Patch Name: PHKL_11521 Patch Description: s700 10.01 SCSI tape cumulative patch Creation Date: 97/06/26 Post Date: 97/07/02 Hardware Platforms - OS Releases: s700: 10.01 Products: N/A Filesets: OS-Core.CORE-KRN ProgSupport.C-INC Automatic Reboot?: Yes Status: General Release Critical: Yes PHKL_11521: PANIC PHKL_6568: PANIC Panic occurs only when using an unsupported device Path Name: /hp-ux_patches/s700/10.X/PHKL_11521 Symptoms: PHKL_11521: - Fixes an intermittent panic when opening a tape device on the HSC bus - Improves performance for wide SCSI tape devices connected via the HSC bus - Allows DLT4000 devices to perform odd-sized writes PHKL_10417: When reading a tape on a 7980S tape drive, reading a partial record fails and returns I/O Error. If a tape device receives a bus reset the device will rewind. Following this, when the device is closed, the driver will write EOF marks at the beginning of the tape causing the remaining data to be unusable. When a tape device is opened for write access and the media is write protected the driver returns I/O Error, which can be ambiguous. EPERM (Permission denied) is a more descriptive error. PHKL_8751: Fixes a bug with Exabyte tape drives that caused append writes (those not at BOT) to be in non-compressed mode when using the BEST density setting. PHKL_8502: This patch changes the behavior of the open() call with write protected tape. The open() will now fail with EIO if the mode is not O_RDONLY. PHKL_7953: This is a performance enhancement for tape drives attached to the GSC bus. PHKL_6568: The system will panic if an access is made to an Exabyte tape drive other than those models that are officially supported. Defect Description: PHKL_11521: - The tape driver will occasionally panic on the open of a tape device which is attached to the HSC bus. The panic is caused when a tape device responds with a "check condition" very early in the open process. The problem is intermittent and can not be reliably reproduced. - Patches PHKL_10417 through PHKL_10422 changed the way the driver negotiated with the device for narrow (8 bit) or wide (16 bit) transfers. This fixed a problem with 7980S tape drives, but caused the driver to never correctly negotiate for wide transfers. Any wide device on a wide interface would suffer a performance degradation because the driver was throttling it down to 8 bit transfers instead of 16 bit transfers. - Because of problems with transfering an odd number of bytes over a wide bus, the driver prevents doing an odd sized write to a wide device. The DLT4000 is a narrow device, but it is differential so it attaches to a wide bus. The driver was looking at the bus size, rather than the device type, to determine the transfer size and so it was blocking odd-sized transfers to DLT4000 devices even though these should be allowed. Writing an odd-sized record to a DLT4000 would return an EIO error. PHKL_10417: 7980S problem was caused by a change in the SCSI interface driver which caused the interface to negotiate for synchronous even when the driver had not enabled that negotiation. The 7980S drive is not SCSI-2 compliant, and has problems with synchronous negotiation in some places. Other changes were enhancements - no defect. PHKL_8751: The Exabyte bug can be reproduced by writing a large (100 Mb) file to an Exabyte drive using the 'BEST' device file in 'no rewind' mode, then writing the same file again to the same device. The first write will be substantially faster because it is compressed while following writes are not compressed. PHKL_8502: Before this patch the open() call did not look at media write protection. A write() to a write protected tape would fail, but an open() with FWRITE mode would succeed. This change was made to make the HSC driver behave the same as the NIO driver. . PHKL_7953: No defect. This patch provides for a performance enhancement for tape drives attached to the GSC bus. PHKL_6568: If a drive was found that had a manufacturer of Exabyte but was not one of the supported drives the product name got set to NULL. Deferencing this NULL pointer later on caused a system panic. SR: 1653148098 1653215020 4701329417 4701342089 5003329078 5003359489 Patch Files: /usr/conf/h/mtio.h /usr/conf/lib/libhp-ux.a(scsi_tape.o) /usr/include/sys/mtio.h what(1) Output: /usr/conf/h/mtio.h: mtio.h $Date: 97/01/30 11:36:13 $ $Revision: 1.21.72 .20 $ PATCH_10.01 (PHKL_8751) /usr/conf/lib/libhp-ux.a(scsi_tape.o): scsi_tape.c $Date: 97/06/25 15:30:35 $ $Revision: 1. 2.72.28 $ PATCH_10.01 (PHKL_11521) /usr/include/sys/mtio.h: mtio.h $Date: 97/01/30 11:36:13 $ $Revision: 1.21.72 .20 $ PATCH_10.01 (PHKL_8751) cksum(1) Output: 3998933746 25657 /usr/conf/h/mtio.h 1077521624 68100 /usr/conf/lib/libhp-ux.a(scsi_tape.o) 3998933746 25657 /usr/include/sys/mtio.h Patch Conflicts: None Patch Dependencies: None Hardware Dependencies: None Other Dependencies: None Supersedes: PHKL_6568 PHKL_7953 PHKL_8502 PHKL_8751 PHKL_10417 Equivalent Patches: None Patch Package Size: 160 KBytes Installation Instructions: Please review all instructions and the Hewlett-Packard SupportLine User Guide or your Hewlett-Packard support terms and conditions for precautions, scope of license, restrictions, and, limitation of liability and warranties, before installing this patch. ------------------------------------------------------------ 1. Back up your system before installing a patch. 2. Login as root. 3. Copy the patch to the /tmp directory. 4. Move to the /tmp directory and unshar the patch: cd /tmp sh PHKL_11521 5a. For a standalone system, run swinstall to install the patch: swinstall -x autoreboot=true -x match_target=true \ -s /tmp/PHKL_11521.depot 5b. For a homogeneous NFS Diskless cluster run swcluster on the server to install the patch on the server and the clients: swcluster -i -b This will invoke swcluster in the interactive mode and force all clients to be shut down. WARNING: All cluster clients must be shut down prior to the patch installation. Installing the patch while the clients are booted is unsupported and can lead to serious problems. The swcluster command will invoke an swinstall session in which you must specify: alternate root path - default is /export/shared_root/OS_700 source depot path - /tmp/PHKL_11521.depot To complete the installation, select the patch by choosing "Actions -> Match What Target Has" and then "Actions -> Install" from the Menubar. 5c. For a heterogeneous NFS Diskless cluster: - run swinstall on the server as in step 5a to install the patch on the cluster server. - run swcluster on the server as in step 5b to install the patch on the cluster clients. By default swinstall will archive the original software in /var/adm/sw/patch/PHKL_11521. If you do not wish to retain a copy of the original software, you can create an empty file named /var/adm/sw/patch/PATCH_NOSAVE. Warning: If this file exists when a patch is installed, the patch cannot be deinstalled. Please be careful when using this feature. It is recommended that you move the PHKL_11521.text file to /var/adm/sw/patch for future reference. To put this patch on a magnetic tape and install from the tape drive, use the command: dd if=/tmp/PHKL_11521.depot of=/dev/rmt/0m bs=2k Special Installation Instructions: None