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From: system PRIVILEGED account (root
nfsserver.support.compaq.com)Date: Wed Jan 24 2001 - 23:30:16 CST
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* *
* This is a newly released patch... *
* *
* Online links can be found at *
* http://ftp.support.compaq.com/patches/public/vms/axp/v7.2-1/dec-axpvms-vms721_cliutl-v0100--4.README
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TITLE: OpenVMS VMS721_CLIUTL-V0100 Alpha V7.2-1 CLIUTL ECO Summary
Modification Date: 25-JAN-2001
Modification Type: New Kit
NOTE: An OpenVMS saveset or PCSI installation file is stored
on the Internet in a self-expanding compressed file.
For OpenVMS savesets, the name of the compressed saveset
file will be kit_name.a-dcx_vaxexe for OpenVMS VAX or
kit_name.a-dcx_axpexe for OpenVMS Alpha. Once the OpenVMS
saveset is copied to your system, expand the compressed
saveset by typing RUN kitname.dcx_vaxexe or kitname.dcx_alpexe.
For PCSI files, once the PCSI file is copied to your system,
rename the PCSI file to kitname-dcx_axpexe.pcsi, then it can
be expanded by typing RUN kitname-dcx_axpexe.pcsi. The resultant
file will be the PCSI installation file which can be used to install
the ECO.
Copyright (c) Compaq Computer Corporation 2000. All rights reserved.
OP/SYS: OpenVMS Alpha
COMPONENT: CLIUTL
SOURCE: Compaq Computer Corporation
ECO INFORMATION:
ECO Kit Name: VMS721_CLIUTL-V0100
DEC-AXPVMS-VMS721_CLIUTL-V0100--4.PCSI
ECO Kits Superseded by This ECO Kit: None
ECO Kit Approximate Size: 2096 Blocks
Kit Applies To: OpenVMS Alpha V7.2-1
System/Cluster Reboot Necessary: No
Rolling Re-boot Supported: No
Installation Rating: INSTALL_3
3 - To be installed on all systems running
the listed versions of OpenVMS which
are experiencing the problems described.}
Kit Dependencies:
The following remedial kit(s) must be installed BEFORE
installation of this kit:
VMS721_UPDATE-V0100
VMS721_PCSI-V0100
In order to receive all the corrections listed in this
kit, the following remedial kits should also be installed:
VMS721_RMS-V0100
ECO KIT SUMMARY:
An ECO kit exists for CLIUTL on OpenVMS Alpha V7.2-1. This kit addresses
the following problems:
Problems Addressed In VMS721_CLIUTL-V0100:
o Issuing two different SET DEVICE commands can crash a system
at NSA$SIZE_NSAB. This is due to invalid argument counts in
the two $CMKRNL calls.
Images Affected: [SYSEXE]SET.EXE
o A DCL (Digital command language) $ SHOW CLUSTER command will
hang on startup on cluster-nodes with many SCS ports, e.g.,
CIPCA, CIXCD, MC:... or Pxx0: devices, if the
virtual-circuit (PB$ path-block) count exceeds four times the
SCS-node count. An "SCS-node" is defined as any SCS-speaking
node, such as HSJxx/HSCxx Storage Controllers, RFxx DSSI disk
controllers, or VMS nodes, etc.
Images Affected: [SYSEXE]SHWCLSTR.EXE
o SHOW LOGICAL allocates virtual address space based on pagesize
rather than pagelet size for Alpha only. De-allocation of
used virtual memory was incorrect.
Images Affected: [SYSEXE]SHOW.EXE
o The system STARTUP process will hang in a loop waiting for the
AUDIT_SERVER process to start, if the $SET AUDIT/SERVER=START
command fails.
Images Affected: [SYSEXE]SETAUDIT.EXE
o Add a new /CONTENTION_POLICY qualifier to SET RMS_DEFAULT to
address locking fairness issues.
The new Alpha global buffer read-mode lock support introduced
in V7.2-1H1 is functionally compatible with both VAX and older
Alpha releases. Operations in mixed clusters produce correct
results. However, there is a locking fairness issue that may
arise with mixed cluster operations.
In a mixed cluster environment with very high contention for
specific buckets, it is possible for accesses to write-shared
files on nodes using read-mode bucket locking to dominate
access to a bucket. Nodes without this support might be
unable to access the bucket for a protracted period of time.
It is also possible to observe comparable behavior on all
OpenVMS versions when dealing with accesses to write-shared
files without global buffers enabled -- even on a standalone
system. A similar fairness issue between lock conversions and
new lock requests may be observed in which the new lock
requests may remain ungranted for an extended period of time.
This kit provides an interface for RMS support for a new
option to improve fairness under high contention conditions
for write-shared files. The option is controlled using the
/CONTENTION_POLICY qualifier to the DCL command SET
RMS_DEFAULT. The option may be set at a process or system
level. Since selecting this option may noticeably increase
locking overhead and since many applications will never
encounter this issue, the default system behavior leaves this
option disabled. A future lock management enhancement should
make this fairness workaround unnecessary for later releases.
The following are valid PROCESS keywords (/SYSTEM not
specified) for SET RMS_DEFAULT/CONTENTION_POLICY:
NEVER Never use the higher overhead option
to improve fairness for any write-shared
files accessed by this process; minimal overhead.
SOMETIMES Use this option for fairer bucket
access (but higher overhead) to any
write-shared files with global buffers
enabled that are accessed by this process.
ALWAYS Use this option for fairer bucket
access (but higher overhead) to all
write-shared files accessed by this process.
SYSTEM_DEFAULT (Default) Use system setting. Note
that this keyword is disallowed with
/SYSTEM.
The following are valid SYSTEM keywords (/SYSTEM specified):
NEVER (Default) Never use the higher
overhead option to improve fairness
for any write-shared files accessed
on the system; minimal overhead.
SOMETIMES Use this option for fairer bucket
access (but higher overhead) to any
write-shared files with global
buffers enabled that are accessed
on the system.
ALWAYS Use this option for fairer bucket
access (but higher overhead) to all
write-shared files accessed on the system.
Images Affected: [SYSEXE]SET.EXE
o Add infrastructure needed to support external hook: SET
RMS_DEFAULT/QUERY_LOCK.
Images Affected: [SYSEXE]SET.EXE
[SYSEXE]SHOW.EXE
[SYSMSG]CLIUTLMSG.EXE
o If a user attempts to use the SET FILE command to set global
buffers or statistics on a file that is already accessed by
another user, the following error message is displayed:
%SET-E-READERR, error reading <file>
-SYSTEM-W-ACCONFLICT, file access conflict
This is an issue with 24x7 sites in which users may want to
tune or analyze the performance of live files.
Images Affected: [SYSEXE]SET.EXE
o The SHOW DEVICE command, when used for multipath devices,
displays the host name of the primary path rather than that of
the current path.
Images Affected: [SYSEXE]SHOW.EXE
o The SHOW command can fail with a 'Virtual address space full'
error.
Images Affected: [SYSEXE]SHOW.EXE
INSTALLATION NOTES:
No reboot is necessary after successful installation of the kit.
Install this kit with the POLYCENTER Software installation utility
by logging into the SYSTEM account, and typing the following at the
DCL prompt:
PRODUCT INSTALL VMS721_CLIUTL /SOURCE=[location of Kit]
The kit location may be a tape drive, CD, or a disk directory that
contains the kit.
Additional help on installing PCSI kits can be found by typing
HELP PRODUCT INSTALL at the system prompt
All trademarks are the property of their respective owners.
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