Table Of Contents
Release Notes for Cisco SN 5428 Storage Router Release 2.2.1
April 30, 2002
Note You can find the most current documentation on Cisco.com. This set of electronic documents may contain updates and modifications made after the hard-copy documents were printed.
These release notes support Cisco SN 5428 Storage Router software release 2.2.1.
For a list of software caveats that apply to Release 2.2.1, see the "Open Caveats" section. The caveats are updated for every maintenance release and are located on Cisco.com and the Documentation CD-ROM.
These Release Notes describe the following topics:
The Cisco SN 5428 Storage Router provides universal access to storage over IP networks. The storage router software controls the operation of the Cisco SN 5428 Storage Router and provides the following services:
•SCSI Routing—provides IP hosts with access to Fibre Channel (FC) storage devices, using iSCSI protocol.
•VLAN Access Control—provides IP access control to storage based on a VLAN identifier (VID) number (in addition to access control through access lists)
•Authentication—provides iSCSI authentication using AAA authentication methods
•High Availability (HA)—provides the ability to group storage routers in a cluster for failover and other cluster-related functions
•SNMP/MIB support—provides network management of the SN 5428 through SNMP using selected MIBs
•A command-line interface (CLI) and a web-based GUI—provides user interfaces for configuration and maintenance of an SN 5428
Note The iSCSI protocol is an IETF-defined protocol for IP storage (ips). For more information about the iSCSI protocol, refer to the IETF standards for IP storage at http://www.ietf.org.
SCSI routing provides IP hosts with access to FC storage devices as if the storage devices were directly attached to the hosts, with access to devices being managed primarily in the SN 5428 Storage Router.
Figure 1 SCSI Routing Overview
An iSCSI target (also called logical target) is an arbitrary name for a group of physical storage devices. The iSCSI targets are created and mapped to physical storage devices attached to the SN 5428. The storage router presents the iSCSI targets to IP hosts (iSCSI initiators) as if the physical storage devices were directly attached to the hosts. (See Figure 1.) With SCSI routing, storage devices are not aware of each IP host; the storage devices are aware of the SN 5428 and respond to it as if it were one FC host.
This section describes the system requirements for Release 2.2.1 and includes the following information:
•The SN 5428 Storage Router's Gigabit Ethernet interfaces use a flow control mechanism for stopping and starting traffic that prevents the loss of data. Flow control should also be turned on at the router's Gigabit Ethernet interfaces where the SN 5428 Storage Router is connected.
•If the SN 5428 Storage Router is participating in a cluster, and the HA or management interfaces are plugged into a switch that has Spanning Tree Protocol (STP) enabled, the storage router should be considered as an end station and the affected ports on the switch should be configured appropriately. For example, set "portfast" on Cisco switches to cause the ports to immediately switch from blocking mode to forwarding mode. This helps prevent time-outs, which can cause unexpected behavior when storage routers join a cluster.
To ensure the best performance for the SN 5428 Storage Router and the iSCSI drivers, the extended windowing feature of TCP and the receive and transmit flow control feature of the Gigabit Ethernet driver should be enabled on all IP hosts connecting to the SN 5428. On the SN 5428 Storage Router, you can use the CLI show scsirouter all connection tcp command to display the current and maximum TCP window size for each connected host.
Graphical User Interface
The SN 5428's web-based GUI officially supports the following browsers:
Microsoft Internet Explorer version 5.5 with service pack 2, or later
Microsoft Windows NT 4.0, Microsoft Windows 2000
Netscape Navigator version 4.76
Netscape Navigator version 4.7
To access the online Help system for the GUI, the browser must also be enabled to support Java. This requirement applies only to the online Help system.
iSCSI Driver Version Support
A Cisco SN 5428 Storage Router running software release 2.2.1 or later is compatible with an IP host running any Cisco iSCSI Driver version 2.1.1 or later; it is not compatible with an IP host running any Cisco iSCSI Driver version 1.1.x.
Obtaining Updated Software and iSCSI Drivers
From time to time, Cisco releases updated versions of SN 5428 Storage Router software and iSCSI drivers. Updated versions of storage router software and the Cisco iSCSI drivers, accompanying readme files, release notes and example configuration file are available for download.
If you are a registered Cisco.com user, you can download SN 5428 Storage Router software and iSCSI drivers. If you are a non-registered Cisco.com user, you can download only iSCSI drivers.
You can access software by following these instructions:
Step 2 At the Software Center web page, under Software Products & Downloads, click Storage Networking Software.
Step 3 At the Storage Networking Software web page, click the appropriate link for your software.
Step 4 At the software download web page, click the file that you want to download. Another software download web page will be displayed. Follow the instructions on that and any subsequent web pages to download the software.
Step 5 To install and configure storage router software, see the appropriate storage router software configuration guide and release notes. To install and configure an iSCSI driver, see the readme file that accompanies the iSCSI driver (in the downloaded driver archive file) and the appropriate release notes.
Determining the SN 5428 Software Version
To determine the version of SN 5428 software running on the Cisco SN 5428 Storage Router, establish a Telnet or console port session with the storage router, and enter the CLI show version command. (See Example 1.)
Example 1 Determining the Software Version[SN5428-A01]$ show versionCISCO SN 5428 Storage RouterOperating System Software Ver: 2.2.1System Bootstrap Ver: 2.2.1Application Software Ver: 2.2.1CLI Version 2.1Copyright (c) 1986-2001 by Cisco Systems, Inc
The Application Software field displays the version of software currently running on the storage router. The System Bootstrap field displays the software version that will run the next time the storage router is restarted.
You can also check the version of the SN 5428 software by using the SN 5428 web-based GUI. Log in as Monitor to display the Processor and Software Information table, or click Processor and SW (under System) in the Monitor dynamic menu list in the left frame. The Software Version field contains the current software version information.
Limitations and Restrictions on SN 5428 Storage Router Clusters
This release includes the following restrictions on SN 5428 Storage Router clusters:
•A cluster can contain up to two SN 5428 Storage Routers.
•A cluster can contain up to 12 SCSI routing instances.
•A cluster can support up to 100 iSCSI targets.
The SN 5428 Gigabit Ethernet ports, GE 1 and GE 2, use MT-RJ small form-factor pluggable (SFP) modules (Cisco Product Number SN-SFP-GEMM-MTRJ). The availability of the MT-RJ SFP modules may be limited; if they are unavailable, you can use the LC SFP modules (Cisco Product Number SN-SFP-FCGEMM-LC) that are used in the SN 5428 Fibre Channel ports. You can mix MT-RJ and LC SFP modules in the Gigabit Ethernet ports. For example, you could have an MT-RJ SFP module in the GE 1 port and an LC SFP module in the GE 2 port. However, you must use only the LC SFP modules in the Fiber Channel ports.
This document lists caveats for Cisco SN 5428 Storage Router release 2.2.1. Caveats describe unexpected behavior or defects in SN 5428 software releases. Severity 1 caveats are the most serious caveats; severity 2 caveats are less serious.
This document describes open severity 1 and 2 caveats and selected caveats of other severities. For a more complete list of caveats against this release, access Cisco.com as described in the section "Cisco.com" at the end of this document.
Note If you have an account with Cisco.com, you can use Bug Navigator II to find caveats of any severity for any version. You can reach Bug Navigator II on Cisco.com at Service & Support:
Pressing the question mark (?) key after the facility keyword in the logging route add command does not display a list of valid facility names.
Workaround: Enter a valid facility name as described in the Cisco SN 5428 Storage Router Software Configuration Guide.
Selecting a logging destination of gui or smtp with the logging route add command fails to log messages to any destination.
Workaround: The gui and smtp logging destinations are not yet implemented. Select another destination, or select all destinations to route log messages to all valid destinations.
The vlan vid mtusize command allows an invalid MTU range of 1500 through 16114. If the MTU size is set to a value greater than 9000, an IP address associated with this VLAN cannot be added as a server interface to a SCSI routing instance.
Workaround: Do not set the MTU size greater than 9000 for a VLAN.
After the SN 5428 Storage Router is restarted, all levels of log messages are displayed on the serial console. A show logging command shows the console logging level set to notification, but all messages are logged to the serial console as if the console logging level was set to debugging. Management sessions via Telnet are correctly logging messages at the appropriate level; the problem only occurs on the serial console after the SN 5428 is restarted.
Workaround: Issue the logging console level command on the serial console to set the logging level as desired for that session.
The SN 5428 Storage Router does not interoperate with the Compaq MA8000 disk array.
A memory leak may occur when walking the CDP MIB. A bulk walk that traverses cdpVTPMgmtDomain has caused a leak of approximately 1.2KB.
Workaround: Avoid bulk walks of the CDP MIB.
On page 8-29 of the Cisco SN 5428 Storage Router Software Configuration Guide, the last paragraph should be expanded to include the location of the SN 5428 log, crash trace, savedconfig and script files, and should read as follows:
The SN 5428 Storage Router log files and crash trace files are stored in the /ata4/log directory. Saved configuration files are stored in the /ata3/savedconfig directory. Script files are stored in the /ata3/script directory.
To use FTP to retrieve the SN 5428 Storage Router log file, change to the /ata4/log directory using the FTP cd command. If necessary, specify the binary flag using the FTP binary command. Issue the FTP get command to retrieve the messages0 file and to copy it to the specified file on your server. When the process completes, close the FTP connection using the FTP bye command.
The following sections describe the related documentation available for Cisco SN 5428 Storage Router Release 2.2.1. These documents consist of hardware installation and software configuration guides, and platform-specific release notes, readme and example configuration files for the Cisco Storage Networking iSCSI drivers.
This Release Notes document is the only document specific to SN 5428 Release 2.2.1. It is only available as an electronic document on Cisco.com and the Documentation CD-ROM.
Platform-specific documents consist of the release notes, readme and example configuration files for Cisco Storage Networking iSCSI drivers, version 2.1.x. The files are currently available in electronic format only. See the "Obtaining Updated Software and iSCSI Drivers" section for details.
Refer to the Cisco SN 5428 Storage Router Hardware Installation Guide for hardware installation procedures. This document is available as a printed manual. It is also available as an electronic document on Cisco.com and the Documentation CD-ROM.
Refer to the Cisco SN 5428 Storage Router Software Configuration Guide Release 2.2, for configuration information and procedures. This document is available as a printed manual. It is also available as an electronic document on Cisco.com and the Documentation CD-ROM.
For documentation on the SN 5428 web-based GUI, refer to the SN 5428 Storage Router web-based GUI online Help system.
Service and Support
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For service and support for a product purchased directly from Cisco, use Cisco.com.
Software Configuration Tips on the Cisco TAC Home Page
A variety of Cisco SN 5428 Storage Router software installation, configuration and usage tips are available on the Cisco Technical Assistance Center (TAC) Web Site.
You can access "tech tips" by following these instructions:
Step 2 At the Cisco Routers web page, under Cisco SN 5428 Storage Router Software, click Product Support.
Step 3 At the Cisco SN 5428 Storage Router Product Support web page, click the appropriate links for additional information about installing and configuring storage router software.
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Cisco TAC Escalation Center
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This document is to be used in conjunction with the documents listed in the "Related Documentation" section.
Copyright © 2002, Cisco Systems, Inc.
All rights reserved.