IBM(R) Multipath Subsystem Device Driver Path Control Module (PCM) GA Version 2.6.0.0 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 6 Modification 0 Level 0 (SDDPCM 2.6.0.0) 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 8. DS3950 9. IBM BladeCenter S SAS RAID Controller Module 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 attachment for SDDPCM to support DS4000, DS5000, DS5020 and DS3950 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 1.0.0.21) You must install the following host attachment for SDDPCM to support IBM BladeCenter S SAS RAID Controller Module on JS12, JS22, JS23, and JS43 blades. IBM BladeCenter S SAS RAID Controller Module: devices.sas.disk.ibm.mpio.rte(version 1.0.0.0) 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) Note: VIOS is not supported with SDDPCM on DS4000/DS5000/DS5020/DS3950 subsystem devices. 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 TL10-01 IZ65660 AIX61 TL03-01 IZ65658 The AIX APARs are available from AIX fix central website: http://www-912.ibm.com/eserver/support/fixes/fixcentral/main/pseries/aix Note: Please contact IBM AIX support team for the APARs not listed above in order to support DS4000/DS5000/DS5020/DS3950 devices as SAN BOOT disks. sddpcm 2.6.0.0 or higher support ESS/DS8000/DS6000/SVC/DS4000/DS5000/DS5020/DS3950/ IBM BladeCenter S SAS RAID Controller Module storage devices. It requires the following AIX releases and ifix if system(JS12/J22/JS23/JS43) has IBM BladeCenter S SAS RAID Controller Module devices configured: AIX Level APAR AIX61 TL03-02 IZ68569, IZ62617, IZ68572, IZ70078 AIX61 TL04-01 IZ68571, IZ68574, IZ70079 For VIO servers: sddpcm 2.6.0.0 or higher supports VIO Servers connected to IBM BladeCenter S SAS RAID Controller Module devices. Please contact IBM AIX support team for the appropriate VIOS level --------------------------------------------------------------------------- 3.0 SDDPCM change history =============================================================================== 3.1 Defects Fixed 4722 (AIX defect 736797)Need to synchronize device cfg/uncfg with pcmsrv device interface calls to prevent system crashing. 4723 pcmsrv checking trace buffer interval is reduced from 5 seconds to 1 second to prevent loosing trace data. 4727 smit mpio change path function fails on Active/Active storage devices. ========================================================================================== 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 DS4000/5000/DS5020/DS3950 devices as SAN BOOT disks and the AIX 'manage_disk_drivers' tool to switch drivers for DS4000/5000/DS5020/DS3950 storage devices configuration. 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. 2.5.2.0 --------- 4713 Support DS4K and DS5K family device controller health check function 4721 Add two new pcmpath commands to allow dynamically change controller health check attributes 2.6.0.0 --------- 4573 Support 'pcmpath query wwpn' command to display SAS adapter WWPN 4717 Support IBM BladeCenter S SAS RAID Controller Module R2.1 GA 4713 Support DS4K and DS5K family device controller health check function 4721 Add two new pcmpath commands to allow dynamically change controller health check attributes =============================================================================== 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. 4713 This feature is for Active/Passive storage devices, which includes DS4K and DS5K family of devices. This controller health check function, when enabled, will be invoked when an enabled path become unavailable due to transport problems. Enabling this feature results in faster I/O failure time when the access to a LUN is lost. The faster failure time is controlled by one of the controller health check attriubte - cntl_delay_time setting. By default, this feature is DISABLED. To enable this feature, user needs to set following two ODM attributes to non-zero value for the active/passive storage devices: cntl_delay_time: is the amount of time in seconds the storage device's controller(s) will be health checked after a transport failure. At the end of this period, if no paths are detected as good, then all pending and subsequent I/O to the device will be failed, until the device health checker detects a failed path has recovered. cntl_hcheck_int: The first controller health check will only be issued after a storage fabric transport failure had been detected. cntl_hcheck_int is the amount of time in seconds, which the next controller health check command will be issued. This value must be less than the cntl_delay_time (unless set to "0", to disable this feature). NOTE: Setting either value to "0" disables this feature. Setting cntl_delay_time to '1' also disables this feature For example, if you wish to allow the storage device within 30 seconds to come back on the fabric(after leaving the fabric), then you can set cntl_delay_time=30 and cntl_hcheck_int=2. The device, /dev/hdisk#, must not be in use, when setting the ODM values with 'chdev' command(or the chdev "-P" option must be used, which requires a reboot to make the change to take effect). CAUTION: There are cases where the storage device may reboot both of the controllers and become inaccessible for a period of time. If the controller health check feature is enabled, and 'cntl_delay_time' is set too short, then this may result in an I/O failure. It is recommended to make sure you have an mirrored volume to failover to, or with GPFS configuration if you are running with controller health check enabled and cntl_delay_time setting is under 60 seconds, or is not long enough to cover the temporary device inaccessible conditions, which may occur during the storage concurrent code load operation or other error injection operations. 4721 This feature allows user to change both controller health check ODM attributes dynamically (using 'chdev' command requires unconfigure/reconfigure device). pcmpath set device cntlhc_interval The pcmpath set device cntlhc_interval command dynamically changes the Active/Passive MPIO device controller health check time interval or disables this feature. Syntax pcmpath set device [num2] cntlhc_interval Parameters num1 [ num2 ] * When only num1 is specified, then the command applies to the hdisk specified by num1. * When 2 device logical numbers are entered, this command applies to all the Active/Passive devices whose logical numbers fit within the range of the two device logical numbers. t The range of supported values for controller health check time interval is 0-300 seconds. Setting the value to 0 will disable this feature. Examples If you enter pcmpath set device 2 10 cntlhc_interval 3, the controller health check time interval of hdisk2 to hdisk10 is immediately changed to 3 seconds, if hdisk2 to hdisk10 are all Active/Passive devices. pcmpath set device cntlhc_delay The pcmpath set device cntlhc_delay command dynamically changes the Active/Passive MPIO device controller health check delay time or disables this feature. Syntax pcmpath set device [num2] cntlhc_delay Parameters num1 [ num2 ] * When only num1 is specified, then the command applies to the hdisk specified by num1. * When 2 device logical numbers are entered, this command applies to all the Active/Passive devices whose logical numbers fit within the range of the two device logical numbers. t The range of supported values for controller health check delay time is 0-300 seconds. Setting the value to 0 will disable this feature. Examples If you enter pcmpath set device 2 10 cntlhc_delay 30, the controller health check delay time of hdisk2 to hdisk10 is immediately chnaged to 30 seconds, if hdisk2 to hdisk10 are all Active/Passive devices. Note: If cntl_delay_time is set to '1', this will disable the controller health check feature, just like set it to '0'. If user tries to set cntl_hcheck_int with a value larger than cntl_delay_time, then cntl_hcheck_int will be set to the same value as cntl_delay_time. If user tries to set cntl_delay_time with a value smaller than cntl_hcheck_int, the command will fail with INVALID parameter. ====================================================================================== 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 device models configured on an AIX server, and 'set adapter offline ap' command may 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. VIOS is not supported with SDDPCM on DS4000/DS5000/DS5020/DS3950 subsystem devices. 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 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 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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You may use the copy only to replace the original, when necessary; and 3. execute and display the Code as necessary to maintain the Specific Machine. You agree to acquire any replacement for, or additional copy of, Code directly from IBM in accordance with IBM's standard policies and practices. You also agree to use that Code under these terms. You may transfer possession of the Code to another party only with the transfer of the Specific Machine. If you do so, you must 1) destroy all your copies of the Code that were not provided by IBM, 2) either give the other party all your IBM-provided copies of the Code or destroy them, and 3) notify the other party of these terms. IBM licenses the other party when it accepts these terms. These terms apply to all Code you acquire from any source. Your license terminates when you no longer rightfully possess the Specific Machine. Actions you must not take You agree to use the Code only as authorized above. You must not do, for example, any of the following: 1. Otherwise copy, display, transfer, adapt, modify, or distribute the Code (electronically or otherwise), except as IBM may authorize in the Specific Machine's Specifications or in writing to you; 2. Reverse assemble, reverse compile, or otherwise translate the Code unless expressly permitted by applicable law without the possibility of contractual waiver; 3. Sublicense or assign the license for the Code; or 4. Lease the Code or any copy of it. ------------------------------------------------------------------------------- 6.0 Trademarks and service marks The following terms are trademarks of the International Business Machines Corporation in the United States,other countries, or both: AIX AS/400 Enterprise Storage Server HACMP/6000 IBM IBM logo iSeries Netfinity NetVista Operating System/400 pSeries RS/6000 Seascape SP System/360 System/370 System/390 The eServer logo TotalStorage Versatile Storage Server xSeries zSeries z/Architecture z/OS Microsoft, Windows, Windows NT, and the Windows logo are registered trademarks of Microsoft Corporation. Java and all Java-based trademarks are trademarks of Sun Microsystems, Inc. in the United States, other countries, or both. UNIX is a registered trademark of The Open Group in the United States and other countries. Other company, product, and service names may be trademarks or service marks of others. ------------------------------------------------------------------------------- (C) Copyright IBM Corporation 2000, 2002, 2003, 2004. All rights reserved.