[Info-vax] Backup verify problems

[AEF]

On Jan 31, 12:58 pm, SMS <sms.antin... at gmail.com> wrote:
> AEF wrote:
> > Isn't that a bug that was fixed at some point?
>
>    Got me.  I wouldn't bet on it.  And I'm still waiting for a
> complete problem report from the original whiner (which might
> offer some clue as to at which point that might have been).
>
> > I tried it and it worked fine:
>
>    Did you try it with the same file as the O.W.?  It would be
> data-dependent.  I have a dim recollection of seeing some
> (VAX?) .OBJ files which had some non-zero bytes after EOF, too.
> May have shown up with UnZip after Zip -V.  I believe that we
> now clear an extra odd byte when writing one byte after EOF
> (when you must write an even number of bytes), but the annoying
> .OBJ files had more than one junk byte (3?), so it's no good
> without Zip -VV (which generally ignores EOF). BACKUP may be
> smarter, but I don't think that it always does exactly what one
> might expect.
>
>    Might have happened after a move to a larger disk, with a
> bigger cluster size, too.  Had more blocks after EOF on the new
> disk, which caused a mismatch there.  (Or I could be
> delusional.  Again.)
>
>    SMS.

Yes, I tested it with MAIL.MAI. Unless you mean a copy of his actual
MAIL.MAI? No.

Well, I did screw up otherhow: The size of the file was 436/436.

OK, let's try it again:

$ BACK/VERI MAIL$009E18E90005009F.MAI TEMP.BCK/SAVE
%BACKUP-I-STARTVERIFY, starting verification pass
$ BACK/VERI TEMP.BCK/SAVE /SELE= MAIL$009E18E90005009F.MAI .TMP
%BACKUP-I-STARTVERIFY, starting verification pass
$ DIFF MAIL$009E18E90005009F.MAI .TMP
Number of difference sections found: 0
Number of difference records found: 0

DIFFERENCES /IGNORE=()/MERGED=1-
    DISK$DATA1:[FELDMAN.MAILBOX]MAIL$009E18E90005009F.MAI;1-
    DISK$DATA1:[FELDMAN.MAILBOX]MAIL$009E18E90005009F.TMP;1
$ DIR MAIL$009E18E90005009F

Directory DISK$DATA1:[FELDMAN.MAILBOX]

MAIL$009E18E90005009F.MAI;1         61/64       13-SEP-2000
00:00:31.99
MAIL$009E18E90005009F.TMP;1         61/64       13-SEP-2000
00:00:31.99

Total of 2 files, 122/128 blocks.
$

Still okay.

More info:

$ BACK/LIST TEMP.BCK/SAVE
Listing of save set(s)

Save set:          TEMP.BCK
Written by:        FELDMAN
UIC:               [000050,000110]
Date:              31-JAN-2009 17:29:55.90
Command:           BACK/VERI MAIL$009E18E90005009F.MAI TEMP.BCK/SAVE
Operating system:  OpenVMS VAX version V6.2
BACKUP version:    V6.2
CPU ID register:   13000202
Node name:         _XXXXX::
Written on:        _DSA1:
Block size:        32256
Group size:        10
Buffer count:      9

[FELDMAN.MAILBOX]MAIL$009E18E90005009F.MAI;1               61  13-
SEP-2000 00:00

Total of 1 file, 61 blocks
End of save set

$ FILT UPTIME SHOW SYS
%FILTER-I, SEARCHing for  UPTIME  from  $ SHOW SYS
OpenVMS V6.2  on node xxxxx  31-JAN-2009 17:34:13.75  Uptime  84
14:25:24
$

AEF