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Table Of Contents
Release Notes for Cisco SN 5420 Storage Router Release 1.1.7
Obtaining Updated Software and iSCSI Drivers
Determining the Storage Router Software Version
Upgrading to a New Software Release
Limitations and Restrictions on SN 5420 Storage Router Clusters
Obtaining Technical Assistance
Release Notes for Cisco SN 5420 Storage Router Release 1.1.7
December 7, 2001
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 5420 Storage Router Release 1.1.7. The SN 5420 Release 1.1.7 supersedes SN 5420 Release 1.1.5; there is no Cisco SN 5420 Storage Router Release 1.1.6.
For a list of software caveats that apply to Release 1.1.7, see the "Caveats" section. The caveats are updated for every maintenance release and are located on Cisco.com and the Documentation CD-ROM.
Contents
These Release Notes describe the following topics:
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Introduction
The SN 5420 Storage Router provides servers with IP access to storage through SCSI routing using iSCSI protocol. The iSCSI protocol is a protocol for encapsulating SCSI requests and responses over IP. With SCSI routing, servers use an IP network to access storage as if the servers were directly attached to the storage devices. (See Figure 1.)
Figure 1 SN 5420 Storage Router Overview
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System Requirements
This section describes the system requirements for Release 1.1.7 and includes the following information:
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Obtaining Updated Software and iSCSI Drivers
From time to time, Cisco releases updated versions of storage router software and iSCSI drivers. Servers accessing the SN 5420 Storage Router must have a Cisco Storage Networking iSCSI driver installed and configured. Updated versions of storage router software and the Cisco Storage Networking iSCSI drivers, accompanying readme files, release notes and example configuration files are available for download.
If you are a registered Cisco.com user, you can download 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 1
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http://www.cisco.com/pcgi-bin/tablebuild.pl/sn5420
(You will be prompted to enter your user name and password.)•
http://www.cisco.com/pcgi-bin/tablebuild.pl/sn5420
Step 2
Step 3
In addition, you can check these websites for information about the availability of new drivers, updated storage router software and drivers, driver compatibility, and other relevant information.
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External Devices
The SN 5420 Storage Router Gigabit Ethernet interface uses a flow control mechanism for stopping and starting traffic that prevents the loss of data. Flow control should also be turned on at the Gigabit Ethernet port that the SN 5420 Storage Router is plugged in to.
External Hosts
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Graphical User Interface
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This browser restriction applies only to the Download Software feature (available from the Maintenance function) and only when accessing the GUI with a browser running on the Microsoft Windows platform. There are no browser limitations or requirements associated with other features and functions of the SN 5420 web-based GUI.
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Determining the Storage Router Software Version
To determine the version of SN 5420 software running on the Cisco SN 5420 Storage Router, establish a Telnet or console port session with the storage router, and change to Administrator mode. Then enter the CLI show software command. (See Example 1.)
Example 1 Determining the Software Version
[SN5420-A01]# show softwareVersion Boot Hash Sign Crash Size Date1.1.5 OK OK N/A 0 7.01 MB Aug 2 13:33 CST 20011.1.7 OK OK N/A 0 7.40 MB Nov 29 12:07 CST 2001Disk Space Free: 10.5 MbytesDownload URL: http://10.1.11.32/~software/sn5420Download User: SWAdmin01Running Version: 1.1.7Will boot Version: 1.1.7The last entries in the table of information displayed in response to the command show the running version (Running Version) and the version that the storage router will run at the next reboot (Will boot Version).
You can also check the version of the SN 5420 software by using the SN 5420 web-based GUI. At the web-based GUI Monitor page, click Processor and SW under the System menu. Clicking Processor and SW causes the Processor and Software Information table to be displayed. The Software Version field contains the current software version information.
Upgrading to a New Software Release
For information about upgrading to new SN 5420 software using the CLI, see the section "Installing Updated Software" in Chapter 6, "Maintaining and Managing the SN 5420" of the Cisco SN 5420 Storage Router Software Configuration Guide.
To upgrade to new SN 5420 software using the SN 5420 web-based GUI, follow these instructions.
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Step 5
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Step 7
For information about upgrading to new iSCSI driver software, see the readme file for the appropriate iSCSI driver.
Uninstalling an Upgrade
To return to a previous SN 5420 software release and remove the updated SN 5420 software using the CLI, follow these instructions:
To return to a previous SN 5420 software release and remove the updated SN 5420 software using the SN 5420 web-based GUI, follow these instructions:
Step 1
Step 2
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Step 6
For information about uninstalling updated iSCSI driver software, see the readme file for the appropriate iSCSI driver.
New and Changed Information
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Limitations and Restrictions on SN 5420 Storage Router Clusters
For this release, there are no new limitations or restrictions on SN 5420 Storage Router clusters. The limitations and restrictions associated with SN 5420 release 1.1.3 still apply, as follows:
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Caveats
Caveats describe unexpected behavior or defects in SN 5420 software releases. Severity 1 caveats are the most serious caveats; severity 2 caveats are less serious.
This document describes open and resolved severity 1 and 2 caveats and selected caveats of other severities:
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Within the sections the caveats are sorted alphanumerically by caveat number.
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http://www.cisco.com/pcgi-bin/Support/Bugtool/launch_bugtool.pl.
Open Caveats
There are no severity 1 or 2 caveats open against SN 5420 Release 1.1.7. 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.
Resolved Caveats
All the caveats listed in this section are resolved in SN 5420 Release 1.1.7. This section describes severity 1 and 2 caveats and selected caveats of other severity levels.
CLI
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A SCSI routing service instance supports two types of storage mapping: target-and-LUN mapping or target-only mapping. The CLI prevents the user from using the same LUN number twice in a target configuration when only target-and-LUN mapping entries are being made. If a user attempts to mix mapping methods, however, a LUN may be mapped twice because the CLI fails to check for the case where a target-and-LUN mapping entry is added to a target previously configured with target-only mapping. This type of conflict might occur if a user is changing from a target-only mapping configuration to a target-and-LUN mapping configuration, but has not yet completed all changes. The CLI logs a critical error, and the SCSI routing service is not operational.
Workaround: Reboot the storage router without saving the configuration changes, or delete one of the devices from the target that resulted in duplicate LUN mapping. If you intend to change from target-only mapping to target-and-LUN mapping, delete the device added via target-only mapping first to avoid the critical error.
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The SN 5420 Storage Router management interfaces may hang if a script is used to rapidly issue a large number of CLI commands without waiting for a definite response from each command. The management interfaces hang because the storage router runs out of management interface buffers. If data is running through the storage router at the time, it will continue to run.
Workaround: Do not send commands to the CLI via a script. Avoid sending a large number of CLI commands in a rapid sequence to the storage router.
Fibre Channel
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Moving the SN 5420 Storage Router Fibre Channel connection or the device connections between Fibre Channel hubs and Fibre Channel switches without rebooting the storage router may cause the show devices command to incorrectly display a Fibre Channel Loop device as a Fibre Channel-attached device, or vice versa.
Workaround: Only the display is incorrect. The devices are still available to the iSCSI servers. To correct the display, reboot the storage router.
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A Compaq RA4100 RAID controller, connected to the SN 5420 Storage Router with a hub, is not listed in the displayed list of devices resulting from the show devices CLI command.
Workaround: None.
Gigabit Ethernet
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If the Gigabit Ethernet interface goes down while SCSI routing service instances are being failed over, there is a very intermittent chance that all SCSI routing service instances will not be failed over appropriately. One or more SCSI routing service instances may be stuck in a terminating state.
Workaround: The SCSI routing service instance will terminate properly when the Gigabit Ethernet interface comes back up. If necessary, reboot the storage router that contains the terminating SCSI routing service instance.
High Availability (HA)
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After adding a new node to an active cluster using the "delete configuration" option, existing access lists on the other node may be overwritten by the blank access lists of the new node.
Workaround: Save all configuration information to a named configuration file on the active node before adding a new node to the cluster. If access lists are deleted when the new node is added, restore them from the saved configuration file. All SCSI routing service instances will also need to be restored, because the access list associated with each target has been changed to none.
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A condition such as the removal and immediate replacement of a Fibre Channel or Gigabit Ethernet cable may cause storage router nodes in a cluster to lock in conflict over ownership of a SCSI routing service instance.
Workaround: Reboot one of the nodes that is in conflict. The other node will begin running the SCSI routing service instance.
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The SN 5420 Storage Router may reboot unexpectedly with a "memPartAlloc" error on the console during the execution of a set cluster command using the merge option.
Workaround: When possible, use the delete option, rather than the merge option. If this is not possible, stop all SCSI routing service instances on the storage router that is joining the cluster before executing the set cluster command. If the problem still occurs, stop all SCSI routing service instances on all storage routers already in the cluster, stop all SCSI routing service instances on the storage router joining the cluster, and then execute the set cluster command. After the storage router reboots, start all SCSI routing service instances on the appropriate storage routers in the cluster.
iSCSI Server
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If a condition occurs that causes an iSCSI initiator to drop and reestablish a session to the SN 5420 Storage Router that is actively writing data to a device, it is possible that incorrect data could be written to the device. The new session is added to the storage router before the old session has been completely dropped, allowing stale data packets to arrive on the old session and then be retransmitted on the new session by the iSCSI host. This may be caused by temporarily removing the Gigabit Ethernet cable from the storage router, rebooting the first storage router in a cluster, or certain network interruptions that cause the host to temporarily drop communications with the storage router.
Workaround: Stop traffic on the Gigabit Ethernet interface before failing over a SCSI routing service instance, pulling cables, or rebooting the first storage router in a cluster.
SCSI
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A Windows NT backup will fail if a status command (mt -f /dev/rmt/xx status) is issued to the same tape target from a Solaris host.
Workaround: Create an access list that allows only the desired server access to the tape device. While the Windows NT backup is in progress, do not issue any status commands to the active tape device from any other host.
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TCP/IP
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When adding a new host route to the SN 5420 Storage Router routing table, routes may be unavailable to the show net route command until the storage router is rebooted.
Workaround: Reboot the storage router to make the new route available.
Documentation Updates
This section describes changes to the Cisco SN 5420 Storage Router documentation set.
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On pages vii, 1-1 and 1-10 of the Cisco SN 5420 Storage Router Software Configuration Guide, and page 1-1 of the Cisco SN 5420 Storage Router Hardware Installation Guide, there are references to a Cisco Storage Networking iSCSI Drivers CD. The iSCSI drivers, readme and example configuration files referenced there are currently available only through the Cisco.com website. The Cisco SN 5420 Storage Router does not currently ship with a Cisco Storage Networking iSCSI Drivers CD.
See the "Obtaining Updated Software and iSCSI Drivers" section for details on obtaining iSCSI drivers.
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On page B-2 of the Cisco SN 5420 Storage Router Hardware Installation Guide, Table, B-2, "Fibre Channel Port Cabling Specifications," the values in the Maximum Cable Distance column should be changed as follows:
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On page 7-6 of the Cisco SN 5420 Storage Router Software Configuration Guide, an interface keyword should be added to the add route gw command. This optional keyword allows a route to be associated with a specific interface, for example, the Gigabit Ethernet interface. If the interface is not specified, the storage router will try to determine the interface on its own by checking already existing routes and interface addresses. This command was enhanced to resolve caveat CSCdu24643.
If a route is added for an interface that is not yet configured with an IP address, a message displays indicating that the specified gateway is currently unreachable by the named interface, but the route will be added when the named interface is configured with a suitable IP address. To display the route before it is added to the routing table, use the new show route command.
The new add route gw command syntax is:
add route {A.B.C.D/bits | A.B.C.D/1.2.3.4 | default} gw E.F.G.H [interface ifname]
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On pages 7-11 and 7-15 of the Cisco SN 5420 Storage Router Software Configuration Guide, the following sentences should be added to the end of the first paragraph in the "Usage Guidelines" section. On page 7-21, the sentences should be inserted into the "Usage Guidelines" section between the forth and fifth paragraphs.
Mapping to a loop ID assumes a compatible device interface topology, such as loop. If an incompatible device interface topology, such as point-to-point (PTP), is detected, a warning message is displayed (although the requested mapping action is still processed by the storage router).
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The functionality of the delete scsirouter target command has been enhanced. Any attempt to delete a target or LUN that is currently logged into by an iSCSI driver will result in an informational message indicating that the object is in use and will not be deleted.
On page 7-32 of the Cisco SN 5420 Storage Router Software Configuration Guide, an optional force keyword should be added to the delete scsirouter target command. The force keyword allows the deletion of a target or LUN that is in use by an iSCSI driver, overriding the default protections.
Use the force keyword with caution. Deleting a target or LUN that is being actively used by an iSCSI driver can cause unexpected results.
The new command syntax is:
delete scsirouter name target {name | all} [lun nn] [force]
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To eliminate potential space problems when downloading updated software, the download process will now fail if more than one version of software is detected on the storage router.
On pages 6-3 of the Cisco SN 5420 Storage Router Software Configuration Guide, the following sentences should be added to the end of the first paragraph in the "Make Updated Software Available to the SN 5420" section. On page 7-39, these sentences should be inserted into the "Usage Guidelines" section as the second paragraph.
You can store two versions of software on the storage router. Before attempting to install updated software, verify that only a single version of software exists on the storage router. If necessary, delete any software except the current running version.
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The download software readme command has been removed. The Release Notes document for each software release is only available as an electronic document on Cisco.com and the Documentation CD-ROM.
All references to the download software readme command should be removed from the Cisco SN 5420 Storage Router Software Configuration Guide.
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On page 7-40, 7-41, and 7-42 of the Cisco SN 5420 Storage Router Software Configuration Guide, the description of failover functionality on a stand-alone system should be changed to read as follows:
If no eligible storage router is found, the SCSI routing service will start running again on the same storage router. If the SN 5420 is configured as a stand-alone system, failover is not allowed.
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On page 2-4 of the Cisco SN 5420 Storage Router Software Configuration Guide, the steps in the section "Entering the Management Interface IP Address" should be changed as follows:
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The set ha configuration command is a new command, added as part of the resolution to caveat CSCdt56378. To specify the configuration mode for the storage router, or to manually switch between modes, use the set ha configuration command. This is an Administrator-mode command.
set ha configuration {standalone | clustered}
Use the standalone keyword to configure a storage router that will not participate in a storage router cluster. A stand-alone storage router does not require the management or HA interfaces to be available in order to complete the SN 5420 configuration. The MGMT and HA ports do not need to be cabled.
Use the clustered keyword to configure a storage router that will participate in a storage router cluster. A clustered storage router requires the management and HA interfaces to be available in order to complete the SN 5420 configuration. The MGMT and HA ports must be correctly cabled.
Use the save system or save all CLI command to save the setting.
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The set scsirouter reserveproxy command is a new command, added as part of the resolution to caveat CSCdu85322. To configure a Reserve / Release proxy on the specified SCSI routing services instance and to specify whether the SCSI reserve and release commands are forwarded to the target, use the set scsirouter reserveproxy command. This is an Administrator-mode command.
set scsirouter name reserveproxy {enable | disable} [passthru {yes | no}
The SCSI Reserve / Release command allows an initiator to reserve the storage device for its own use. Attempts to access the storage device from other initiators are rejected until the first initiator releases the storage device. If this feature is enabled, the storage router keeps track of the reserved status of target LUNs and returns the appropriate SCSI command status to other initiators that issue SCSI commands to that target LUN. If passthru is set to yes, the reserve is sent to the target.
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The Reserve / Release proxy feature is disabled by default.
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The functionality and output of the set software version command have been enhanced to include verification of software, confirmation of required disk space, and status at each step in the process.
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On page 7-131 of the Cisco SN 5420 Storage Router Software Configuration Guide, the "Usage Guidelines" section should be updated to read as follows:
Use this command to display the WWNN, WWPN, LUN number, vendor, product name and serial number for all devices found on the SN 5420 Fibre Channel network. For loop-attached devices, loop ID information is also displayed. For fabric-attached devices, the 24-bit port ID is displayed. The output indicates the type of topology on which the devices are detected as private/public loop or fabric attached.
The following "Examples" section should be added.
The following is an example of output for the show devices command when the device interface topology is set to PTP:
[SN5420A]# show devicesPrivate/Public Loop Devices detected:lunwwn:wwpn:loopid:lun:vendor:product:serialNONEFabric Attached Devices detected:lunwwn: wwpn: portId: lun: vendor: product: serial3000102037f9bf2a 3100003078b9bf2a 0x411ea 0 SEAGATE ST31951FD 4DZA4MZB0124000402037e9c036 4100004056b9c036 0x4113c 0 SEAGATE ST31951FD 3CXO4M4T0155003002037d9c01e 5100002088b9c01e 0x511f0 0 SEAGATE ST31951FD 3CPQ4MN07156000082037c9bf7c 6100001137b9bf7c 0x511f1 0 SEAGATE ST31951FD 3CZZ46H7005The following is an example of output for the show devices command when the device interface topology is set to loop:
[SN5420A]# show devicesPrivate/Public Loop Devices detected:lunwwn: wwpn: loopid: lun: vendor: product: serial3000102037b7847d 3100002037b7847d 1 0x0 SEAGATE ST31951FD 3CC030071102008002047z78e44 2100002047z78e44 2 0x0 SEAGATE ST31951FD 3C3A830010C9000002038c59748 2100002038c59748 3 0x0 SEAGATE ST31951FD 3CCPNT007112000002067c51e08 2100002067c51e08 4 0x0 SEAGATE ST31951FD 3CV2X000711Fabric Attached Devices detected:lunwwn:wwpn:portId:lun:vendor:product:serialNONE•
On page 7-138 of the Cisco SN 5420 Storage Router Software Configuration Guide, the description for the match string syntax should be updated as follows:
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The second bullet in the "Usage Guideline" section should be updated as follows:
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The show route command is a new command, added as part of the resolution to caveat CSCdu24643. To display all routes that have been configured, including those that have not been added to the routing table because the associated interface is not yet configured, use the show route command. This is an Administrator-mode command.
show route
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The output of the verify software version command has been enhanced to display additional information. On page 7-69 of the Cisco SN 5420 Storage Router Software Configuration Guide, the "Usage Guidelines" section should be updated to read as follows:
Use this command after downloading software to verify that the download completed successfully and that the download software is bootable. The output includes the name, size and status for each module in the SN 5420 Storage Router software.
Related Documentation
The following sections describe the related documentation available for Cisco SN 5420 Storage Router Release 1.1.7. 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.
Release-Specific Documents
This Release Notes document is the only document specific to SN 5420 Release 1.1.7. It is only available as an electronic document on Cisco.com and the Documentation CD-ROM.
Platform-Specific Documents
Platform-specific documents consist of the release notes, readme and example configuration files for Cisco Storage Networking iSCSI drivers. The files are currently available in electronic format only. See the "Obtaining Updated Software and iSCSI Drivers" section for details.
Hardware Documents
Refer to the Cisco SN 5420 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.
Software Documents
Refer to the Cisco SN 5420 Storage Router Software Configuration Guide 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 5420 web-based GUI, refer to the SN 5420 Storage Router web-based GUI online Help system.
Service and Support
For service and support for a product purchased from a reseller, contact the reseller, who offers a wide variety of Cisco service and support programs described in "Service and Support" of Cisco Information Packet shipped with your product.
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For service and support for a product purchased directly from Cisco, use Cisco.com.
Obtaining Documentation
The following sections explain how to obtain documentation from Cisco Systems.
World Wide Web
You can access the most current Cisco documentation on the World Wide Web at the following URL:
Translated documentation is available at the following URL:
http://www.cisco.com/public/countries_languages.shtml
Documentation CD-ROM
Cisco documentation and additional literature are available in a Cisco Documentation CD-ROM package, which is shipped with your product. The Documentation CD-ROM is updated monthly and may be more current than printed documentation. The CD-ROM package is available as a single unit or through an annual subscription.
Ordering Documentation
Cisco documentation is available in the following ways:
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http://www.cisco.com/public/ordsum.html
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http://www.cisco.com/go/subscription
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Documentation Feedback
If you are reading Cisco product documentation on Cisco.com, you can submit technical comments electronically. Click Leave Feedback at the bottom of the Cisco Documentation home page. After you complete the form, print it out and fax it to Cisco at 408 527-0730.
You can e-mail your comments to bug-doc@cisco.com.
To submit your comments by mail, use the response card behind the front cover of your document, or write to the following address:
Cisco Systems
Attn: Document Resource Connection
170 West Tasman Drive
San Jose, CA 95134-9883We appreciate your comments.
Obtaining Technical Assistance
Cisco provides Cisco.com as a starting point for all technical assistance. Customers and partners can obtain documentation, troubleshooting tips, and sample configurations from online tools by using the Cisco Technical Assistance Center (TAC) Web Site. Cisco.com registered users have complete access to the technical support resources on the Cisco TAC Web Site.
Cisco.com
Cisco.com is the foundation of a suite of interactive, networked services that provides immediate, open access to Cisco information, networking solutions, services, programs, and resources at any time, from anywhere in the world.
Cisco.com is a highly integrated Internet application and a powerful, easy-to-use tool that provides a broad range of features and services to help you to
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You can self-register on Cisco.com to obtain customized information and service. To access Cisco.com, go to the following URL:
Technical Assistance Center
The Cisco TAC is available to all customers who need technical assistance with a Cisco product, technology, or solution. Two types of support are available through the Cisco TAC: the Cisco TAC Web Site and the Cisco TAC Escalation Center.
Inquiries to Cisco TAC are categorized according to the urgency of the issue:
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Which Cisco TAC resource you choose is based on the priority of the problem and the conditions of service contracts, when applicable.
Cisco TAC Web Site
The Cisco TAC Web Site allows you to resolve P3 and P4 issues yourself, saving both cost and time. The site provides around-the-clock access to online tools, knowledge bases, and software. To access the Cisco TAC Web Site, go to the following URL:
All customers, partners, and resellers who have a valid Cisco services contract have complete access to the technical support resources on the Cisco TAC Web Site. The Cisco TAC Web Site requires a Cisco.com login ID and password. If you have a valid service contract but do not have a login ID or password, go to the following URL to register:
http://www.cisco.com/register/
If you cannot resolve your technical issues by using the Cisco TAC Web Site, and you are a Cisco.com registered user, you can open a case online by using the TAC Case Open tool at the following URL:
http://www.cisco.com/tac/caseopen
If you have Internet access, it is recommended that you open P3 and P4 cases through the Cisco TAC Web Site.
Cisco TAC Escalation Center
The Cisco TAC Escalation Center addresses issues that are classified as priority level 1 or priority level 2; these classifications are assigned when severe network degradation significantly impacts business operations. When you contact the TAC Escalation Center with a P1 or P2 problem, a Cisco TAC engineer will automatically open a case.
To obtain a directory of toll-free Cisco TAC telephone numbers for your country, go to the following URL:
http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml
Before calling, please check with your network operations center to determine the level of Cisco support services to which your company is entitled; for example, SMARTnet, SMARTnet Onsite, or Network Supported Accounts (NSA). In addition, please have available your service agreement number and your product serial number.
This document is to be used in conjunction with the documents listed in the "Related Documentation" section.
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All other trademarks mentioned in this document or Web site are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (0110R)
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