OpenVMS ALPMSCP01_071 Alpha V7.1 TMSCP/MSCP ECO Summary

TITLE: OpenVMS ALPMSCP01_071 Alpha V7.1 TMSCP/MSCP 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
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       can be used to install the ECO.
 
*OpenVMS] ALPMSCP01_071 Alpha V7.1 TMSCP/MSCP ECO Summary
 
Copyright (c) Compaq Computer Corporation 1998.  All rights reserved.

OP/SYS:     OpenVMS Alpha 

COMPONENT:  TMSCP.EXE 
            MSCP.EXE

SOURCE:     Compaq Computer Corporation

ECO INFORMATION:

     ECO Kit Name:  ALPMSCP01_071
     ECO Kits Superseded by This ECO Kit:  None 
     ECO Kit Approximate Size:  342 Blocks
     Kit Applies To:  OpenVMS Alpha V7.1 through V7.1-1H2
     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):

                               Systems that MSCP serve tapes and disks.

     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 TMSCP and MSCP on OpenVMS Alpha V7.1 through V7.1-1H2.  
This kit addresses the following problems: 

  o  Unexpected end messages are logged on client nodes for GUS and
     AVAILABLE commands.  A Cache Data Lost error is detected in the 
     tape subsystem due to a hardware-related problem.  A GUS end 
     message is returned to the client with an end message status of 
     08 (data error).  This status is set up in the SEND_END routine 
     in TMSCP.  Since this is not a valid status for a GUS, the client  
     TUDRIVER rejects the invalid status, logs an error and then calls
     TU$RE_SYNCH which breaks the connection.

     For the same Cache Data Lost error, if an AVAILABLE command is
     issued, the controller should return CDL until the host clears
     the condition in the controller.  TUDRIVER in the server, upon
     receipt of an end message for AVAILABLE which indicates CDL,
     will then issue another AVAILABLE with the clear cache data
     lost modifier set in the packet.  The only status that is
     checked on the receipt of this end message is for PRESE which
     will return SS$_DATALOST.  Anything else returns SS$_DATALOST.

  o  An INVEXCEPTN system crash may occur when TMSCP does not get a  
     message buffer during configuration when a connection to 
     MSCP$TAPE is broken.

  o  An inconsistent transfer count occurs when a forced error is
     encountered on a drive.  A drive directly attached (or HSx
     served) reports a different transfer count from the same drive
     served via the MSCP server.

     Code that attempts to determine the LBN of a forced error
     block by looking at the byte count in the IOST/IOSB will
     arrive at different values on the same drive when directly
     accessed or MSCP served.


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. 

Files on this server are as follows:

»alpmscp01_071.README
»alpmscp01_071.CHKSUM
»alpmscp01_071.CVRLET_TXT
»alpmscp01_071.a-dcx_axpexe