Table Of Contents
Release Notes for Cisco SN iSCSI Drivers
May 9, 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 the initial release of Cisco Storage Networking iSCSI Driver for Linux version 1.8.7, Microsoft Windows NT version 1.8.6, and Sun Solaris version 1.8.8.
For a list of open software caveats that apply to these versions, see the "Open Caveats" section. The caveats are updated for every maintenance version and are located on Cisco.com and the Documentation CD-ROM.
These Release Notes describe the following topics:
A Cisco Storage Networking iSCSI Driver provides a server with the ability to access storage through an IP network. The iSCSI driver uses iSCSI protocol to transport SCSI requests and responses over an IP network between the server and a Cisco SN 5420 Storage Router.
Architecturally, the iSCSI driver combines with the server TCP/IP stack, network drivers, and NICs to provide the same functions as a SCSI adapter driver with a host bus adapter (HBA).
The iSCSI driver provides a transport for SCSI requests and responses for storage devices; however, instead of providing a transport for directly attached devices, the driver transports the SCSI requests and responses between the server and a Cisco SN 5420 Storage Router via an IP network. The SN 5420 Storage Router, in turn, transports SCSI requests and responses between it and the storage devices attached to it.
Once the iSCSI driver is installed, the server will proceed with a discovery process for iSCSI storage devices as follows:
Step 1 The iSCSI driver requests available iSCSI targets from the storage router.
Step 2 The storage router sends available iSCSI target names to the server.
Step 3 The server logs into the iSCSI targets.
Step 4 The storage router accepts the server login and sends target identifiers.
Step 5 The server queries targets for device information.
Step 6 Targets respond with device information.
Step 7 The server creates table of internal devices.
The Cisco Storage Networking iSCSI drivers provide the following target and LUN support:
•The iSCSI driver for Linux provides IP access to a maximum of eight remote SCSI targets, with each target capable of supporting 32 LUNs.
•The iSCSI driver for Microsoft Windows NT provides IP access to a maximum of eight remote SCSI targets, with each target capable of supporting eight LUNs.
•The iSCSI driver for Sun Solaris provides IP access to a maximum of eight remote SCSI targets, with each target capable of supporting 32 LUNs.
Remote SCSI targets can be accessed through one or more storage routers up to a maximum of eight storage routers.
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.
This section describes the system requirements for the Cisco Storage Networking iSCSI Drivers and includes the following information:
Operating System Requirements
The Cisco Storage Networking iSCSI Drivers require the following operating system environments:
•The iSCSI Driver for Linux requires a Linux kernel version 2.2.16-3 or higher. The iSCSI Driver for Linux supports single-processor machines only; it cannot be run on multiprocessor machines.
•The iSCSI Driver for Microsoft Windows NT requires Microsoft Windows NT Server (or Workstation) version 4.0 with service pack 6a or later. The iSCSI Driver for Microsoft Windows NT supports single-processor and multiprocessor machines. For multiprocessor machines the driver supports up to four processors.
•The iSCSI Driver for Sun Solaris runs only on SPARC machines, and requires Solaris version 7 or 8 with all Sun-recommended patches installed for the version being used. The iSCSI Driver for Sun Solaris supports single-processor and multiprocessor machines. For multiprocessor machines the driver supports up to four processors.
See the readme file for the appropriate driver for additional information.
Note The Cisco Storage Networking iSCSI Driver for Microsoft Windows NT will not work with computers running Microsoft Windows 2000.
Obtaining the iSCSI Driver
To obtain the Cisco Storage Networking iSCSI drivers, accompanying readme files, and example configuration files, log in to Cisco.com and access the following URL:
In addition, you can check this website for information about the availability of new drivers, updated drivers, driver compatibility, and other relevant information.
Note This URL is subject to change without notice. If it changes, log in to Cisco.com (CCO) and click Software Center at Service & Support. At Software Center, click Storage Networking Software.
Uninstalling iSCSI Driver Software
The readme file for each Cisco Storage Networking iSCSI Driver contains complete instructions for removing the iSCSI driver software.
This section describes possibly unexpected behavior by Cisco Storage Networking iSCSI Driver software. All the caveats listed in this section are open. They consist of severity 1 and 2 caveats, and selected caveats of other severity levels. Caveats are listed according to driver.
For a more complete list of caveats against these versions, 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 release. You can reach Bug Navigator II on Cisco.com at Service & Support: http://www.cisco.com/pcgi-bin/Support/Bugtool/launch_bugtool.pl.
iSCSI Driver for Linux Version 1.8.7
The iSCSI driver for Linux version 1.8.7 has no open severity 1 or 2 caveats.
iSCSI Driver for Microsoft Windows NT Version 1.8.6
This problem occurs when a Microsoft Windows NT server is attached to LSI RAID via a Cisco SN 5420 Storage Router, and the server has both the iSCSI and RDAC drivers installed. RDAC is LSI's dual path failover driver. When the server is running both drivers, the NT Disk Administrator will see redundant paths to each LSI RAID disk when the Windows NT server is rebooted.
Workaround: Use LSI's "hot_add" utility to save boot information, instead of using the iSCSI driver's "save boot info" button. Perform the following steps:
Step 1 Clear boot information using the iSCSI Control Panel applet.
Step 2 Reboot the Windows NT host.
Step 3 Run LSI's "hot_add" utility.
Step 4 Run LSI's "SM7devices" utility and verify that the correct number of disks appear, as well as 2 UTM (access) LUNs. If no disks appear, run the "hot_add" utility again. If redundant disks appear, return to Step 1 and repeat this procedure.
Step 5 Run Windows NT Disk Administrator and assign drive letters to the LSI disks.
iSCSI Driver for Sun Solaris Version 1.8.8
The iSCSI driver for Sun Solaris version 1.8.8 has no open severity 1 or 2 caveats.
The following sections describe the related documentation available for the Cisco Storage Networking iSCSI Driver for Linux version 1.8.7, Microsoft Windows NT version 1.8.6, Sun Solaris version 1.8.8, and the Cisco SN 5420 Storage Router. These documents consist of the iSCSI driver release notes, readme and example configuration files, and the storage router hardware installation and software configuration guides.
The iSCSI driver readme files and example configuration files are available in electronic format, as part of the software download package. See the "Obtaining the iSCSI Driver" section for details. The storage router hardware installation and software configuration documentation sets are available as printed manuals or electronic documents.
This Release Notes document is the only document specific to Cisco Storage Networking iSCSI Driver for Linux version 1.8.7, Microsoft Windows NT version 1.8.6, and Sun Solaris version 1.8.8. It is located on Cisco.com and the Documentation CD-ROM.
Each release of storage router software includes an associated Release Notes document, which is also available as an electronic document on Cisco.com and the Documentation CD-ROM.
Refer to the Cisco SN 5420 Storage Router Hardware Installation Guide for storage router 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 5420 Storage Router Software Configuration Guide for storage router software 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 storage router web-based GUI, refer to the SN 5420 Storage Router web-based GUI online Help system.
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