IBM(R) Multipath Subsystem Device Driver Path Control Module (PCM) Release 2.2.0.0 README for AIX? May 10, 2010 --------------------------------------------------------------------------- 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 2 Modification 0 Level 0 (SDDPCM 2.2.0.0) 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 1.0.0.11) Following lists of required AIX and VIOS apars and service packs are cumulative. Apars required in earlier versions of SDDPCM packages are also required for later versions of SDDPCM packages, unless specifically noted as 'no longer applicable' or 'not required'. ESS/DS8000/DS6000/SVC: This version of SDDPCM package requires host system having at least AIX52 TL10 with all latest PTFs, or AIX53 TL06 with all latest PTFs. Following AIX APARs are required: AIX52 TL10: APAR IY99799 AIX53 TL06: APAR IY99798 These APARs are included in AIX52 TL10 SP2, and AIX53 TL06 SP2 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. Attention: If your server is booting from SAN boot disk and you are migrating AIX OS and SDDPCM, refer to the instructions in SDD User's Guide and this flash: http://www-01.ibm.com/support/docview.wss?rs=540&context=ST52G7&uid=ssg1S1002845&loc=en_US&cs=utf-8&lang=en --------------------------------------------------------------------------- 3.0 SDDPCM change history =============================================================================== 3.1 Defects Fixed 3.1.1 ESS/DS8000/DS6000/SVC defects 4093 : Should Recover FAILED path if healthcheck inquiry command returns with dynamic tracking error when dynamic tracking is turned on. 4098 : (mc 210946) System crashed if removing the last SDDPCM device while pcmpath is running due to bad kmid value 4121 : Should not select a path for I/O which failed with distributed error. 4122 : Should not fail last path during the healthcheck. 4156 : pcmpath query wwpn command displayed incorrect wwpn of FC adatper. 4160 : pcmpath -i did not sleep for x seconds. =============================================================================== 3.2 New Features 4099/4101 : Add AIX6.1 support. =============================================================================== 3.3 Feature/defect Details None =============================================================================== 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. Starting from SDDPCM v2111, SDDPCM supports DB2/pSeries/Storage Synergy feature - Cache Hint. Cache Hint is supported by DB2 Version 9. This support is dependent on the usage of raw devices and certain levels of the DS8000 microcode. Also, this feature is only supported on AIX53E(53 ML04) or above in 64bit kernel. SDDPCM enables cache hint feature when it detects the correct AIX maintenance level and DS8000 microcode level. But due to a limitation on determining the AIX maintenance level at system boot time, SDDPCM will not be able to find out the AIX maintenance level at system boot time. As a result, cache hint feature will be disabled after system is rebooted. 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 AIX53 TL04 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 53 TL04/64bit 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 2.1.3.X COMMITTED IBM SDD PCM for AIX V53E =============================================================================== 3.5 Corrections to User's Guide User's Guide 1.8-2.4* version, on page 134, under "3. To query and display which type of persistent reservation is on a device, enter pcmquerypr -Vh /dev/hdisk#.", a note should be added: Note: Since SVC LUN returns Good status for SCSI-3 persistent reserve commands, even SCSI-2 reserve presents on the LUN, therefore, pcmquerypr command can not be used to verify if SCSI-2 reserve presents on the SVC LUN or not. --------------------------------------------------------------------------- 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. 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