ocean space sns series fc switch technical white paper v1

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Oceanspace SNS Series FC

Switch Technical White Paper

Revision V1.0

Release Date 2010-09-26

Huawei Symantec Technologies Co., Ltd.



Revision 01 (2010-06-30) °æÈ¨ËùÓÐ © ³É¶¼ÊÐ»ªÎª´æ´¢ÍøÂç°²È«ÓÐÏÞ¹«Ë¾Copyright © Huawei Symantec Technologies Co., Ltd.

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Copyright © Huawei Symantec Technologies Co., Ltd. 2009. All rights reserved.

No part of this document may be reproduced or transmitted in any form or by any means without priorwritten consent of Huawei Symantec Technologies Co., Ltd.

Trademarks and Permissions

and other Huawei Symantec trademarks are trademarks of Huawei Symantec Technologies Co., Ltd.

All other trademarks and trade names mentioned in this document are the property of their respectiveholders.

Notice

The purchased products, services and features are stipulated by the commercial contract made betweenHuawei Symantec and the customer. All or partial products, services and features described in thisdocument may not be within the purchased scope or the usage scope. Unless otherwise agreed by thecontract, all statements, information, and recommendations in this document are provided “AS IS” withoutwarranties, guarantees or representations of any kind, either express or implied.

The information in this document is subject to change without notice. Every effort has been made in the

preparation of this document to ensure accuracy of the contents, but all statements, information, andrecommendations in this document do not constitute the warranty of any kind, express or implied.

Huawei Symantec Technologies Co., Ltd.

Address: Building 1

The West Zone Science Park of UESTC, No.88, Tianchen Road

Chengdu, 611731

P.R.China

Website: http://www.huaweisymantec.com

Email: [email protected]



Oceanspace SNS Series FC Switch Technical White Paper SECRET


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Revision History

Date Revision Description Prepared by

2010-09-26 V1.0 Initial Commercial Release Zhoulei





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Contents

1 Introduction .............................................................................................................................. 5 2 Solutions .................................................................................................................................... 6

2.1 Stacking ............................................................................................................................................................ 6 2.2 Trunking ........................................................................................................................................................... 7 2.3 I/O StreamGuard .............................................................................................................................................. 8 2.4 Credit Buffers ................................................................................................................................................... 9 2.5 mPort .............................................................................................................................................................. 10

3 Experience ............................................................................................................................... 11 3.1 Management Software.................................................................................................................................... 11 3.2 Fabric Security ............................................................................................................................................... 12 3.3 Interoperability ............................................................................................................................................... 12 3.4 Low Total Cost of Ownership ........................................................................................................................ 13

4 Acronyms and Abbreviations ............................................................................................... 14





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1 Introduction

The Oceanspace SNS series FC switches are the Huawei Symantec Technologies Co. Ltd.(hereinafter referred to as Huawei Symantec) products. The original supplier is Qlogic. TheSNS series has two models: SNS2120 and SNS5120.

The SNS series FC switches are compatible with FC-SW-2 compliant switches includingBrocade® and Cisco®. By configuring various scalable solutions, the SNS series offers smalland medium-sized businesses (SMBs) the best choice to cost-effectively meet therequirements for easy-to-use and integrated heterogeneous open SAN.

The SNS series FC switches are most applicable to SMB customers for simplifyinginfrastructure and improve business continuity.





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2 Solutions

2.1 Stacking

The SNS series supports a stacking of up to six FC switches through the stacking ports,

providing a stable and high-expandable transport for aggregate inter-switch link (ISL) traffic.Stacking cuts the complexity and costs, and eliminates the disruption, port waste andmanagement hassles associated with using device ports as ISLs. Figure 2-1 and Figure 2-2show the stacking ports of the SNS2120 and SNS5120 in the red frame respectively.

Figure 2-1 Front view of the Oceanspace SNS2120

Figure 2-2 Front view of the Oceanspace SNS5120





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1. Each SNS FC switch ships with all four 10 Gbps stacking ports active by default.Customers no longer need to take ISL port costs into account when planning their SANs— every port they purchase may now be connected directly to a server or storage device.

2. When 10 Gbps stacking ports cannot meet the business requirements, customers maynon-disruptively upgrade the four ports to 20 Gbps by using a license.

The SNS series FC switch is stackable through the 10 Gbps or 20 Gbps stacking ports. Thetopologies include cascade, cascade loop, mesh, and core edge, depending on the number of stacked switches. Figure 2-3 shows the stacking topologies of the SNS2120.

Figure 2-3 Stacking topologies of the Oceanspace SNS2120

2.2 Trunking

The SNS series FC switches offer trunking without extra cost, ensuring a high-reliability andhigh-transportability interconnection between switches.

1. Load balancing and fault tolerance functionalities: Trunking dynamically balances thetraffic on various ports of switches and servers. When a port becomes faulty, it isautomatically removed from the trunked port group, and the traffic is reallocated amongthe other trunked ports, thus realizing fault tolerance.

2. Switch-on-exchange design of trunking supports intelligent path selection. As shown inFigure 2-4, there is a 4 Gbps trunking path and a 10 Gbps trunking path between theswitches. Data transfer is automatically switched to the 10 Gbps trunking path. Theswitch is triggered by two factors: rate and number of hops.





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Figure 2-4 Automatic trunking switch

2.3 I/O StreamGuard

The unique I/O StreamGuard technology suppresses registered state change notifications(RSCNs), guaranteeing the traffic continuity.

In a SAN, the fabric controller broadcasts RSCNs to all devices in the fabric to make sure that

they have learnt the latest updates.

Figure 2-5 Principle of RSCN

Some applications are very sensitive to RSCNs, such as video-on-demand (VOD) and storagebackup. The applications of RSCNs may result in service interruption. I/O StreamGuardtechnology can suppress RSCNs to the minimum, thus guaranteeing the business continuity.Figure 2-6 shows the difference before and after the I/O StreamGuard technology is applied.





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Figure 2-6 Technical data before and after I/O StreamGuard is applied

2.4 Credit Buffers

To support long distance FC transmission, the FC ports must have buffer-to-buffer credits (BBcredits).

A buffer credit allows the transmitter to send a frame. The transmitter sends another frameonly after the previous frame arrives at the destination. However, when the transmission

distance is too long or the latency is too high, the available bandwidth becomes limitedbecause the time spent on waiting for acknowledgment from the destination is extended.Therefore, offering a large amount of buffer credits at the transmitter end is the key tosustaining long distance FC transmission. The transmitter can fill frames in the channel duringthe wait time.

A rule-of-thumb requires a buffer credit every 2 km to maintain performance.

Each SNS FC switch port has 16 credit buffers. You can supply the port used for long distancetransmission with the credit buffers on another port, as shown in Figure 2-7.





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Figure 2-7 Extending distance with more credit buffers

2.5 mPort

The SNS series FC switches provide the mPort function which can move the license for the

active port to the inactive port, to guarantee application flexibility and low total cost of ownership (TCO). If an active port becomes faulty, the license can be used to activate theother ports, as shown in Figure 2-8.

Figure 2-8 mPort function

: Inactive

: Active and connected

: Active and disconnected





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3 Experience

3.1 Management Software

You can run the following management software on any of the SNS series FC switches to

manage the entire fabric.1. Web-based QuickTools: an embedded Java web applet that provides the basic functions

including device discovery, device management, zoning, and fabric management. SeeFigure 3-1.

Figure 3-1 QuickTools management interface

2. Enterprise Fabric Suite: enterprise-class software that integrates advanced functionsincluding fabric tracker, performance monitoring, port threshold alarm configuration,stack management. See Figure 3-2.





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Figure 3-2 Enterprise Fabric Suite management interface

3. CLI: The command line interface (CLI) management method is also applicable to thefabric.

3.2 Fabric Security

The SNS series FC switches offer the right mix of protection features for user security,connection security, and device security, including:

RADIUS authentication

Secure Shell (SSH)

Secure Socket Layer (SSL)

Fibre Channel-Security Protocol (FC-SP), DH-CHAP, and FC-GS-4 CT

3.3 Interoperability

The SNS series FC switches feature high interoperability in the following aspects:

Fully interoperable with all SNS series switch products

Compatible with FC-SW-2 compliant switches

Compatible with storage arrays and servers of mainstream vendors

Support for SNMP, API, and SMI-S agent, easy for integrating third-party applications





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3.4 Low Total Cost of Ownership

The SNS series FC switches bring decreased total cost of ownership (TCO) through thefollowing ways:

Ensure that the fabric does not occupy your service ports with four activated 10 Gbps

stacking ports. Enable flexible and effective utilization of ports with the mPort function.

Guarantee smooth expansion by upgrading four 10 Gbps stacking ports to 20 Gbps withone license.

Minimize management costs with easy-to-use and comprehensive CLI, QuickToolsembedded web interface, and Enterprise Fabric Suite 2007 software tools included withevery SNS series switch.





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4 Acronyms and Abbreviations

Table 4-1 Acronyms and abbreviations

Acronym andAbbreviation

Definition

Active Firmware The firmware image on the switch that is in use

Active Zone Set The zone set that defines the current zoning for the fabric

Activity LED A port LED that indicates when frames are entering or leaving theport

Administrative State State that determines the operating state of the port, I/O blade, orswitch. The configured administrative state is stored in the switchconfiguration. The configured administrative state can betemporarily overridden using the command line interface

AL_PA Arbitrated Loop Physical Address. A unique one-byte valueassigned during loop initialization to each NL_Port on a loop

Alarm A message generated by the switch that specifically requestsattention. Alarms are generated by several switch processes. Somealarms can be configured.

Alias A named set of ports or devices. An alias is not a zone, and cannothave a zone or another alias as a member.

Arbitrated Loop A Fibre Channel topology where ports use arbitration to establish apoint-to-point circuit

Arbitrated LoopPhysical Address(AL_PA)

A unique one-byte value assigned during loop initialization to eachNL_Port on a loop

ASIC Application Specific Integrated Circuit. A chip designed for aspecific applications, such as a transmission protocol or a computer

Auto Save Zoning parameter that determines whether changes to the activezone set that a switch receives from other switches in the fabric willbe saved to permanent memory on that switch

BootP A type of network server





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Definition

Buffer Credit In buffer-credit flow control, the source and destination set thenumber of unacknowledged frames (buffer credits) allowed toaccumulate before the source stops sending data.

Cascade A serial connection

Cascade Topology A fabric in which the switches are connected in series. If youconnect the last switch back to the first switch, you create acascade-with-a-loop topology

Class 2 Service A service which multiplexes frames at frame boundaries to or fromone or more N_Ports with acknowledgment provided

Class 3 Service A service which multiplexes frames at frame boundaries to or fromone or more N_Ports without acknowledgment

CLI Command Line Interface

Configured Zone Sets The zone sets stored on a switch excluding the active zone set

Default Visibility Zoning parameter that determines the level of communicationamong ports/devices when there is no active zone set

Domain ID User defined number that identifies the switch in the fabric

E_Port Expansion Port

Event Log Log of messages describing events that occur in the fabric

F_Port Fabric Port

Fabric Database The set of fabrics that have been opened during a QuickToolssession

Fabric ManagementSwitch

The switch through which the fabric is managed

Fabric Name User defined name associated with the file that contains user listdata for the fabric

Fabric View File A file containing a set of fabrics that were opened and saved duringa previous QuickTools session

Failover Automatically switching control from one CPU to another due toan error condition

FDMI Fabric Device Management Interface

FL_Port Fabric Loop Port

Flash Memory Memory on the switch that contains the chassis control firmware

Frame Data unit consisting of a start-of-frame (SOF) delimiter, header,data payload, CRC, and an end-of-frame (EOF) delimiter

FRU Field Replaceable Unit





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Definition

FT feature Fault Tolerant feature, which implement the fail-over featurebetween two CPU blade in one SNS5120

G_Port Generic Port

GL_Port Generic Loop Port

GUI Graphical User Interface

Hard Zone Hard zoning divides the fabric for purposes of controllingdiscovery and inbound traffic

Heartbeat LED A chassis LED that indicates the status of the internal switchprocessor and the results of the Power-On Self-Test

Hop A measure of fabric latency represented by the ISL that any framecrosses when travelling from one switch to another. A frame thattravels from one switch to another over an ISL

HyperStack A method of connect 2 or more SNS5120s instead of traditionalISL

Inactive Firmware The firmware image on the switch that is not in use

In-band Management The ability to manage a switch through another switch over aninter-switch link

Initiator The device that initiates a data exchange with a target device

In-Order-Delivery A feature that requires that frames be received in the same order inwhich they were sent

Input Power LED A chassis LED that indicates that the switch logic circuitry isreceiving proper DC voltages

Inter-Switch Link The connection between two switches using E_Ports

LIP Loop Initialization Primitive sequence

Logged-in LED A port LED that indicates device login or loop initialization status

Maintenance Button Formerly known as the Force PROM button. Momentary button onthe switch used to reset the switch or place the switch inmaintenance mode

Maintenance Mode Formerly known as force PROM mode. Maintenance mode sets theIP address to 10.0.0.1 and provides access to the switch formaintenance purposes

ManagementInformation Base

A set of guidelines and definitions for SNMP functions

ManagementWorkstation

PC workstation that manages the fabric through the fabricmanagement switch





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Definition

Mesh Topology A fabric in which each chassis has at least one port directlyconnected to each other chassis in the fabric

Multistage Topology A fabric in which two or more edge switches connect to one ormore core switches

N_Port Node Port

NL_Port Node Loop Port

NPIV N_Port ID virtualization

Orphan Zone Set Zones that are currently not in a zone set are considered to be partof the orphan zone set. The orphan zone set is not an actual zoneset, but rather a way of displaying the zones that are not currently ina zone set.

Pending Firmware The firmware image that will be activated upon the next switch

reset

Port Binding An authorization method that defines a list of device WWNs thatcan login to a switch port.

POST Power-On Self Test Diagnostics

Principal Switch The switch in the fabric that manages domain ID assignments

RSCN Registered State Change Notification

SFP Small Form-Factor Pluggable

SNMP Simple Network Management Protocol, an application protocolthat manages and monitors network communications and functions

Soft Zone Soft zoning divides the fabric for purposes of controllingdiscovery. Members of the same soft zone automatically discoverand communicate freely with all other members of the same zone

Stack A method of connect 2 or more SNS2120s instead of traditionalISL

Switchover Manually switching control from one CPU to another

Target A storage device that responds to an initiator device

trunk A batch of port which can be transmit concurrently

WWN Worldwide Name, a unique 64-bit address assigned to a device by

the device manufacturer

Zone A set of ports or devices grouped together to control the exchangeof information

Zone set A set of multi zones

Zoning Database The set of zone sets, zones, and aliases stored on a switch

ocean space sns series fc switch technical white paper v1

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