[Info-vax] Backup/physical question

[Michael Moroney]

JF Mezei <jfmezei.spamnot at vaxination.ca> writes:

>Now...

>> $ backup/physical/log dua2: dua2.save/save
>> %BACKUP-E-READBLOCK, error reading block 1020 of DUA2:
>> -SYSTEM-F-DRVERR, fatal drive error
>> %BACKUP-S-COPIED, copied DUA2:

>Does this mean a single sector was bad ? Would this mean that on the
>output device, block 1020 will be full of nulls or random characters ?
>Or that block 1021 on origimal device will be at block 1020 on new device ?


The recorded block 1020 will contain incorrect data.  I don't know if the
BACKUP/driver combination will have produced its best effort at getting
the data, or if it will be zeroes or something else.

You may want to do a $ BACKUP/COMPARE/physical dua2: dua2.save/save
to see if the other blocks copied OK.  I personally would have done a
$ BACKUP/VERIFY initially, given that you're dealing with ancient
untrustworthy media in a drive which just had decades of crud removed with
a cleaning disk.