Re: Shadow set problem finally solved

In article <47d95126$0$5604$607ed4bc@xxxxxx>, VAXman- @SendSpamHere.ORG writes:
In article <e4c3e60b-d047-4cf7-af86-93aab9191c36@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>, tadamsmar <tadamsmar@xxxxxxxxx> writes:
{...snip...}

Opps, not quite there. It ran clean on the single disk. But when I
add the other disk to the shadowset it reported the 4 blocks with
errors. VMS does not want to give these up without a fight.

I'm am going to init/erase that disk.

Actually, there should be no need to.

The shadow copy actually _reads_ from both disks before overwriting - for
reasons that are not precisely clear to me - and it is expected behavior
in that case for a read error to occur given that we already know that
the target volume has forced error bits. After reading, however, it
will go forward with overwriting those blocks thus clearing the forced
error bits.

I would guess that if you re-ran the shadow copy the errors would have
disapperared.

What happens if you shadow and mount an init'd disk (i.e. nothing on it)?

VAXman, you may not have been following the entire thread (or set of threads),
but he has tried a number of things, including

$ BACKUP/IMAGE source/SAVE_SET original_source_member:

which of course initializes the volume before writing the files, and has
not had the problem go away, presumably because nothing has ever written
to the particular block(s) with the forced error bits.

The $ INIT/ERASE was an attempt to completely overwrite the volume before
restoring the backup.

--
George Cornelius Remove BEGIN/END delimiters to reply


--
VAXman- A Bored Certified VMS Kernel Mode Hacker VAXman(at)TMESIS(dot)COM

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