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OpenVMS ALPDRIV01_071 Alpha V6.2 - V7.1 DRDRIVER ECO Summary

NOTE: An OpenVMS saveset or PCSI installation file is stored on the Internet in a self-expanding compressed file. The name of the compressed file will be kit_name-dcx_vaxexe for OpenVMS VAX or kit_name-dcx_axpexe for OpenVMS Alpha. Once the file is copied to your system, it can be expanded by typing RUN compressed_file. The resultant file will be the OpenVMS saveset or PCSI installation file which can be used to install the ECO. Copyright (c) Digital Equipment Corporation 1997. All rights reserved. PRODUCT: OpenVMS Alpha Volume Shadowing COMPONENT: SWXCR RAID Array Driver (SYS$DRDRIVER.EXE) SOURCE: Digital Equipment Corporation ECO INFORMATION: ECO Kit Name: ALPDRIV01_071 ECO Kits Superseded by This ECO Kit: ALPDRIV04_062 ECO Kit Approximate Size: 414 Blocks Saveset A - 180 Blocks Saveset B - 108 Blocks Saveset C - 126 Blocks Kit Applies To: OpenVMS Alpha V6.2, V6.2-1H1, V6.2-1H2, V6.2-1H3, V7.1 System/Cluster Reboot Necessary: Yes Installation Rating: 2 - To be installed on all systems running the listed version(s) of OpenVMS and using the following feature(s): Only customers who are using the SWXCR controller with more than 1GB of physical memory. NOTE: In order to receive the full fixes listed in this kit, the following remedial kits also need to be installed: None ECO KIT SUMMARY: An ECO kit exists for DRDRIVER.EXE on OpenVMS Alpha V6.2, V6.2-1H1 V6.2-1H2, V6.2-1H3, and V7.1. This kit addresses the following problems: o There are actually two instances of essentially the same problem. The first is in routine dr_compare(), the second in dr_diagnose(). Those routines both call dr_allocate_io(), which (on large-memory systems) allocates map registers based on the values of irp$l_boff and irp$l_bcnt. These registers are then used to map, not the user buffer, but a driver-private buffer (dr->buffer) that is to be the target of the eventual I/O request. If the page alignment of dr->buffer is such that the I/O touches an extra page there that it wouldn't have touched in the user buffer, dr_allocate_io() can end up allocating one too few map registers, and the resulting DMA operation fails to transfer the correct amount of data. In both cases, the driver has been modified to set irp$l_boff temporarily to the correct value for the driver-private buffer before the call to dr_allocate_io(). irp$l_boff is then restored to its original value. Problems addressed in ALPDRIV04_062 kit o DRDRIVER (the SWXCR RAID array driver) can hang. This hang occurs when a shadow copy is in progress between two logical RAID (DR) drives, and the SWXCR controller is under an extremely heavy I/O load. CSC NOTE: The hang might also occur in any process that is performing I/O. This includes the SWXCR Monitor and/or manager processes. This problem is corrected in OpenVMS Alpha V7.0. INSTALLATION NOTES: In order for the corrections in this kit to take effect, the system must be rebooted. If the system is a member of a VMScluster, the entire cluster should be rebooted.



This patch can be found at any of these sites:

Colorado Site
Georgia Site



Files on this server are as follows:

alpdriv01_071.README
alpdriv01_071.CHKSUM
alpdriv01_071.CVRLET_TXT
alpdriv01_071.a-dcx_axpexe
alpdriv01_071.b-dcx_axpexe
alpdriv01_071.c-dcx_axpexe

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