IBM(R) Multipath Subsystem Device Driver Path Control Module (PCM) GA Version 2.5.1.0 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 1 Level 0 (SDDPCM 2.5.1.0) 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 8. DS3950 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 and DS5000 storage devices and a new ESS/SVC/DS6K/DS8K storage device attribute - 'retry_timeout': ESS/DS8000/DS6000/SVC/DS4000/DS5000/DS5020/DS3950: devices.fcp.disk.ibm.mpio.rte (version 1.0.0.20) 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/DS3950 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) 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 TL09 IZ60980 AIX53 TL11 IZ59403 AIX61 TL01 IZ63619 AIX61 TL02 IZ63447 AIX61 TL03 IZ63238 AIX61 TL04 IZ59305 sddpcm 2.5.0.1 or higher supports ESS/DS8000/DS6000/SVC/DS4000/DS5000/DS5020 storage devices. It requires the following AIX disk driver/VIOS release ifix if the storage system is in VIO configuration environment: AIX Level APAR AIX53 TL08 IZ63805 IZ57627 IZ46640 AIX53 TL09 IZ63806 IZ59656 IZ46070 AIX53 TL10 IZ63807 IZ53813 IZ44846 AIX53 TL11 IZ63808 IZ56557 IZ44851 AIX61 TL01 IZ63810 IZ58076 IZ42057 AIX61 TL02 IZ63811 IZ57549 IZ42029 AIX61 TL03 IZ63812 IZ57216 IZ44323 AIX61 TL04 IZ63813 IZ56859 IZ44417 VIOS Level APAR VIOS 1.5.2.5-FP-11 SP-01 IZ61662 (NOT for DS4000/DS5000/DS5020) VIOS 2.1.1.10-FP-21 IZ62591 (NOT for DS4000/DS5000/DS5020) 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 If not available for download, contact AIX software support to determine eligibility for a temporary fix. sddpcm 2.5.1.0 or higher supports ESS/DS8000/DS6000/SVC/DS4000/DS5000/DS5020/DS3950 storage devices. It requires the following AIX releases and ifix if system has SAN BOOT configuration with DS4000/DS5000/DS5020/DS3950 devices: AIX Level APAR AIX53 TL08-00 IZ66557 AIX53 TL09-06 IZ69197 AIX53 TL10-03 IZ69238 AIX53 TL11-01 IZ59764 AIX53 TL12-01 AIX61 TL03-03 IZ60317 AIX61 TL04-01 IZ59788 AIX61 TL05-01 VIOS Level VIOS 2.1.1.10-FP-22.1 includes above AIX APAR (NOT for DS4000/DS5000/DS5020/DS3950) If you are running AIX53, and you want to configure SANBOOT with DS4000/DS5000/ DS5020/DS3950 devices, please contact IBM AIX software support. Following AIX ifix is required if DS3950 storage devices are configured: AIX Level APAR AIX53 TL10 SP01 IZ65660 AIX61 TL03 SP01 IZ65658 Note: Please contact IBM AIX support team for the APARs not listed above in order to support DS4K/5K as SAN BOOT disks. 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 sometime causes 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/5K devices, it is caused by referring an invalid controller id. 4608 lscfg cannot display the Serial Number of DS4K/5K hdisks 4610 (PMR53971,842,758) relbootrsv fails to release reserve if scsi-2 reserve was issued by non first path of a 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 4624 SDDPCM FCP and SAS Host Attachments are not NIM compliant 4627 lspcmcfg print wrong message because the dependency on HA pkg 4661 System crash when removing DS5020 and DS5K hdisks 4662 Check Condition with 05/94/01 sense code sometime caused I/O failure 4671 Handle reservation conflict condition with single path or one enabled path. 4682 rmdev DS4K/5K device may crash the system, caused by SDD trace reference invalid controller id 4684 (PMR09522)Fail to open PPRC secondary LUN due to persistent reserve out command hit reservation conflict 4685 (PMR73548)SDDPCM should fail pcmSelectIoctlPath call if the path is brain dead 4686 (AIX defect 718997) Healthchecker is disabled if single path is configured. =============================================================================== 3.2 New Features 2.4.0.5 --------- 4585 Add a new device attribute - 'retry_timeout', which sets the timeout value for I/O retry on last path. 2.5.0.0 --------- 4546 Add a new command 'lspcmcfg' to display SDDPCM device information 4556 Add DS5020 new device model support 2.5.1.0 --------- 4666 Add DS3950 new device model support 4676 Support DS4K/5K devices as SAN BOOT disks and the AIX 'manage_disk_drivers' tool to switch drivers for DS4K/5K storage devices. Note: This function requires certain AIX APARs to be installed on the system. APAR information for different AIX OS or TL is listed above under 'Prerequisites for SDDPCM' section. =============================================================================== 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 under 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/DS5000/DS5020/DS3950 active/passive storage devices, you should use 'ap' parameter to indicate this is an adapter connected to DS4000/ DS5000/DS5020/DS3950 storage 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, and/or DS5020, and/or DS3950 LUNs fail over to an alternate controller, this command is only supported when the AIX server has one DS4000, or DS5000, or DS5020, or DS3950 storage subsystem configured. This command may not work correctly if you have more than one storage subsystem devices configured on an AIX server, and 'set adapter offline ap' command will cause multiple subsystems migrating from one controller to an alternate controller. Please refer to SDD User's Guide, chapter 3 for detail information of this command. If user removes host FC HBA port from DS4000, DS5000, DS5020, or DS3950 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, DS5000, Ds5020, or DS3950 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, DS5000, DS5020, or DS3950 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. VIOS is not supported with SDDPCM on DS4000/DS5000/DS5020 subsystem devices. =============================================================================== 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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