IBM(R) Multipath Subsystem Device Driver Path Control Module (PCM) GA Version 2.5.0.0 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 5 Modification 0 Level 0 (SDDPCM 2.5.0.0) 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 7. DS5020 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 fileset "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, along with the SDD package. The SDD driver and SDDPCM module can not coexist on one server. You must install the following host attachments for SDDPCM to support DS4000, DS5000 and DS5020 storage devices and a new device attribute for ESS/SVC/DS6K/DS8K storage - 'retry_timeout': ESS/DS8000/DS6000/SVC/DS4000/DS5000/DS5020: devices.fcp.disk.ibm.mpio.rte (version 1.0.0.18) 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/DS5000/DS5020 subsystem devices. sddpcm 2.2.0.3 or higher supports ESS/DS8000/DS6000/SVC storage devices. It requires the following AIX and VIOS releases if you are running SVC release v4.2.1.6 and above that supports LONG BUSY function: AIX Level AIX52 TL10-07 AIX53 TL06-09 AIX53 TL07-06 AIX53 TL08-04 AIX61 TL00-07 AIX61 TL01-03 AIX61 TL02-00 VIOS Level 1.5.2.5-FP-11.1 SP-01 and above sddpcm 2.4.0.0 or higher supports ESS/DS8000/DS6000/SVC/DS4000/DS5000 storage devices. It requires the following AIX and VIOS releases: AIX Level AIX53 TL06-10 AIX53 TL07-07 AIX53 TL08-05 AIX53 TL09-00 AIX61 TL00-08 AIX61 TL01-04 AIX61 TL02-00 VIOS Level 1.5.2.5-FP-11.1 SP-01 and above (NOT for DS4000 or DS5000) VIOS Level 2.1.0.10-FP-20.1 and above (NOT for DS4000 or DS5000) sddpcm 2.4.0.3 or higher supports ESS/DS8000/DS6000/SVC/DS4000/DS5000 storage devices. It requires the following AIX and VIOS releases: AIX Level APAR AIX53 TL08 IZ48395 AIX53 TL09 IZ52471 AIX53 TL10 IZ54856 AIX53 TL11 IZ50064 AIX61 TL00 IZ54857 AIX61 TL01 IZ54858 AIX61 TL02 IZ49639 AIX61 TL03 IZ52470 AIX61 TL04 IZ49804 VIOS Level 1.5.2.5-FP-11.1-SP-01 (NOT for DS4000 or DS5000) VIOS Level 2.1.0.10-FP-20.1 and above (NOT for DS4000 or DS5000) VIOS Level 2.1.1.10-FP-21 and above (NOT for DS4000 or DS5000) Please check the AIX fix central website for fix availability: http://www-912.ibm.com/eserver/support/fixes/fixcentral/main/pseries/aix For VIO servers: http://www14.software.ibm.com/webapp/set2/sas/f/vios/home.html sddpcm 2.5.0.0 or higher supports ESS/DS8000/DS6000/SVC/DS4000/DS5000/DS5020 storage devices. It requires the following AIX releases: AIX Level APAR AIX53 TL08 IZ61318 AIX53 TL09 IZ61136 AIX53 TL10 IZ60980 AIX53 TL11 IZ59403 AIX61 TL01 IZ63619 AIX61 TL02 IZ63447 AIX61 TL03 IZ63238 AIX61 TL04 IZ59305 Note: Please contact IBM AIX support team for the APARs not listed above. 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 4560 incorrect adapter state after set adapter offline and close some devices. 4562 Handle DS8K check condition with sense code of B/25/0. This fix requires AIX defect 696938 fix applied 4563 2107 disk access failed in GPFS cluster using persistent reserve policy with AIX53 and above 4564 Additional fix for displaying LUN size with capacity equals or larger than 2TB 4565 removing DS4K/5K devices may cause system crash 4572 Pull off all cables or disable all ports causing I/O hanging with DS4K/5K devices 4575 (PMR34211) improve the error handling of cascading timeout condition not otherwise handled by adapter/switch interactions 4578 Display DS5K models generically as DS5000 4579 I/O hung on DS4K/5K devices if paths failed with reservation conflict 4581 I/O failed on Active/Active devices if only one path is left 4586 (PMR59533) System crashed with Round Robin after path/adapter is removed. 4594 system may crash if repeatly config/unconfig DS4K/DS5K devices, it is caused by referring an invalid controller id. 4606 SDDPCM packaging should not require both FCP HA and SAS HA be installed 4608 lscfg cannot display the Serial Number of DS4K/DS5K hdisks 4609 lspcmcfg needs to support RSSM devices 4610 (PMR53971) relbootrsv fails to release reserve if scsi-2 reserve was issued by non first path of a device 4611 Fix RSSM inquiry 0x83 size for lunid checking 4612 Update pcmpath usage for RSSM device 4613 Disable all DS4K/5K ports causing I/O hanging 4614 Query port shows incorrect number of paths 4615 Need to add a symbolic link of /usr/sbin/pcmpath as /usr/sbin/datapath 4616 Use 'oslevel -s' in sddpcmgetdata 4619 Query port/portstats and lbp path selection algorithm are not supported for RSSM devices =============================================================================== 3.2 New Features 4585 Add a new device attribute - 'retry_timeout', which set the timeout value for I/O retry on last path. 4546 Add a new command 'lspcmcfg' to display SDDPCM device information 4556 Add DS5020 new device model support 4573 Support 'pcmpath query wwpn' command to display SAS adapter WWPN =============================================================================== 3.3 Feature/defect Details 4585 Starting from v2.4.0.3, a new device attribute - 'retry_timeout' is added for ESS/DS6K/DS8K/SVC devices. This attribute allows user to set the timeout value for I/O retry on the last path. The default value of this attribute is 120 seconds and it is user-changeable with the valid range of 30 to 600 seconds. pcmpath provides a new CLI command to dynamically change this device retry_timeout attribute. The syntax of this command: pcmpath set device /( ) retry_timeout This feature enables user to adjust the timeout value to control how long SDDPCM will retry the I/O on last path before it fails to the application. In the situation where a device access is lost on all the paths permanently and command fails with TIMEOUT error, which takes rw_timeout time to fail a command. By setting retry_timeout value to default (120 seconds) or smaller value, this feature enables fast path failure and avoids I/O hanging problem in this condition. In the situation where a device loss of access is only temporary, the retry_timeout value may need to be set to a larger value. For example, during certain storage concurrent code download or storage warmstart, it is possible that all the paths to a device may lost access for a short period of time temporarily, such as from a few seconds to a few minutes. Under such situation, I/O should be retried on the last path for an extended period of time to prevent failing the I/O back to application. This will open the window for path recovery from temporary errors. =============================================================================== 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 is a known AIX disk driver configuration issue, which fails the migration of DS4000 or DS5000 subsystem devices from AIX native mpio devices to SDDPCM mpio devices. Therefore, the SAN boot function is not supported with DS4000 and DS5000 subsystem devices right now, until the AIX disk driver configuration problem is resolved. VIOS is not supported with SDDPCM on DS4000 and DS5000 subsystem devices. 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 a 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 127 the description of section "Starting the SDDPCM server manually" should be read as: If pcmsrv did not start automatically after you performed the SDDPCM Installation and configured supported storage devices, you can start pcmsrv by entering: startsrc -s pcmsrv -e "XPG_SUS_ENV=ON" On Page 127 the description of section "Stopping the SDDPCM server" should be read as: However, in certain cases when you want to permanently (not to start even after a system restart) disable pcmsrv, you must comment out the following line in the system init table (/etc/inittab): srv:2:wait:/usr/bin/startsrc -s pcmsrv -e "XPG_SUS_ENV=ON" > /dev/null 2>&1 On page 102 "Unsupported SDDPCM feature" section, "HACMP and VIO are not supported...." statement should be read as: VIO is not supported with DS4000 and DS5000 storage subsystems. 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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