IBM(R) Subsystem Device Driver Version 1.5.1.1-7 README for Linux May 7, 2004 ------------------------------------------------------------------------------- CONTENTS 1.0 About this README file 1.1 Who should read this README file 1.2 How to get help 2.0 Prerequisites for SDD 3.0 SDD change history 3.1 Defects Fixed 3.1.1 Common 3.1.2 ESS defects 3.1.3 SVC defects 3.2 New Features 3.3 Feature Details 3.4 Known issues 4.0 User license agreement for IBM device drivers 4.1 Background / Purpose 4.2 Definitions 4.3 License grant 4.4 Responsibilities 4.5 Confidential information 4.6 Limitation of liability 4.7 Termination 4.8 Representations and warranties 4.9 General provisions 4.10 Appendix A 5.0 Notices 6.0 Trademarks and service marks ------------------------------------------------------------------------------- 1.0 About this README file Welcome to IBM Subsystem Device Driver (SDD). This README file contains the most recent information about the IBM Subsystem Device Driver, Version 1 Release 5 Modification 1 Level 1-7 (SDD 1.5.1.1-7) for Linux. You should consult the SDD User's Guide to determine if the functionality described here applies to your product environment. See item 2 below. IBM recommends that you go to this Web site to get the most current information about this release of SDD: http://www-1.ibm.com/servers/storage/support/software/sdd.html You should carefully review the following information available through that site: 1. The most current README file. This will contain corrections to the readme file, corrections to the SDD User's Guide, and documentation updates made discovered since this copy of the README was prepared. 2. The SDD Users' Guide. Because SDD can be installed in so many different environments / configurations, detailed information about each environment is placed in the appropriate chapter of the SDD Users Guide. The 'Summary of Changes' section of the SDD Users' Guide can help you quickly determine if the latest changes affect you. 3. The Flashes. As we become aware of any information that is likely to impact a broad set of our customers, Flashes are prepared and posted on this site. You should review this section periodocally to see any new Flashes that have been posted since your last review. For prerequisites information, be sure to look in the SDD User's Guide as well as the prerequisites section of this readme file for the latest updates. 1.1 Who should read this README file This README file is intended for storage administrators, system programmers, and performance and capacity analysts. The information in this file only applies to customers who run: 1. ESS or SAN Volume Controller or SAN Volume Controller for Cisco MDS 9000 2. ESS and SAN Volume Controller 3. ESS and SAN Volume Controller for Cisco MDS 9000 1.2 How to get help Go to the following Web site for SDD technical support and for the most current SDD documentation and support information: http://www-1.ibm.com/servers/storage/support/software/sdd.html Go to the following Web site for the IBM ESS Open Systems support: http://www.storage.ibm.com/hardsoft/products/ess/supserver.htm Go to the following Web site for IBM TotalStorage SAN Volume Controller support: http://www.ibm.com/servers/storage/support/virtual/2145.html Go to the following Web site for IBM TotalStorage SAN Volume Controller for Cisco MDS 9000 support: http://www.ibm.com/servers/storage/support/virtual/2062-2300.html Call one of the following numbers to obtain nontechnical or administrative support, such as hardware and software orders, hardware maintenance, services contract of entitlement, and invoices: .For commercial or state and local support operations: 1-877-426-6006 (Listen to the voice prompts) .For business partner support operations: 1-800-426-9990 .For federal government support operations: 1-800-333-6705 ------------------------------------------------------------------------------- 2.0 Prerequisites for SDD One of the following combinations of linux distribution and associated vendor compiled binary kernel packages: Red Hat 7.x Linux (x86) with one of the following kernels: kernel-bigmem-2.4.18-24.7.x kernel-bigmem-2.4.18-27.7.x kernel-bigmem-2.4.20-28.7.x * kernel-smp-2.4.20-28.7.x * Red Hat Enterprise Linux 2.1 (x86) with one of the following kernels: kernel-enterprise-2.4.9-e.30 kernel-enterprise-2.4.9-e.34 kernel-enterprise-2.4.9-e.35 kernel-enterprise-2.4.9-e.38 kernel-enterprise-2.4.9-e.40 * kernel-summit-2.4.9-e.30 kernel-summit-2.4.9-e.34 kernel-summit-2.4.9-e.35 kernel-summit-2.4.9-e.38 kernel-summit-2.4.9-e.40 * Red Hat Enterprise Linux 3.0 (x86) with one of the following kernels: kernel-smp-2.4.21-9.EL kernel-smp-2.4.21-9.0.1.EL kernel-smp-2.4.21-9.0.3.EL* kernel-hugemem-2.4.21-9.EL kernel-hugemem-2.4.21-9.0.1.EL kernel-hugemem-2.4.21-9.0.3.EL * Red Hat Enterprise Linux 3.0 (ppc64) with one of the following kernels: kernel-2.4.21-9.EL kernel-2.4.21-9.0.1.EL kernel-2.4.21-9.0.3.EL * SuSE SLES7 (x86) with kernel: k_smp-2.4.18-224 k_smp-2.4.18-281 * SuSE SLES8 / UnitedLinux 1.0 (x86) with one of the following kernels: k_smp-2.4.21-138 k_smp-2.4.21-169 k_smp-2.4.21-190 k_smp-2.4.21-198 k_smp-2.4.21-215 * SuSE SLES8 (ppc64) with one of the following kernels: kernel-ppc64-2.4.21-111 kernel-ppc64-2.4.21-147 kernel-ppc64-2.4.21-154 kernel-ppc64-2.4.21-155 kernel-ppc64-2.4.21-215 * * Not officially supported ------------------------------------------------------------------------------- 3.0 SDD Change History 1.5.1.1-7 o Defect fixes (see below). o New kernel support levels (see above). o New unsupported kernel support levels (see below). o Performance improvement to Optimized pathing algorithm. o Work around for linux kernel discarding data buffers. o Add support for 2048 scsi disks. o New support for sddsrv network security options (see /etc/sddsrv.conf). o Improved trace logging. o Tuned sddsrv probing and reclaimation timers. o Updated rcscripts for iscsi interoperability. =============================================================================== 3.1 Defects Fixed 3.1.1 Common 1.5.1.1-7 o 2559 Fix for hang with raw device error handling after kernel change introduced in SLES8 UL1 SP3 kernel errata and later). o 2511 SuSE chkconfig entries were incorrectly defaulting to on in runlevels 3, 4, and 5. These were turned off to be consistent with RedHat and documentation. By default SDD will not start at system boot time. o 2509 Fix race/assert on concurrent opens of vpath partitions. o 2449 Fix cfgvpath failure on invalid /etc/fstab entries. o 2391 SVC CMVC 60558, work around for sddsrv hang. Does not fix why it hung, but attempts to un-hang the process on hang detection, also removes the repetative debug message which filled the log on a hang and caused any messages dealing with why it hung to be lost. o 2360 Fix sddsrv crash on systems with more than 128 disks. o 59136 Remove spinlock deadlock in IO error handler thread. o 59715 Add copy to/from userspace on disk geometry ioctls. 3.1.2 ESS defects 3.1.3 SVC defects =============================================================================== 3.2 New Features 1.5.1.1-7 o New kernel support levels (see above). o New unsupported kernel support levels (see below). o Performance improvement to Optimized pathing algorithm. o Work around for linux kernel discarding data buffers. o Support for 2048 scsi disks for kernels which support it (eg: SuSE SLES8 UL1 SP3 kernel errata and later). o New support for sddsrv network security options (see /etc/sddsrv.conf). o Automatic saving of sddsrv and driver traces to /var/log. o Sddsrv supports signal SIGUSR2 to disable automatic saving of traces. o Tuned sddsrv probing and reclaimation timers. o Updated rcscripts for iscsi interoperability. =============================================================================== 3.3 Feature Details 1.5.1.1-7 o Add performance improvement to Optimized pathing algorithm. This has shown a performance improvement of up to 50% in some cases. o Work around for linux kernel discarding data buffers: When all paths fail and a write error occurs, SDD will now fail all IO rather than retrying on another path, which could lead to data loss. The failed device can only be put back online by completely closing and opening the vpath device. o Add support for 2048 scsi disks for SuSE UL1 SP3. The limit is not hard coded at 2048, but limited by the number of majors available on Linux 2.4 kernels (256 * 16 devices per major), and the fact that the SDD driver also needs majors. o New support for sddsrv network security options: Port 20001 access for sddsrv remote monitoring has been disabled by default, but may be turned back on by the user by editing /etc/sddsrv.conf. o Trace output from sddsrv and sdd is now written automatically to the files /var/log/sddsrv.log and /var/log/sdd.log respectively. These log files are automatically rotated by logrotate. o The automatic log saving is performed by sddsrv and will cause the module count for sdd-mod to always be positive. In order to 'rmmod sdd-mod' you must now first 'killall -USR2 sddsrv' to signal sddsrv that it should close /dev/IBMsdd and allow the driver to be unloaded. Invoking the sdd rcscript as 'sdd stop' will do this automatically. o To facilitate interoperability with the Cisco/Sourceforge iscsi driver (http://sourceforge.net/projects/linux-iscsi/) the 'sdd start' portion of the rcscript will call 'iscsi-mountall' if appropriate. o The sddsrv probing and reclaimation timers are now set to 3 and 1 minutes respectively. Paths will now become available much faster after a path error is corrected. o Additional kernel levels are now supported. Please refer to the prerequisites section above for a complete listing of supported distributions and kernels. o NOTE: SDD modules compiled against additional kernels are now provided. These kernel levels are not officially certified by the storage products SDD supports, but are provided as-is for user flexibility: kernel-smp-2.4.20-28.7 (RedHat 7.x x86) kernel-bigmem-2.4.20-28.7 (RedHat 7.x x86) kernel-enterprise-2.4.9-e.40 (RedHat EL 2.1 x86) kernel-summit-2.4.9-e.40 (RedHat EL 2.1 x86) kernel-smp-2.4.21-9.0.3.EL (RedHat EL 3 x86) kernel-hugemem-2.4.21-9.0.3.EL (RedHat EL 3 x86) kernel-2.4.21-9.0.3.EL (RedHat EL 3 ppc64) k_smp-2.4.18-281 (SuSE SLES7 x86) k_smp-2.4.21-215 (SuSE SLES8/UL1 x86) kernel-ppc64-2.4.21-215 (SuSE SLES8 ppc64) =============================================================================== 3.4 Known Issues ------------------------------------------------------------------------------- 4.0 User license agreement for IBM device drivers NOTICE: PLEASE READ THIS AGREEMENT CAREFULLY BEFORE USING THE PROGRAM AND DOCUMENTATION. IBM(R) WILL ONLY LICENSE THIS PROGRAM AND DOCUMENTATION TO YOU IF YOU FIRST ACCEPT THE TERMS OF THIS AGREEMENT. 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