IBM(R) System Storage Multipath Subsystem Device Driver Version 1.6.3.0-4 README for Linux 2.4 August 01, 2007 ------------------------------------------------------------------------------- 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 2.1 Upgrading from previous releases 2.2 Using SDD with LVM 3.0 SDD Change History 3.1 Defects Fixed 3.1.1 Common 3.1.2 ESS/DS8000/DS6000 Defects 3.1.3 SVC 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 5.0 Notices 6.0 Trademarks and Service Marks ------------------------------------------------------------------------------- 1.0 About this README file Welcome to IBM System Storage Multipath Subsystem Device Driver (SDD). This README file contains the most recent information about the IBM System Storage Multipath Subsystem Device Driver, Version 1.6.3.0-4 for Linux. IBM recommends that you go to the following Web site to get the most current information about this release of SDD: http://www.ibm.com/servers/storage/support/software/sdd/ You should carefully review the following information available through the website: 1. The most current README file. This will contain corrections to this readme file, corrections to the SDD User's Guide, and other documentation updates discovered since this copy of the README was prepared. 2. The Multipath SDD User's 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 Multipath 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 periodocally to see any new Flashes that have been posted since your last review. For prerequisites information, be sure to look in the Multipath SDD User's Guide as well as the prerequisites section of this readme file for the latest updates. For specifics on the hardware and software levels supported by a storage family, please refer to the interoperability information provided by the storage family. 1.1 Who should read this README file This README file is in general 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 Please refer to SDD support matrix to determine the supported SDD levels for above storage subsystem. 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.ibm.com/servers/storage/support/software/sdd/ 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 Total Storage DS8000 support: http://www.ibm.com/servers/storage/disk/ds8000/index.html Go to the following Web site for IBM Total Storage DS6000 support: http://www.ibm.com/servers/storage/disk/ds6000/index.html Go to the following Web site for IBM System Storage SAN Volume Controller support: http://www.ibm.com/servers/storage/support/virtual/2145.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 One of the following combinations of a Linux distribution and associated vendor compiled binary kernel packages: Red Hat Enterprise Linux 3.0 (x86) with one of the following kernels: U5: kernel-smp-2.4.21-32.EL kernel-hugemem-2.4.21-32.EL kernel-smp-2.4.21-32.0.1.EL kernel-hugemem-2.4.21-32.0.1.EL U6: kernel-smp-2.4.21-37.EL kernel-hugemem-2.4.21-37.EL kernel-smp-2.4.21-37.0.1.EL kernel-hugemem-2.4.21-37.0.1.EL U7: kernel-smp-2.4.21-40.EL kernel-hugemem-2.4.21-40.EL U8: kernel-smp-2.4.21-47.EL kernel-hugemem-2.4.21-47.EL kernel-smp-2.4.21-47.0.1.EL kernel-hugemem-2.4.21-47.0.1.EL U9: kernel-smp-2.4.21-50.EL kernel-hugemem-2.4.21-50.EL Red Hat Enterprise Linux 3.0 (ppc64) with one of the following kernels: U5: kernel-2.4.21-32.EL kernel-2.4.21-32.0.1.EL U6: kernel-2.4.21-37.EL kernel-2.4.21-37.0.1.EL U7: kernel-2.4.21-40.EL U8: kernel-2.4.21-47.EL kernel-2.4.21-47.0.1.EL U9: kernel-2.4.21-50.EL SuSE SLES8 / UnitedLinux 1.0 (x86) with one of the following kernels: SP4: k_smp-2.4.21-278 k_smp-2.4.21-281 k_smp-2.4.21-286 k_smp-2.4.21-292 k_smp-2.4.21-295 k_smp-2.4.21-304 k_smp-2.4.21-306 k_smp-2.4.21-309 k_smp-2.4.21-314 SuSE SLES8 (ppc64) with one of the following kernels: SP4: kernel-ppc64-2.4.21-278 kernel-ppc64-2.4.21-281 kernel-ppc64-2.4.21-292 kernel-ppc64-2.4.21-295 kernel-ppc64-2.4.21-304 kernel-ppc64-2.4.21-306 kernel-ppc64-2.4.21-309 kernel-ppc64-2.4.21-314 Red Flag Advanced Server 4.1/Asianux 1.0 kernel-2.4.21-9.30AXsmp kernel-2.4.21-20.19AXsmp * Newly supported in this release. 2.1 Upgrading from previous releases Users upgrading from a pre-SDD 1.6.1.x package should NOT use the rpm upgrade command (rpm -U). Instead: 1. Uninstall the SDD package using the RPM erase command: rpm -e IBMsdd 2. Install the new SDD 1.6.1.x or later package: rpm -i 3. If you modified your /etc/vpath.conf, the rpm -e command saved a copy in /etc/vpath.conf.rpmsave. To preserve your /etc/vpath.conf modifications, you must also copy the /etc/vpath.conf.rpmsave to /etc/vpath.conf. 2.2 Using SDD with LVM LVM with SDD on SLES 8 is only supported on LVM version lvm-1.0.5-129 or later. Please upgrade your LVM to this version or later using the SUSE maintweb update. Your LVM will not work with SDD vpath devices correctly otherwise. LVM with SDD on RHEL 3 is only supported on LVM version lvm-1.0.8-14 or later. This is the LVM level that comes packaged with RHEL 3 Update 6. Please upgrade your LVM to this version or later using the Red Hat up2date utility. Your LVM will not work with SDD vpath devices correctly otherwise. ------------------------------------------------------------------------------- 3.0 SDD Change History =============================================================================== 3.1 Defects Fixed 3.1.1 Common 1.6.3.0-4 o sw 4103 vpath_chrdev_read overwriting kernel space memory o sw 4112 replace "wc -l" with "grep -c" in rcscript 1.6.3.0-1 o Incorrect version reported during module load for RHEL 3 distros. o Using fdisk to query information for a vpath partition causes the kernel to hang. 1.6.1.0-4 o sw 3867 / mc 179403 Volume Size incorrect in essmap on x86 archs 3.1.2 ESS defects None 3.1.3 SVC defects None =============================================================================== 3.2 New Features 1.6.1.0-1 o sw 3762/mc 170499 Allow SDD rpm to be installed in other locations besides /opt/IBMsdd. o PCR-2888/OAR-1064 Add support for ESSUTIL. o PCR-2853/OAR-1066 Add support for "datapath clear device count" command to clear SDD vpath device select and error counts. =============================================================================== 3.3 Feature Details 1.6.1.0-1 o sw 3762/mc 170499 Allow SDD rpm to be installed in other locations besides /opt/IBMsdd. For example, to install in /usr: rpm -ivh --prefix=/usr See the SDD User's Guide for more information. o PCR-2888/OAR-1064 Add support for ESSUTIL. See the SDD User's Guide for more information. o PCR-2853/OAR-1066 Add new datapath command to clear Select and/or Error counts as displayed in the "datapath query device" output. Command: datapath clear device n count error/all Syntax: - datapath clear device n count error - datapath clear device n count all - datapath clear device n m count error - datapath clear device n m count all Parameters: - n : The device number that needs its Select/Error count reset. - n m : A range of device numbers whose Select/Error counts need to be reset. - error : Only Error count is reset. - all : Both Select and Error counts are reset. =============================================================================== 3.4 Known Issues o Adding vpath entries in /etc/fstab will not mount those devices at boot-up time. If you need to mount vpath devices at boot-up time, follow the automount procedure documented in the User's Guide. o Due to a bug in NFS, vpath devices with minor number > 255, when exported using NFS, will cause mount to hang on the client. To work around this, use the fsid option in /etc/exports. For more details, please refer to the man page, i.e. "man exports". =============================================================================== 3.5 Correction to User's Guide ------------------------------------------------------------------------------ 4.0 User License Agreement for IBM Device Drivers See LICENSE file located in IBMsdd install directory. ------------------------------------------------------------------------------- 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. 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