IBM(R) Subsystem Device Driver Version 1.60e README for Netware January 28, 2005 ------------------------------------------------------------------------------- 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 3.2 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 1.60e for Netware 5.1/6.0/6.5. 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 ESS or DS6000 or DS8000 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 the IBM TotalStorage DS6000 support: http://www-1.ibm.com/servers/storage/disk/ds6000/index.html Go to the following Web site for the IBM TotalStorage DS8000 support: http://www-1.ibm.com/servers/storage/disk/ds8000/interop.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 ------------------------------------------------------------------------------- 3.0 SDD Change History =============================================================================== 3.1 Defects Fixed =============================================================================== 3.2 New Features 3.2.1 Support new device type 2107 3.2.1 Support new device type 1750 3.2.3 A new tool CCLtool.nlm is added to support CCL. The current CCL procedure is: 1) First node is down for code download, the second node works for I/O. 2) After the first node finishes the code download, it will be brought up. After 30 minutes, the second node is shut down for code download. The current SDD fo/fb algorithm is: After a path failure occurs on a path, SDD closes that path and increases the error count on the path by 1. The path will be reopened after 2000 successful I/O operations through other operational paths. This process is called path recovery. If the consecutive error count on the path reaches three, SDD puts the path into the DEAD state. SDD reverts the failed path from DEAD state to OPEN state after 50000 successful I/O through an operational path or paths. This process is called path reclamation. If an access fails through the reopened path during path reclamation, SDD puts the path into INVALID state and then never attempts the path again. Only a manual operation using datapath command can reset a path from INVALID to OPEN. If all paths fail, SDD reports I/O error to application. During CCL, after the first node is down, half of the paths will have I/O errors and will be set to either CLOSE, DEAD or INVALID state depending on the I/O load. After the first node is brought up back and before the second node is shut down(during the 30 minutes gap), if the previous failed paths are already in INVALID state, they won't have chance to be automatically reclaimed; If they are in DEAD state, they may have chance to be either reclaimed if I/Os on working paths reach 50000; If they are in CLOSE state, they may have chance to be recovered if I/Os on working paths reach 2000. If the failed paths are not able to be either reclaimed or recovered during the 30 minutes gap, once the second node is down, errors will occur on good paths and now all paths fail, application fails afterwards. So, whether CCL will work with SDD depends on both I/O load and the timing. As a work around. We developed a new tool CCLtool--repeats of datapath set adapter online command. The usage of the command is: CCLtool Let's say the manual set online command is issued every 20 minutes which is 1200 seconds(smaller than the 30 minutes gap). With this command running after CCL is started, the limitations in the current fo/fb during CCL could be resolved. 3.2.4 PCR 2886(mark non-preferred path) CMVC sw 3120 To display 'non-preferred paths' in 'datapath query device' on the products that support preferred controller. This involves DS 6000. Non-preferred paths are marked * after the path id. The usage of the command is: datapath query device -l datapath query device [n] -l Output example: DEV#: 15 DEVICE NAME: 0x0015:[V597-A3-D3:5] TYPE: 1750500 SERIAL: 13AB2ZA1345 POLICY: Round Robin =============================================================================== Path# Device State Mode Select Errors 0* 0x0015:[V597-A3-D3:5] OPEN NORMAL 0 0 1 0x001D:[V597-A3-D4:5] OPEN NORMAL 23 0 2* 0x0077:[V597-A4-D3:5] OPEN NORMAL 0 0 3 0x007F:[V597-A4-D4:5] OPEN NORMAL 22 0 =============================================================================== 3.3 Feature Details =============================================================================== 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. 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