IBM(R) SUBSYSTEM DEVICE DRIVER 1.3.0.8 README FOR SUN --------------------------------------------------------------------------- CONTENTS 1.0 About this README file 1.1 Who should read this README file 1.2 How to get help 2.0 SDD defects and fixes 2.1 Defect Details 3.0 Known problems and workarounds 3.1 Known problem and workaround 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 Subsystem Device Driver (SDD). This README file contains the most recent information about the IBM Subsystem Device Driver, Version 1 Release 3 Modification 0 Level 8 (SDD 1.3.0.8) for SUN. IBM recommends that you print and review the contents of this README file and the Subsystem Device Diver User’s Guide before installing and using SDD. You can find the most current documentation and support information on the Web site: www.ibm.com/storage/support/techsup/swtechsup.nsf/support/sddupdates/ 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 ESS. 1.2 How to get help 1. Go to the following Web site for SDD technical support: ssddom01.storage.ibm.com/techsup/swtechsup.nsf/support/sddsupport/ 2. Go to the following Web site for the most current SDD documentation and support information: www.ibm.com/storage/support/techsup/swtechsup.nsf/support/sddupdates/ 1.3 Go to the following Web site for the IBM ESS Open Systems support: www.storage.ibm.com/hardsoft/products/ess/supserver.htm 1.4 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 SDD defects and fixes The following table lists the defects that are corrected in this release. Note: The defect numbers listed in the table are for IBM internal reference use only. (mc = microcode family in CMVC / sw = software family in CMVC) ================================================================ Defect# Description (mc/sw) ================================================================ 1291 Fixes "Solaris system hung when I/O initiated by LVM without opening a device" 56257 Fixes "Copyright wrong in vpathdd.conf New copyright for IBM information is reflected in vpathdd.conf." 2.1 Defect details The following section provides additional information, as applicable, about the defects listed previously. ================================================================ Defect # Details ================================================================ There are no additional information about the defects listed previously. --------------------------------------------------------------------------- 3.0 Known problems and workarounds The following table lists the known problems and recommended workarounds for this release of the Subsystem Device Driver: ================================================================ Item Description ================================================================ 1. Patch 108968-02 causes the volume manager to hang in the middle of mounting the Subsystem Device Driver CD on a Sun server running Solaris 8. 2. Message, "Warning: Failed process interrupt for vpathdd0 due to down-rev nexus driver Pseudo0" (This message shows up during the installation and reboot time on Solaris 8 only.) 3. Failback for Subsytem Device Driver on Solaris 3.1 Known problem and workaround details The following section provides additional information, as applicable, about the known problems and workarounds listed previously. ================================================================ Details ================================================================ 1. The patch 108968-02 causes the volume manager to hang in the middle of mounting the Subsystem Device Driver CD. "Installing the Subsystem Device Driver CD on a Sun server running Solaris 8 patch 108968-02" We recommend that you upgrade Solaris 8.0 to the latest accumulative patches, 108528-08 and beyond. Or, use the following procedure as a workaround if you do not have the latest patches installed, and in the event that Subsystem Device Driver CD installation process fails when installing on a Sun server running Solaris 8 patch 108968-02. Perform the following steps: 1. Stop volume manager by typing this command: /etc/init.d/volmgt stop 2. Insert the CD in the CDROM 3. Manually mount by typing this command: mount -F hsfs -o ro /dev/dsk/cxtydzs0 /mnt (where cxtydzs0 is the special file for the CDROM in the intend server) 4. Install the package by typing either one of the following commands: For 32-bit applications, type: pkgadd -d /mnt/sun32bit IBMdpo For 64-bit applications, type: pkgadd -d /mnt/sun64bit IBMdpo 5. Unmount the CD by typing this command: umount -a /mnt 6. Remove the CD by typing this command: eject /dev/dsk/cxtydz 7. Restart the volume manager by typing this command: /etc/init.d/volmgt start ============================================================================================= Details ============================================================================================= 2. Message, "Warning: Failed process interrupt for vpathdd0 due to down-rev nexus driver Pseudo0" This message shows up during the installation and reboot time on Solaris 8 only. This message will not impact the normal Subsystem Device Driver installation and operation because the VPATHDD device driver does not require interrupt handling by the underlying PSEUDO nexus device driver. The VPATHDD device driver interrupts are the same as the underlying SCSI HBA interrupts, which are generated through the hardware bus, such as, the PCI and SBUS, and handled by the corresponding PCI or SBUS nexus device driver. Hence, it does not require any handling through PSEUDO nexus device driver. ============================================================================================= Details ============================================================================================= 3. Failback for Subsytem Device Driver on Solaris Raw Device Behavior ------------------- This section discusses the behavior when using the raw device or the block vpath device in a way such that it is not being used as a mounted file system. For example, by issuing a dd command directly to the char or block device. The Sun operating system will issue an OPEN to the device when the device is used. There are times when the operating system recognizes that the device is OPEN, and will not pass though further OPENS and CLOSES, until it recognizes the CLOSE as being the last CLOSE. Moreover, this operating system regards the block device and the character device as separate devices. It can also send multiple OPENS to devices that are already OPEN. Normal Usage usage of a disk ---------------------------- The normal usage of a disk would be to build a file system on the disk, and use the block device to mount a file system at boot time. This will cause an OPEN to be issued at mount time and then no more OPENS or CLOSES on the block device will occur until the file system is unmounted, which would normally be at system shutdown. The file system will not pass through multiple OPENS and CLOSES on an OPEN file system device. Recovery on a file system within the vpath driver is based on an automated, but finite number of periodic retries, and after a certain point, the vpath driver will give up and wait for a manual recovery command to be issued. For example, by issuing the command, datapath set adapter nn online. When a path is lost for a long period, it can be inefficient to keep trying since some retries may take several seconds to time out, and no I/O can be performed during that time. The other way that recovery can happen is by performing OPENS and CLOSES. Performing an OPEN under the Subystem Device Driver will try to OPEN all paths to all underlying devices, irrespective of the state of the device. If the OPEN fails it will mark the path DEAD unless the path is in an OPEN state. Similarly a CLOSE that is the last CLOSE (no one else has the device OPEN) will set the path to a CLOSED state, irrespective of whether the device is DEAD or OPEN. Behaviors --------- 1. Character Only access. On a device that is being used for character I/O, such as Database Access, if OPENS are happening frequently, the path recovery will be quick after a path has become available, since the next OPEN issued will set the device to OPEN immediately. This then, depending on how long it is OPEN, and how much I/O occurs, does not necessarily go through the limited retry mechanism, but will typically, if there are frequent OPENs, the recovery will occur automatically and much quicker. Note: When a path is lost for a long period, it can be inefficient to keep trying since some retries may take several seconds to time out, and no I/O can be performed during that time. 2. Mounted File System Device (even the behavior of a permanently OPENED block device is affected by direct device access). Any command that uses the vpath device bypassing the file system, will issue an OPEN. The most common way is a command that sends an ioctl to the device such as, the Sun format command. This command issues an ioctl to the character device, which will cause the device to be OPENED. At this point, recovery can happen, even if the device was DEAD but it is now available, its status will be set to OPEN, and usage will start immediately, but with one exception; The exception is, when the device is a mounted file system, when it is already OPEN, and it is in the middle of an automatic recovery cycle. The recovery may have to wait up to 2000 selects on the good paths before it retries the other path. So running a command such as, the Sun format command can be used for recovery, instead of using the command, datapath set adapter nn online. ------------------------------------------------------------------------------------------------------ 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. The terms of this Agreement apply to any additional license copy of the Program or Documentation that IBM authorizes you to make. The term "Program" means the original program and all whole or partial copies of it, including portions merged with other programs. A Program consists of machine-readable instructions and related license materials. Under this Agreement, IBM provides you with a license to use the Program and Documentation only. 4.1 Background/Purpose IBM provides certain device drivers and Documentation under this Agreement. 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Which specific IBM devices the Program and Documentation are to be used with: IBM devices:IBM Enterprise Storage Server™ (ESS) 2. For what specific server platforms the Program and Documentation are to be used on and for what software requirements apply to the use of the Program and Documentation reference the ESS Open Systems Support Web page,located at: www.storage.ibm.com/hardsoft/products/ess/supserver.htm CONTINUING WITH THIS INSTALLATION CONSTITUTES YOUR ACCEPTANCE OF THE TERMS OF THE ABOVE 'USER LICENSE AGREEMENT FOR IBM DEVICE DRIVERS' --------------------------------------------------------------------------- 5.0 Notices This information was developed for products and services offered in the U.S.A. IBM may not offer the products, services,or features discussed in this document in other countries. Consult your local IBM representative for information on the products and services currently available in your area. 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