IBM(R) Subsystem Device Driver Version 1.5.0.0 README for AIX™ November 25, 2003 --------------------------------------------------------------------------------- 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 SDD 3.0 SDD change history 3.1 Defects Fixed 3.1.1 Common 3.1.2 ESS defects 3.1.3 SVC defects 3.1.4 SVCCISCO 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 Subsystem Device Driver (SDD). This README file contains the most recent information about the IBM Subsystem Device Driver, Version 1 Release 5 Modification 0 Level 0 (SDD 1.5.0.0) for AIX. You should consult the SDD User's Guide to determine if the functionality described here applies to your product environment. See item 2 below. IBM recommends that you go to this Web site to get the most current information about this release of SDD: http://www-1.ibm.com/servers/storage/support/software/sdd.html You should carefully review the following information available through that site: 1. The most current README file. This will contain corrections to the readme file, corrections to the SDD User's Guide, and documentation updates made discovered since this copy of the README was prepared. 2. The SDD Users' Guide. Because SDD can be installed in so many different environments / configurations, detailed information about each environment is placed in the appropriate chapter of the 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 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 intended for storage administrators, system programmers, and performance and capacity analysts. The information in this file only applies to customers who run: 1. ESS or SVC or SVCCISCO 2. ESS and SVC 3. ESS and SVCCISCO 1.2 How to get help Go to the following Web site for SDD technical support and for the most current SDD documentation and support information: http://www-1.ibm.com/servers/storage/support/software/sdd.html Go to the following Web site for the IBM ESS Open Systems support: http://www.storage.ibm.com/hardsoft/products/ess/supserver.htm Go to the following Web site for IBM TotalStorage SAN Volume Controller support: http://www.ibm.com/servers/storage/support/virtual/2145.html Go to the following Web site for IBM TotalStorage SAN Volume Controller for Cisco MDS 9000 support: http://www.ibm.com/servers/storage/support/virtual/2062-2300.html Call one of the following numbers to obtain nontechnical 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 SDD Prior to installing SDD, you should install the latest version of ibm2105.rte. The latest version of ibm2105.rte is 32.6.100.18. --------------------------------------------------------------------------------- 3.0 SDD Change History ================================================================================= 3.1 Defects Fixed 3.1.1 Common 2165 Display error message when user is not running datapath as superuser 2166 querysn program causes cfgdpo and cfallvpath SDD configure methods to coredump 2172 Set broken paths (INVALID state) to CLOSED_DEAD state when vpath is closed, which will speed up HACMP fallover and speed up the time for an application to start. 2176 (mc def 83310) AIX disk driver returns ENXIO when it is not supposed to. AIX APAR IY48995 fixes this problem. SDD will not retry on ENXIO in order to match this aix disk driver fix. 2177 NIM install failed, because SDD migration script does not distinguish the NIM master or NIM client. 2135 Change nls index and message catalog so that lsattr displays the correct ODM attribute description. 2138 (mc def 87292) SDD package migration/upgrade should not interrupt non-SDD devices. 2125 Add -f to stopsrc command to stop sddsrv immediately in order to speed up migration. 92439 Error in manpage for datapath set adapter offline command. The state of the adapter will not change to 'failed' when the datapath set adapter offline command is executed. 3.1.2 ESS defects 2128 (mc defect 86657) SDD will migrate successfully if user migrates from a SDD version which does not support the 2105_max_lun ODM attribute. 3.1.3 SVC defects NONE 3.1.4 SVCCISCO defects NONE ================================================================================= 3.2 New Features 2219 This feature is to allow for a maximum of 1200 ESS LUNS to be configured as vpaths on AIX 5.20 ML1 & up. Note: The maximium number of ESS LUNs supported by ESS is 1000. Although SDD allows you to configure up to 1200 ESS LUNs, it is not officially supported. IBM recommends you to ensure that your host system has enough resource (e.g. memory resource) if you are planning to configure large number of LUNs (e.g. around 1000 LUNs). 2191 Control I/O Flow to SDD devices by dpo 'qdepth_enable' attribute 2175 SDD will issue lun reset command when user opens SDD devices with FORCE mode 2084 Support SAN VC for Cisco MDS 9000 devices. 2119 Display message when MAX LUN configuration is reached. 2127 (PCR 1955) Support man page for datapath command 2113 Support datapath query wwpn (World Wide Port Name) to display the World Wide Port Name (wwpn) of the host fiber adapters Example: [root@cracker]> datapath query wwpn Adapter Name PortWWN fscsi0 10000000C925F5B0 fscsi1 10000000C9266FD1 2114 (PCR 2325) Support scsi-3 lun_reset cmd for ESS device. A new ESS device ODM attribute of "lun_reset_spt" is added, and the default value is set to 'yes' to enable this cmd support. From aix 51D and up, SDD supports a new device openx ext_flag -- SC_FORCED_OPEN_LUN. 2085 Support FC Dynamic Device Tracking and Fast I/O Failure of FC Devices for AIX 5.20 ML1 and up ================================================================================= 3.3 Feature Details 2191 Starting with SDD version 1.5.0.0, a new SDD attribute, qdepth_enable, allows you to control I/O flow to SDD vpath devices. By default, SDD uses the device queue_depth setting to control the I/O flow to SDD vpath device and paths. With certain database applications, such as an application running with a DB2 database, Lotus Notes ® , or Informix ® database, the software might generate many threads, which can send heavy I/O to a relatively small number of devices. Executing queue depth logic to control I/O flow can cause performance degradation, or even a system hang. If you are executing queue depth logic , use the qdepth_enable attribute to disable this queue depth logic on I/O flow control. This removes the limit on the amount of I/O sent to vpath devices. By default, the queue depth logic to control the amount of I/O sending to the vpath devices is enabled in SDD driver. To determine if queue depth logic is enabled on your system, run the following command: >lsattr -El dpo 2062_max_luns 512 Maximum LUNS allowed for 2062 False 2105_max_luns 1200 Maximum LUNS allowed for 2105 True 2145_max_luns 512 Maximum LUNS allowed for 2145 False persistent_resv yes Subsystem Supports Persistent Reserve Command False qdepth_enable yes Queue Depth Control True To disable queue depth logic, you should change the qdepth_enable attribute setting in ODM by executing chdev. The following procedures are examples for different SDD configuration conditions: If vpaths are already configured on the system, use the following procedure to change the value of the qdepth_enable attribute (in this case, from yes to no): 1. Execute rmdev -l dpo -R. 2. Execute chdev -l dpo -a "qdepth_enable=no". 3. Execute lsattr -El dpo to verify qdepth_enable attribute is changed. For example: >lsattr -El dpo 2062_max_luns 512 Maximum LUNS allowed for 2062 False 2105_max_luns 1200 Maximum LUNS allowed for 2105 True 2145_max_luns 512 Maximum LUNS allowed for 2145 False persistent_resv yes Subsystem Supports Persistent Reserve Command False qdepth_enable no Queue Depth Control True 4. Execute ’cfallvpath’ to configure the vpaths. If vpaths are not configured on the system, to change the qdepth_enable value from yes to no: 1. Execute /usr/lib/methods/defdpo. 2. Execute chdev -l dpo -a "qdepth_enable=no". 3. Execute lsattr -El dpo to verify qdepth_enable attribute is changed. >lsattr -El dpo 2062_max_luns 512 Maximum LUNS allowed for 2062 False 2105_max_luns 1200 Maximum LUNS allowed for 2105 True 2145_max_luns 512 Maximum LUNS allowed for 2145 False persistent_resv yes Subsystem Supports Persistent Reserve Command False qdepth_enable no Queue Depth Control True 4. Execute ’cfallvpath’ to configure the vpaths. Note: These procedures are disruptive. If you are planning to run an application that will generate a large amount of I/O, you should perform the above procedures to disable the queue depth logic before you start the application. 2085 Support FC Dynamic Device Tracking and Fast I/O Failure of FC Devices for AIX 5.20 ML1 and up AIX has added an attribute named fc_err_recov in AIX 5.20 ML1 to enable fast failover during error recovery. If enabled, this attribute can reduce the amount of time SDD takes to fail a broken path. By default, this attribute is set to "delayed_fail". To enable fast failover, you must do the following: 1. Change all the children devices of fscsiX on your system to the defined state by running the command 'rmdev -l fscsiX -R' for all adapters on your system. 2. Run the command 'chdev -l fscsiX -a fc_err_recov=fast_fail' for all adapters on your system. 3. Run cfgmgr to reconfigure all devices back to the available state. In order to use dynamic tracking with SDD, you must have ibm2105.rte version 32.6.100.16 or later installed on your AIX 5.20 ML1 system. You need to have the following Fibre Channel device driver APARs applied to your system in order to have all dynamic tracking and fast fail fixes: IY37183 Dynamic Tracking and Fast I/O Failure of Fibre Channel Devices IY44139 Dynamic Tracking: PERM I/O errors after Host HBA Cable Pull IY44142 Dynamic Tracking: I/O Hang after Host HBA Cable Pull IY44342 Dynamic Tracking: Ioctl call may fail after N_Port ID Change IY44344 Dynamic Tracking: Back-to-Back Cable Move May Delay Error Recov IY45368 Fast Fail/Dynamic Tracking: FC Device Inaccesible after Move IY46701 Dynamic Tracking & MPIO: Multiple Cable Swap Cause Path Failure Dynamic Tracking support allows for the following scenarios without I/O errors or loss of access: 1. Combine two switches in two different SANS into one SAN by connecting the switches with a cable and cascading the switches. 2. Change the Shark FC cable from one switch port to a different switch port; Disconnected cable must be reconnected within 15 seconds. 3. Swap two Shark FC cables on the switch ports; Disconnected cables must be reconnected within 15 seconds. 4. Swap two Shark FC cables on the shark ports; Disconnected cables must be reconnected within 15 seconds. Note: FC device dynamic tracking does not support the case that the port change on the Shark means that a cable is moved from one adapter to another free, previoulsy-unseen adapter on the Shark. The reason is that the WWN will be different for that adapter, so we won't be able to track it. The under lying assumption is the WWN is a static identifier of a remote port. AIX has added a new attribute which must be changed to enable dynamic tracking. By default, dynamic tracking is disabled. To enable this feature, you must do the following: 1. Change all the children devices of fscsiX on your system to the defined state by running the command 'rmdev -l fscsiX -R' for all adapters on your system. 2. Run the command 'chdev -l fscsiX -a dyntrk=yes' for all adapters on your system. 3. Run cfgmgr to reconfigure all devices back to the available state. For more information on Dynamic Tracking and Fast I/O Failure, see the AIX release notes at http://publib.boulder.ibm.com/pseries/aixgen/relnotes/52RELNOTES/10073902.htm Installing APAR IY37183 also installs the file /usr/lpp/bos/README.FIBRE-CHANNEL which has more information on these AIX features. ================================================================================= 3.4 Known Issues NONE ================================================================================= 3.5 Correction to User's Guide Addendum to sub-section entitled 'Determining whether system has enough resource for increasing the maximum number of ESS LUNs' on page 27: With a large number of LUNs, many special device files will be created in the /dev directory. Executing the "ls" command with a wildcard (*) in this directory may fail. To fix this, you will need to change the ncargs attribute of sys0. The ncargs attribute controls the ARG/ENV list size in 4K byte blocks. The default value for this attribute is 6 (24K), and the maximum value for this attribute is 128 (512K). We suggest that you increase the value of this attribute to 30. If you still experience failures after changing the value to 30, you should increase this value to a larger number. Changing the ncargs attribute is dynamic. Use the following command to change the ncargs attribute to 30: chdev -l sys0 -a ncargs=30 Page 86 of the SDD User's Guide incorrectly states executing the querysn command with the -d flag will delete the entire contents of the /etc/vpexclude file, so that no devices will be excluded from the SDD configuration. Executing the querysn command with the -d flag deletes all existing contents from this exclude file and then writes the new serial number into the file. --------------------------------------------------------------------------------- 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. The Program and Documentation is owned by International Business Machines Corporation or one of its subsidiaries (IBM) or IBM suppliers, and is copyrighted and licensed, not sold. IBM does not transfer title to this Program and Documentation to you. 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