IBM(R) Multipath Subsystem Device Driver Path Control Module (PCM) Version 2.1.2.0 README FOR AIX™ Jan. 8, 2007 --------------------------------------------------------------------------- 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 SDDPCM 3.0 SDDPCM change history 3.1 Defects Fixed 3.1.1 ESS/DS8000/DS6000/SVC defects 3.2 New Features 3.3 Feature Details 3.4 Known issues 3.5 Correction to User's Guide 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 Multipath Subsystem Device Driver Path Control Module(SDDPCM). This README file contains the most recent information about the IBM Multipath Subsystem Device Driver PCM, Version 2 Release 1 Modification 2 Level 0 (SDDPCM 2.1.2.0) for AIX. IBM recommends that you print and review the contents of this README file before installing and using SDDPCM on AIX with MPIO-capable disk driver. You can find the most current documentation and support information Abut AIX MPIO-capable devices on the Web site: http://publib16.boulder.ibm.com/pseries/en_US/aixbman/baseadmn/manage_mpio.htm IBM recommends that you go to the following Web site to get the most current information about this release of SDDPCM: http://www.ibm.com/servers/storage/support/software/sdd/ You should carefully review the following information available through the website: 1. The most current README file. This will contain corrections to this readme file, corrections to the SDD User's Guide, and other documentation updates discovered since this copy of the README was prepared. 2. The Multipath SDD Users' Guide. Because SDDPCM can be installed in so many different environments / configurations, detailed information about each environment is placed in the appropriate chapter of the Multipath 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 periodically to see any new Flashes that have been posted since your last review. For prerequisites information, be sure to look in the Multipath 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. DS8000 2. DS6000 3. SAN Volume Controller 4. ESS 1.2 How to get help Go to the following Web site for SDD/SDDPCM technical support and for the most current SDD documentation and support information: http://www.ibm.com/servers/storage/support/software/sdd/ Go to the following Web site for the IBM ESS Open Systems support: http://www.ibm.com/servers/storage/disk/ess/ Go to the following Web site for IBM TotalStorage DS8000 support: http://www.ibm.com/servers/storage/disk/ds8000/index.html Go to the following Web site for IBM TotalStorage DS6000 support: http://www.ibm.com/servers/storage/disk/ds6000/index.html Go to the following Web site for IBM SVC support: http://www.ibm.com/servers/storage/support/software/sanvc Call one of the following numbers to obtain non-technical 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 SDDPCM Prior to install SDDPCM, you must deinstall "ibm2105.rte"(version of 32.6.100.XX) and "devices.fcp.disk.ibm.rte"(version of 1.0.0.XX) host attachment for SDD driver, and the SDD package. The SDD driver and SDDPCM module can not coexist on one server. You must install the following host attachment for SDDPCM : ESS/DS8000/DS6000/SVC : devices.fcp.disk.ibm.mpio.rte (version 1.0.0.6) ESS/DS8000/DS6000 : This version of SDDPCM package requires host system having at least AIX 52L with all latest PTFs, or AIX 53D with all latest PTFs. SVC : This version of SDDPCM package requires host system having at least AIX 52L with all latest PTFs, or AIX 53D with all latest PTFs. Note : Following APARs are required, in order to run SDDPCM with SVC. AIX 52L APAR : IY79157, IY81456 AIX 53D APAR : IY79165, IY81545 Important: ESS SCSI devices are not supported by SDDPCM and no ESS host attachment for SCSI MPIO support is released. If you already have an earlier version(version earlier than v33.6.100.9) of SDDPCM host attachment installed, and you are going to update to new SDDPCM host attachment version 1.0.0.0 or later, you must remove all SDDPCM mpio devices, before you start to update this package. This is because the ESS device type is changed, starting from the version of 33.6.100.9 and beyond. --------------------------------------------------------------------------- 3.0 SDDPCM change history =============================================================================== 3.1 Defects Fixed 3.1.1 ESS/DS8000/DS6000/SVC defects 3955 : Add a shared library to avoid displaying system loader errmsg when application calls the SDDPCM user interface library function while the user interface library hasn't loaded yet. =============================================================================== 3.2 New Features None =============================================================================== 3.3 Feature/defect Details 3955 : If user starts 'pcmsrv' or 'pcmpath' SDDPCM programs, or 'fcppcmmap' evoked by system 'cfgmgr' configure methods, without having any SDDPCM mpio devices configured, then one of the following error message will be displayed : exec(): 0509-036 Cannot load program pcmpath because of the following errors: 0509-130 Symbol resolution failed for pcmpath because: 0509-136 Symbol sddUserInterface (number 41) is not exported from dependent module /unix. 0509-192 Examine .loader section symbols with the 'dump -Tv' command. exec(): 0509-036 Cannot load program /usr/sbin/fcppcmmap because of the following errors: 0509-130 Symbol resolution failed for fcppcmmap because: 0509-136 Symbol sddUserInterface (number 46) is not exported from dependent module /unix. 0509-192 Examine .loader section symbols with the 'dump -Tv' command. This error message was from system loader, due to no SDDPCM user library is loaded into the kernel yet, since there is no SDDPCM mpio device being configured. This problem is resolved with this feature. =============================================================================== 3.4 Known issues Based on current AIX MPIO disk driver design, there is no mechanism for SDDPCM to control the number of LUNs configured and the number of paths per device. That means that you can configure more than 1200 LUNs on a system, with any number of paths per device. Thus, when SDDPCM announces support for a maximum of 1200 LUNs, it means that SDDPCM can support a maximum of 1200 LUNs per host. It is your responsibility for the problems caused by configuring more than 1200 LUNs. SDDPCM will also follow the rules set in the SDD table for maximum number of paths per device. In order to configure large number of devices (up to 1200), you should ensure that the system has enough resources to support this large configuration. For detailed information, refer to the information in Section 5.3 of the SDD User's Guide. Starting from SDDPCM v2111, SDDPCM supports DB2/pSeries/Storage Synergy feature - Cache Hint This feature only be supported on AIX53E(53 ML04) or above in 64bit kernel. Because of this, SDDPCM needs to set different VERSION based on the OS ML running on the server. However the way SDDPCM used to distinguish OS ML does not work during the system boot phase. Therefore, in the case that your system is at 53E 64bit kernel, and you are running DB2 database with cache hint enabled, you will encounter a problem after your system is rebooted, since the cache hint function will be disabled in SDDPCM during the boot time. To solve or work around this problem, there are 2 choices user can select based on your situation : 1. To re-enable cache hint function after system rebooted, you need to un- configure/re-configure all DS8000 MPIO devices. followings are the steps to implement for this process: steps : -------------- 1) stopsrc -s pcmsrv 2) umount FS build on SDDPCM DS8000 Volume Group 3) varyoff volume groups created with SDDPCM DS8000 MPIO hdisks. 4) rmdev -l hdiskX /* execute this command to all SDDPCM configured hdisks */ 5) cfgmgr -v /* configure SDDPCM MPIO hdisks to Available state */ 6) varyon volume groups created with SDDPCM DS8000 MPIO hdisks. 7) mount FS built on SDDPCM DS8000 volume groups 8) startsrc -s pcmsrv 2. If you know your system will be at AIX53E or above in 64bit kernel, and your application is DB2 database with cache hint enabled, then we strongly recommend you to call SDD/SDDPCM Level 2 support, to get a SDDPCM install image just for this environment. With this special SDDPCM package for 53E/64bit kernel, you don't have to unconfigure/reconfigure SDDPCM DS8000 hdisks after system rebooted. The cache hint function is enabled always. The name of this SDDPCM package is "devices.sddpcm.53E.rte" After installed this SDDPCM package, the package name listed by "lslpp" command is displayed as "devices.sddpcm.53.rte". However the discription of this package is changed to : devices.sddpcm.53.rte 2.1.2.0 COMMITTED IBM SDD PCM for AIX V53E =============================================================================== 3.5 Corrections to User's Guide Documentation on path id in the SDDPCM chapter (Chapter 3) is confusing to users and might mislead users to enter a wrong path id in "pcmpath open device path" and "pcmpath set device path" commands. On page 129, the description of "path number" should be: The path id that you want to change, as displayed under "Path Name" by the "pcmpath query device" command. On page 134, the sample output of "pcmpath query device" command is incorrect. The correct sample output should be: DEV#: 10 DEVICE NAME: hdisk10 TYPE: 2105800 ALGORITHM: Load Balance SERIAL: 7BFFCA30 =========================================================================== Path# Adapter/Path Name State Mode Select Errors 0 fscsi1/path2 CLOSE NORMAL 0 0 1 fscsi1/path3 CLOSE NORMAL 0 0 2 fscsi0/path0 CLOSE NORMAL 0 0 3 fscsi0/path1 CLOSE NORMAL 0 0 Also on page 134, the description of "Path Name" should be: The name of the path. Number displayed as part of the name is the path id of this path that should be used by "pcmpath open device path" and "pcmpath set device path" commands. On page 145, the description of "path number" should be: The path id that you want to change, as displayed under "Path Name" by the "pcmpath query device" command. --------------------------------------------------------------------------- 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. BY USING THE PROGRAM AND DOCUMENTATION, YOU AGREE TO ABIDE BY THESE TERMS AND APPLICABLE COPYRIGHT LAWS. IBM LIMITS YOUR ACCEPTANCE OF THE PROGRAM AND DOCUMENTATION TO THE TERMS OF THIS AGREEMENT. The Program and Documentation is owned by International Business Machines Corporation or one of its subsidiaries (IBM) or IBM suppliers, and is copyrighted and licensed, not sold. IBM does not transfer title to this Program and Documentation to you. 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