
Fibre Channel over Ethernet (FCoE)
3
Challenges for end-to-end network
convergence
4
Servers
4
Direct-attach storage
5
Storage Area Network
5
iSCSI: SANs using TCP/IP networks
5
Cluster interconnects
5
Approaches to converged data center
networks
5
Convergence strategies
6
Cost structure
7
Congestion and flow control
7
FCoE and DCB progress and challenges
ahead
8
Using HP Flat SAN technology to
enhance single hop FCoE
9
Evolution of storage
10
Conclusion
11
For more information
12