> >I'm talking about byte-by-byte comparison. If you do no comparison,
> >do you check to see that your data is restorable? If you don't check
> >it, you must not have heard the common stories about having no
> >useable backup after a major crash. I've heard many.
>
>What do you do when you get a bad byte-by-byte comparison?
I monitor by backups daily. If I see a media failure, I give the
drive another shot with the tape cleaner, try the tape immediately
for another backup and if it fails, throw it into the garbage.
>I also wished Dantz included a small email client in the retro server so
>that the log could easilly be mailed to the administrator. I've tried to
>get the thirdparty thing to work twize but it fails each time.
There is a way you can manage this with AppleScript, but I've not
implemented it myself.
>I plan to use Luke Jaegers suggestion of one tape each day, wouldn't that
>be secure enough?? I mean, if the byte-to-byte comparisson fails it nly
>matters if it fails on the single files the client were just working with
>or did I miss something...
The key is that you need to know the media -or- the drive has failed.
Otherwise, you experience a silent failure--the write to tape failed,
but you have no idea until you attempt to do a critical restore.
Then you are screwed.
Now, if you have sufficient funding for a new tape every day (365 1/4
tapes a year), then you probably could find a faster and better
backup apparatus (i. e., a bunch of IDE drives).
Hope you enjoy your holiday.
Eric Zylstra
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