OpenVMS - cannot read BACKUP savesets after file transfers such as FTP

Owned by Bruno Miretti (Deactivated)
Last updated: Feb 06, 2017Version comment
1 min read

Problem

Backup savesets cannot be read by OpenVMS. The BACKUP command fails with error like:

$ BACKUP /LIST DEMO.BCK /SAVE

...

%BACKUP-E-READERRS, excessive error rate reading SYS$SYSROOT:[SYSMGR]DEMO.BCK;1

-BACKUP-E-HDRCRC, software header CRC error

%BACKUP-I-OPERSPEC

%BACKUP-I-OPERASSIST, operator assistance has been requested

%%%%%%%%%%%  OPCOM  18-DEC-2014 17:26:25.22  %%%%%%%%%%%

Request 2, from user SYSTEM on VMS071

%BACKUP-I-OPERSPEC, specify option (QUIT or CONTINUE)

Solution

Record format and record length attributes have to be reset using the following script:

$! RESET_BACKUP_SAVESET_ATTRIBUTES.COM

$!

$! P1  is the specification of the BACKUP saveset

$!

$! This procedure resets the record format and record

$! length attributes of a BACKUP saveset -- savesets

$! can get "broken" during certain sorts of file

$! transfers -- such as FTP.  This procedure reads the

$! (undocumented) saveset record attributes directly

$! out of the target file.

$!

$! First render the saveset readable, and implicitly

$! check that the file exists.

$!

$ Set File -

    /Attributes=(RFM:FIX,MRS:512,LRL=512,ORG=SEQ,RAT=NONE) -

    'p1'

$

$ Open/Error=whoops/Read BckSaveset 'p1'

$ Read/Error=whoops/End=whoops BckSaveset Record

$ Close/Nolog BckSaveset

$

$! Find the blocksize from within the record...

$

$ BlockSize = 0

$ BBH_L_BLOCKSIZE = %x28*8

$ BlockSize = F$CVUI(BBH_L_BLOCKSIZE, 32, Record)

$ If BlockSize .lt. 2048 .or. BlockSize .gt. 65535

$ Then

$   Write sys$output "Unexpected block size"

$   Goto whoops

$ Else

$   Set File /Attributes=(RFM:FIX,LRL='BlockSize', -

       MRS='BlockSize',RAT=none) -

       'p1'

$ endif

$ exit

$WHOOPS:

$ Write sys$output "Error"

$ exit

Use copy/paste on your OpenVMS system or download the following file:


Example:

$ @RESET_BACKUP_SAVESET_ATTRIBUTES DEMO.BCK


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