IBM(R) Multipath Subsystem Device Driver Path Control Module (PCM) Version 2.2.0.4 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 2 Modification 0 Level 4 (SDDPCM 2.2.0.4) 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 in general 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 Please refer to SDD support matrix to determine the supported SDD levels for above storage subsystem. 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 1.0.0.14) ESS/DS8000/DS6000/SVC: This version of SDDPCM package requires host system having at least AIX52 TL10 with all latest PTFs, or AIX53 TL06, or AIX61 with all latest PTFs. Following AIX ARAPs are required: AIX52 TL10: ARAP IY99799 AIX53 TL06 APAR IY99798 These APARs are included in AIX52 TL10 SP2, and AIX53 TL06 SP2 If you are running SVC release which includes APAR IC55826 (SVC v4.2.1.6 and above), or SVC release prior to SVC v4.2.1.6 with an iFix on LONG BUSY support, the following AIX APARs are required for your AIX Technology Level: AIX52 TL10: APAR IZ08216 IZ20170 IZ28287 AIX53 TL06: APAR IZ06622 IZ20198 IZ28285 AIX53 TL07: APAR IZ06490 IZ19199 IZ26561 AIX53 TL08: APAR IZ07063 IZ20199 IZ26655 AIX61 TL00: APAR IZ09534 IZ20201 IZ26657 AIX61 TL01: APAR IZ06905 IZ20202 IZ26658 The AIX APARs are available from AIX fix central website: http://www-912.ibm.com/eserver/support/fixes/fixcentral/main/pseries/aix The 3rd colume of APARs may not be published yet, however they are available in ifix format. You can download these ifix from AIX ifix website: ftp://ftp.software.ibm.com/aix/efixes. This is an anonymous ftp site. Please contact AIX support in case you have problem to obtain above listed APARs or ifixes. If you are running SVC release which includes APAR IC55826 (SVC v4.2.1.6 and above), or SVC release prior to SVC v4.2.1.6 with an iFix on LONG BUSY support, and your system is configured as VIO server with IOS level 1.5.2.1, the following VIOS interim fixes are required: IOS Level 1.5.2.1 Interim Fix IZ19199 IZ26655 The AIX APARs are available from AIX fix central website: http://www-912.ibm.com/eserver/support/fixes/fixcentral/main/pseries/aix 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 4123 Need to change design for handling last non-working path. 4223 Support automatically release leftover SCSI-2 reserve on SAN boot device upon system reboot. This might occur when user migrating from AIX default pcm to SDDPCM with SAN boot. 4228 System may crash when removing a device while SDDPCM CLI - pcmpath is called to this device. 4263 (PMR66002) Need to use inquiry command to handle the special case that EBUSY returned from SVC device when LUN is not accessible. 4264 cfgmgr prints error message when no IBM storage is attached to host system. 4275 (PMR51284) I/O hangs if all paths failed with reservation conflict. 4287 (PMR67900) I/O hanging during SVC node powering up and vdisk is not mapped yet 4300 (PMR72756) pcmsrv failed to do health check on CLOSED or CLOSE_FAILED paths. 4310 (PMR12241) SAN boot halt at '554' after first reboot from migration script 4345 SDDPCM health check 'failed' mode did not work as designed 4346 Need to remove adapter from SDDPCM if all the attached devices/paths are removed. 4398 SAN boot fails if SCSI-2 is leftover on the boot device. 4410 (PMR20081) SDDPCM put good paths into FAILED state, and failed to reserve last path. 4424 cfgmgr displays error msg if no storage attached and devices in Defined state 4428 Need to check specific Cache Hint values, instead of nonzero 4431 (PMR34527) Adatepr stays in Degraded state after last FAILED path being removed =============================================================================== 3.2 New Features None =============================================================================== 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. 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 and above. This feature support is dependent on the usage of raw devices and certain levels of the DS8000 microcode. In addition, this feature is only supported on AIX53E(53 TL04) or above with 64bit kernel. SDDPCM enables the cache hint feature if it detects the correct AIX technology level and DS8000 microcode level. =============================================================================== 3.5 Corrections to User's Guide None --------------------------------------------------------------------------- 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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