IBM(R) Multipath Subsystem Device Driver Path Control Module (PCM) Version 2.1.2.5 README FOR AIX? June 12, 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 1 Modification 2 Level 5 (SDDPCM 2.1.2.5) 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 1.0.0.7) 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 : This version of SDDPCM package requires host system having at least AIX52 TL08 with all latest PTFs, or AIX53 TL03 with all latest PTFs. SVC : This version of SDDPCM package requires host system having at least AIX52 TL08 with all latest PTFs, or AIX53 TL03 with all latest PTFs. Note : Following APARs are required, in order to run SDDPCM with SVC. AIX52 TL08 APAR : IY79157, IY81456 AIX53 TL03 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 3974 : (PMR30071,002,866) System may crash if user removes all SDDPCM hdisks while pcmpath is still running. 3980 : (PMR47707,550,000) Incorrect SDDPCM configure method debug definition caused numerous error messages during the SDDPCM mpio device configuration. 3986 : (PMR39718,49R,000) Customers experienced an endless error storm while running multi-host Oracle RAC and DS8K warmstart was triggered by some hardware problems. 3988 : (PMR39718,49R,000) pcmpath enable/disable SDDPCM internal health check command should notify pcmsrv, so it will start/stop the FAILED path health check when the internal health check is disabled/enabled. 3989 : Change SDDPCM default health check interval from 20 seconds to 60 seconds. 3990 : (PMR48045,49R,000) pcmsrv did not check the path state when it collected paths of a mpio device. pcmsrv would choose the wrong path for recovery if 'path id' and path index does not match. The consequence of this bug is that some FAILED paths did not get recovered when pcmsrv was performing the healthcheck. =============================================================================== 3.2 New Features None =============================================================================== 3.3 Feature/defect Details 3990: If you experience this pcmsrv path recovery problem and try to recover the paths manually by running "pcmpath set device path online/offline" command, there is a correction for this command to correctly identify the 'path id' value. See "Correction to User's Guide" section below. =============================================================================== 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. 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 AIX53 TL04 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 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 There is a code bug in SDDPCM v2125 that IO may not distributed balancely across all configured FC adapters. This problem is fixed in SDDPCM tempfix v2126. =============================================================================== 3.5 Corrections to User's Guide On page 108 the description of #2 under "installing SDDPCM from CD-ROM" should be read as: 2. The AIX SDDPCM host attachment package (devices.fcp.disk.ibm.mpio.rte) should be installed along with SDDPCM package (devices.sddpcm.52.rte, devices.sddpcm.53.rte, or devices.sddpcm.61.rte). Note: Do not reboot the system if you only have SDDPCM host attachment package installed. On page 108, under "Installing and upgrading the AIX SDDPCM host attachment" A warning should be added: warning: Do not reboot the system if you only have SDDPCM host attachment package installed. 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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