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OpenVMS VMS731_RMS-V0100 Alpha V7.3-1 RMS ECO Summary
TITLE: OpenVMS VMS731_RMS-V0100 Alpha V7.3-1 RMS ECO Summary
 
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.pcsi-dcx_axpexe or
       kitname.pcsi-dcx_vaxexe, then it can be expanded by typing
       RUN kitname.pcsi-dcx_axpexe or kitname.pcsi-dcx_vaxexe.  The
       resultant file will be the PCSI installation file which can be
       used to install the ECO.
 

New Kit Date:       18-SEP-2002
Modification Date:  Not Applicable
Modification Type:  NEW KIT

Copyright (c) Compaq Computer Corporation 2001,2002.  All rights reserved.

OP/SYS:     OpenVMS Alpha

COMPONENT:  RMS

SOURCE:     Compaq Computer Corporation

ECO INFORMATION:

     ECO Kit Name:  VMS731_RMS-V0100
                    DEC-AXPVMS-VMS731_RMS-V0100--4.PCSI
     ECO Kits Superseded by This ECO Kit:  None
     ECO Kit Approximate Size:  2592 Blocks
     Kit Applies To:  OpenVMS Alpha V7.3-1
     System/Cluster Reboot Necessary:  Yes
     Rolling Re-boot Supported:  Yes
     Installation Rating:  INSTALL_1
                            1 - To be installed on all systems running
                                the listed version(s) of OpenVMS.
     
     Kit Dependencies:

       The following remedial kit(s) must be installed BEFORE
       installation of this kit:

         None

       In order to receive all the corrections listed in this
       kit, the following remedial kits should also be installed:

         None


ECO KIT SUMMARY:

An ECO kit exists for RMS on OpenVMS Alpha V7.3-1.  This kit addresses the 
following problems: 

PROBLEMS ADDRESSED IN VMS731_RMS-V0100 KIT

     o  RMS fix for a user buffer size exceeding the  terminal  driver
        limit (in particular if the SYSGEN parameter MAXBUF is greater
        than 32K and the session is a Telnet session).

        The specific error returned by a terminal  driver  to  RMS  is
        SS$_IVBUFLEN;  RMS  returns  to  the  caller  RMS-F-QIO in the
        RAB$L_STS  and  the  system  error  (SYS-F-IVBUFLEN)  in   the
        RAB$L_STV.   However, if this error is returned to a C runtime
        library call for a read I/O to a terminal, it is  more  likely
        the  symptom visible to users will be a C program failing with
        a a generic C IO error.

        An RMS change was implemented in Alpha V7.3-1 that may  result
        in a larger I/O transfer size being used for "reads" from unit
        record devices (mainly terminals) than  the  previous  smaller
        default  RMS  intermediate  buffer  size.   The larger size is
        based on the size of the user's record buffer specified in the
        RAB (RAB$W_USZ or RAB64$Q_USZ) for the read.

        Under certain conditions, the larger  size  can  result  in  a
        limit   imposed  by  at  least  one  driver  (TTDRIVER)  being
        exceeded.  Drivers are free to set  a  limit  arbitrarily;  in
        this  case  the  limit  imposed  is  32767.  When the limit is
        exceeded, an SS$_IVBUFLEN  fatal  error  is  returned  by  the
        driver.

        One example of the combination of conditions that can  trigger
        this problem is as follows:

        -  System is accessed via Telnet (TNDRIVER) or SET  HOST/LAT.
           This  results  in the particular TT driver with this limit
           being used for the terminal I/O.  A regular SET HOST  uses
           another  terminal  driver and does not encounter the limit
           check.

        -  The read request to this  particular  TT  driver  is  made
           through RMS with the user buffer size specified in the RAB
           (RAB$W_USZ  or  RAB64$Q_USZ)  being  greater  than  32767.
           While  this  could  be  done  from any application issuing
           calls to RMS,  there  is  a  high  probability  that  a  C
           application  with  a  C  runtime library call to read data
           from a terminal (e.g.  getc, gets) may be involved if  the
           SYSGEN  parameter  MAXBUF on the impacted system is set to
           greater than 32K.

           The C runtime  library  uses  a  heuristic  involving  the
           SYSGEN  parameter  MAXBUF value (MAXBUF less 512 bytes) to
           set the buffer size  in  the  RAB  passed  to  RMS.   This
           parameter  ships with a default of 8192 (with a maximum of
           64000).  However, some systems increase this parameter  to
           the  maximum  for  tuning purposes.  This results in the C
           runtime library  heuristic  setting  a  user  buffer  size
           greater  than  32K.   There is nothing substantively wrong
           with the C runtime library or any application specifying a
           user buffer size greater than 32K.

          For  this  particular  example,  a  proactive  measure  or  an
          immediate  workaround  to  the  problem  is  to set the MAXBUF
          SYSGEN parameter down to 32K.  This is a dynamic parameter  so
          no  reboot  is required.  We are not aware of any applications
          that would break by setting MAXBUF down  to  32K.   Once  this
          remedial  kit  is  applied, the SYSGEN parameter MAXBUF can be
          reset above 32K.

            Images Affected:[SYS$LDR]RMS.EXE
                          [SYSLIB]SDARMS$SHARE.EXE



     o  RMS fix for an incorrect record returned  for  a  reverse  key
        search  on  a  secondary  key  using  a partial key (just some
        leading characters).

        As a side-effect of calling a sequence of  common  lower-level
        routines  to unpack a compressed key or segmented primary key,
        the potential exists that an RMS internal scratch  key  buffer
        may  be overwritten.  This results in the target secondary key
        value being replaced with the primary key associated with  the
        primary  record  being  unpacked.   The full set of conditions
        necessary for this to occur are rare.

        While no user data is compromised by the overwriting,  if  the
        copy  of  the  target  secondary  key value gets replaced, the
        search from thereon uses this  particular  primary  key  value
        rather  than  the  target secondary key value as its criterion
        for the secondary key search.  In such a case if  the  forward
        search  for a match reaches the end-of-the-key without finding
        either an exact match or a "mismatch" (a record with a  higher
        key  value), it will return the last record at the end of that
        secondary key as the match.

          Images Affected:[SYS$LDR]RMS.EXE



INSTALLATION NOTES:

This kit requires a system reboot.  Compaq strongly recommends that
a  reboot  is performed immediately after kit installation to avoid
system instability

If you have other nodes in your OpenVMS cluster, they must also  be
rebooted  in  order  to make use of the new image(s).  If it is not
possible or convenient to reboot the entire cluster at this time, a
rolling re-boot may be performed.

INSTALLATION INSTRUCTIONS:

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 VMS731_RMS /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.

Files on this server are as follows:
»dec-axpvms-vms731_rms-v0100--4.README
»dec-axpvms-vms731_rms-v0100--4.CHKSUM
»dec-axpvms-vms731_rms-v0100--4.pcsi-dcx_axpexe
»vms731_rms-v0100.CVRLET_TXT
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