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OpenVMS VMS731_BACKUP-V0100 Alpha V7.3-1 BACKUP ECO Summary
TITLE: OpenVMS VMS731_BACKUP-V0100 Alpha V7.3-1 BACKUP 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:       28-MAR-2003
Modification Date:  Not Applicable
Modification Type:  NEW KIT

Copyright (c) Compaq Computer Corporation 2002,2003.  All rights reserved.

OP/SYS:     OpenVMS Alpha 

COMPONENT:  BACKUP 

SOURCE:     Compaq Computer Corporation

ECO INFORMATION:

     ECO Kit Name:  VMS731_BACKUP-V0100
                    DEC-AXPVMS-VMS731_BACKUP-V0100--4.PCSI
     ECO Kits Superseded by This ECO Kit:  None
     ECO Kit Approximate Size:  1328 Blocks
     Kit Applies To:  OpenVMS Alpha V7.3-1 
     System/Cluster Reboot Necessary:  No
     Rolling Re-boot Supported:  Information NA
     Installation Rating:  INSTALL_1
                           1 - To be installed by all customers.

     Kit Dependencies:

       The following remedial kit(s), or later, 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 BACKUP on OpenVMS Alpha V7.3-1.  This kit addresses 
the following problems: 

PROBLEMS ADDRESSED IN VMS731_BACKUP-V0100 KIT

     o  When BACKUP tries to save a shelved file, the QIO does not
        return and both BACKUP and HSM hang.  Also, when using XABITM
        to tell RMS that no caching via the XAB$_CACHING_ATTRIBUTE and
        XAB$_CACHING_OPTIONS items was done, HSM does not work
        correctly if the order was XABITM -> XABPRO

          Images Affected:[SYSEXE]BACKUP.EXE
			  [SYSLIB]BACKUPSHR.EXE




     o  Incremental restores of or to an ODS-5 disk may get the
        following error sequence:

           %BACKUP-E-INCENTERR, error creating directory entry, etc...
           -SYSTEM-W-DUPFILENAME, duplicate file name
           %RMS-F-SYN, file specification syntax error


          Images Affected:[SYSEXE]BACKUP.EXE
			  [SYSLIB]BACKUPSHR.EXE





     o  After an image backup, if the disk is re-mounted the following
        error may occur:

             %MOUNT-F-BADCHKSUM, bad file header checksum

        This can especially occur if the disk is mounted as a
        shadowset member.

          Images Affected:[SYSLIB]BACKUPSHR.EXE




     o  Customers running BACKUPs to tape drives that support Fast
        Skip positioning commands (characteristic of most directly
        connected DLT tape drives), and who are running MME
        applications, such as MTI's MMSUBSYS, may experience problems
        restoring subsequent volumes of a multi-tape backup.

        If tape labels are provided on the BACKUP command line for
        each of the continuation tapes, then the continuation tapes
        are created correctly.  However, if a 'scratch' tape is used,
        the continuation tape will be created with an incorrect HDR1
        record, rendering it unsuitable for future restore operations.

        No errors or warning messages will be displayed during tape
        creation, but on restore, the following error will be seen:

           %BACKUP-I-WRONGVOL, ALPHA3$MKD0:[000000]SY2_IMG.; is not the
           next volume in the set


          Images Affected:[SYSLIB]BACKUPSHR.EXE






     o  A BACKUP/IGNORE=INTERLOCK command could result in intermittent
        READATTR/NOSUCHFILE errors.

        When using a /IGNORE=INTERLOCK switch with BACKUP, files are
        accessed with NOLOCK since the use of the qualifier implies
        target files will be open.  A read operation with NOLOCK
        access (which causes the windows to be created/completed) will
        force the XQP to re-build the FCB chain.  In order to do so,
        the extension FCB chain is deleted and then rebuilt.  If, at
        the same time, another process comes along with a read
        attributes call, the XQP will find that the extension FCB
        chain is missing and not find the extension FCB for the
        header.  The XQP assumes that the caller is trying to get to
        the extension header directly and returns a NOSUCHFILE error.
        There is nothing that the XQP can do in this case.  Another
        process is forcing the FCB chain to be rebuilt and because of
        the nolock access, the XQP cannot trust the chain.

        BACKUP attempts recovery (retry) from a READATTR error, when a
        "no such file" error is returned from the XQP when reading an
        extension header, with open, fragmented files (/IGN=INTERLOCK
        is used).

        The fix is to retry the same extension header 3 times.  If any
        of those access attempts are successful, continue to move
        forward through the file while logging the number of attempts.
        If the retry count is exhausted the file is no longer
        considered a target and the READATTR/NOSUCHFILE error will be
        reported.  A new message has been added that reports the retry
        count.

        Following are a few examples of possible message sequences:

           o  Success example 1:  Recovered from the first and only
              error.

              %BACKUP-W-READATTRRETRY, 1 READATTR error occurred reading
              $4$DKA310:[READATTR]1XQPXR_FRAGMENT.DAT;1


           o  Success example 2:  17 retries to save the file, though it
              was saved successfully.

              %BACKUP-W-READATTRRETRY, 17 READATTR errors occurred reading
              $4$DKA310:[READATTR]1XQPXR_FRAGMENT.DAT;1


           o  Failure, example 1:  A failing sequence where no
              successful retries occurred before eventually failing on
              the same extheader 3 times.

              %BACKUP-E-READATTR, error reading attributes for
              $4$DKA310:[READATTR]1XQPXR_FRAGMENT.DAT;1
              -SYSTEM-W-NOSUCHFILE, no such file
              %BACKUP-W-READATTRRETRY, 1 READATTR error occurred reading
              $4$DKA310:[READATTR]1XQPXR_FRAGMENT.DAT;1


           o  Failure Example 2:  A failing sequence of 3 successful
              retries while moving forward through the file on different
              EXTHDRS, but eventually, unable to recover from the fourth
              READATTR detected.

              %BACKUP-E-READATTR, error reading attributes for
              $4$DKA310:[READATTR]2XQPXR_FRAGMENT.DAT;1
              -SYSTEM-W-NOSUCHFILE, no such file
              %BACKUP-W-READATTRRETRY, 4 READATTR errors occurred reading
              $4$DKA310:[READATTR]2XQPXR_FRAGMENT.DAT;1


          The larger the size, more fragmented and interactive the open
          file, the lesser the chance of success.  Use of
          /IGNORE=INTERLOCK implies open files are to be processed.  If
          messages for files are paired (both READATTR/READATTRRETRY are
          reported) then the file did not get saved completely.  Success
          is a READATTRRETRY message only.

          Images Affected:[SYSEXE]BACKUP.EXE
			  [SYSLIB]BACKUPSHR.EXE




     o  BACKUP may fail with BACKUP-F-GETCHN/SYSTEM-I-IVIDENT error
        while performing a /IMAGE operation on a disk that is mounted
        /FOREIGN.  For example:

        SYSTEM>BACKUP/IMAGE/IGN=NOBACK DR8015 DR8016
        %BACKUP-F-GETCHN, error getting device characteristics for
        $1$DGA8016:
        -SYSTEM-F-IVIDENT, invalid identifier format


          Images Affected:[SYSEXE]BACKUP.EXE
			  [SYSLIB]BACKUPSHR.EXE



     o  A BACKUP-F-CLUSTER error message can be received during a
        BACKUP/IMAGE/NOINIT operation.  Particularly after
        pre-initializing a large output device with a small cluster
        value and a large/max header/ number of files.

          Images Affected:[SYSEXE]BACKUP.EXE
			  [SYSLIB]BACKUPSHR.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 VMS731_BACKUP /SOURCE=[location of
Kit]


Special Installation Instructions:

     o  Scripting of Answers to Installation Questions

        During installation, this kit will ask and require user
        response to several questions.  If you wish to automate the
        installation of this kit and avoid having to provide responses
        to these questions, you must create a DCL command procedure
        that includes the following definitions and commands:

           -  DEFINE/SYS NO_ASK$BACKUP TRUE

           -  Add the following qualifiers to the PRODUCT INSTALL
              command and add that command to the DCL procedure.

                /PROD=DEC/BASE=AXPVMS/VER=V1.0

           -  De-assign the logicals assigned

        For example, a sample command file to install the
        VMS731_BACKUP-V0100 kit would be:

          $
          $ DEFINE/SYS NO_ASK$BACKUP TRUE
          $!
          $ PROD INSTALL VMS731_BACKUP/PROD=DEC/BASE=AXPVMS/VER=V1.0
          $!
          $ DEASSIGN/SYS NO_ASK$BACKUP
          $!
          $ exit


All trademarks are the property of their respective owners.
Files on this server are as follows:
»dec-axpvms-vms731_backup-v0100--4.README
»dec-axpvms-vms731_backup-v0100--4.CHKSUM
»dec-axpvms-vms731_backup-v0100--4.pcsi-dcx_axpexe
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