IBM(R) Multipath Subsystem Device Driver Path Control Module (PCM) Version 2.4.0.0 README FOR AIX? October 14, 2011 --------------------------------------------------------------------------- CONTENTS 1.0 About this README file 1.1 Who should read this README file 1.2 How to get latest support version information 2.0 Prerequisites for SDDPCM 3.0 SDDPCM change history 3.1 Defects Fixed 3.2 New Features 3.3 Feature Details 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 4 Modification 0 Level 0 (SDDPCM 2.4.0.0) 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. 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 5. DS4000 6. DS5000 1.2 How to get latest support version information 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 SAN Volume Controller web site for latest SDD/SDDPCM support version for SAN Volume Controller: http://www-03.ibm.com/systems/storage/software/virtualization/svc/interop.html Go to the following System Storage Interoperation center(SSIC) web site for latest SDD/SDDPCM support version for all other supported IBM storage subsystems: http://www-03.ibm.com/systems/support/storage/config/ssic/displayesssearchwithoutjs.wss --------------------------------------------------------------------------- 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 to support DS4000 and 5000 storage devices: ESS/DS8000/DS6000/SVC/DS4000/DS5000: devices.fcp.disk.ibm.mpio.rte (version 1.0.0.15) 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'. Note: VIOS is not supported with SDDPCM on DS4000 and DS5000 subsystem devices. ESS/DS8000/DS6000/SVC: 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 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 VIOS level 1.5.2.1, the following VIOS interim fixes are required: VIOS Level 1.5.2.1 Interim Fix IZ19199 IZ26655 DS4000/DS5000: If you are running DS4000 or DS5000 storage subsystem, this version of SDDPCM package requires host system having at least AIX53 TL06 with all latest PTFs or AIX610 with all latest PTFs. Following AIX APARs are required for DS4000 or DS5000 subsystem devices: AIX53 TL06: IZ36257 AIX53 TL07: IZ36258 AIX53 TL08: IZ36259 AIX53 TL09: IZ36203 AIX61 TL00: IZ36255 AIX61 TL01: IZ36256 AIX61 TL02: IZ36221 The AIX APARs are available from AIX fix central website: http://www-912.ibm.com/eserver/support/fixes/fixcentral/main/pseries/aix --------------------------------------------------------------------------- 3.0 SDDPCM change history =============================================================================== 3.1 Defects Fixed 4453: Merged latest AIX PCM code changes. 4456: Need to handle controller failover failing cases differently. 4457: Improve controller failover logic to prevent unnecessary overlapped calls. 4458: Non-APSDDPCM open failure during multiple disk parallel open. 4459: Need to clear PCM_FAILED bit of a CLOSED path, so POF will be able to open the path later. 4344: 'values' field of model_map ODM attribute should be empty. 4462: A few hdisks failed blast test during CCDL. 4465: A code bug that failed to wakeup daemon. 4466: Failed to retry non-preferred path if last preferred path hit reservation conflict. 4468: Driver trace collected by sddpcmgetdata does not contain all data 4469: "pcmpath query device aa/ap" is an incorrect syntax and should return proper error message. 4471: Remove DS3K support from pcmpath usage. 4477: Incorrect path state displayed during adapter offline/online test 4478: LSI ofline+mediascan error injection test failed with HTX IO HUNG. 4479: pcmsrv sometime couldn't stop with tcp/ip port enabled. 4492: Additional fix for feature 4430. 4496: Disable last enabled path command should be failed to the caller. 4497: Need to reserve some path states when path is closed. 4506: Potential race condition in multiple disk parallel open. 4509: query port shows incorrect enabled paths. 4512: update ds4k/ds5k related packaging files 4517: fix DS4K reset error injection failure problem, and set path offline command issue. 4524: multiple APSDDPCM cli command fixes, and change default health_check interval to 60 seconds. 4526: pcmpath query port/portstats command results illegal instruction. 4527: incorrect table index caused system crash. =============================================================================== 3.2 New Features 4292: Add DS5000 subsystem device support. 4291: Support DS4000 and DS5000 autorecovery. 4430: (OAR1201)Add a new Load Balancing algorithm that balances the I/O load by taking into account the total weight of port and adapter associated to the paths 4498: support 'sddpcm_get_config' tool for DS4000 and DS5000, to display DS4000 and/or DS5000 storage/devices configuration information. =============================================================================== 3.3 Feature/defect Details 4430: New path select algorithm - load balancing port is only supported for Active/Active and Active/Asymmetric storage devices. It is not supported for DS4000 and DS5000 storage devices. 4498: 'sddpcm_get_config' is a tool to query DS4000 and DS5000 storage and devices configuration information. It has the similar syntax as AIX 'mpio_get_config' command. Please refer to SDD User's Guide, chapter 3 for detail syntax information. =============================================================================== 3.4 Known issues SDDPCM supports 'pcmpath set adapter online|offline aa|ap' command. For FC adapter connected to DS4000 or DS5000 active/passive storage devices, you should use 'ap' parameter to indicate this is an adapter connected to DS4000 and/or DS5000 storages devices. If an adapter is connected to other storage devices, then you should use 'aa' parameter. Since set an adapter OFFLINE may cause DS4000 and/or DS5000 LUN fails over to an alternate controller, this command is only supported when the AIX server has one DS4000 or DS5000 storage subsystem configured. This command may not work correctly if you have more than one DS4000 or DS5000 storage subsystem devices configured on one AIX server, and 'set adapter offline' command causes multiple subsystem device models migrating from one controller to alternate controller. Please refer to SDD User's Guide, chapter 3 for detail information of this command. There are known AIX disk driver configuration issues, which fails the migration of DS4000 and/or DS5000 subsystem devices from fcparray(RDAC) driver non mpio devices to SDDPCM mpio devices; or from AIX native mpio devices to SDDPCM mpio devices. Therefore, the SAN boot function is not supported with DS4000 and DS5000 subsystem devices at this release. If user issues 'pcmpath set device M path N offline' to set last active path offline, this will cause LUN to failover to an alternate controller, and swap its active and passive paths. On a 64bit kernel system, there is a known issue that sometimes this command may also incorrectly cause other LUNs to failover to alternate controller and swap the active and passive paths. If user removes host FC HBA port from DS4000 or DS5000 storage subsystem while application is running, this will cause I/O performance degradation. The correct procedures are: 1. identify the host FC HBA you plan to remove from DS4000 or DS5000 storage subsystem 2. issue 'pcmpath set adapter X offline ap' or issue 'pcmpath set device M path N offline' command to set all the paths that connected to this FC HBA you plan to remove offline. 3. from the DS4000 or DS5000 storage subsystem to remove the FC HBA port. 4. if removing this host FC HBA port is permanent configuration change, make sure you remove this configuration on the host side by issuing either remove adapter or remove path command. =============================================================================== 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. On page 108, the last paragraph of "Installing and upgrading the AIX SDDPCM host attachment" section should be read as: For AIX SDDPCM host attachment installation and upgrade instruction from the CD, see the Host System Attachment Guide for your storage device. Do not reboot the system before SDDPCM package is installed on the system. For AIX SDDPCM host attachment installation and upgrade from the SDD download Web site, use following procedure: 1. Download code from the Web site that is appropriate for your system. 2. Move the downloaded file to the /usr/sys/inst.images directory. 3. Change directory to the /usr/sys/inst.images directory. 4. Untar the downloaded file: for example, tar -xvf devices.fcp.disk.ibm.mpio.rte.tar. 5. Update the .toc file. For example: pwd rm -i .toc inutoc . grep -i devices.fcp.disk.ibm .toc This command should reflect the newer SDDPCM host attachment version that will be uploaded. 6. From your desktop window, enter smitty install_update and press Enter to go directly to the installation panels. The install and Update Software menu is displayed. 7. Highlight Install Software and press Enter. 8. Enter . to indicate the current directory and press Enter. 9. Highlight Software to Install and press F4. The Software to install panel is displayed. 10. Select the devices.fcp.disk.ibm.mpio.rte package 11. Press Enter. The Install and Update from LATEST Available Software panel is displayed with the name of the software that you selected to install. 12. Check the default option settings to ensure that they are what you need. 13. Press Enter to install. SMIT responds with the following message: ARE YOU SURE?? Continuing may delete information you may want to keep. This is your last chance to stop before continuing. 14. Press Enter to continue. The installation process may take a few minutes to complete. 15. When the installation or upgrade is complete, press F10 to exit from SMIT. 16. If this is a host attachment installation, do not reboot the system until you have SDDPCM package installed; if this is host attachment upgrade, and SDDPCM package is already installed on the system, then reboot the system to complete the host attachment upgrade. 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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