ADSM-L

Re: Does audit actually check data integrity?

1996-08-20 17:06:48
Subject: Re: Does audit actually check data integrity?
From: Francis Dequenne <syf AT ECMWF DOT INT>
Date: Tue, 20 Aug 1996 22:06:48 +0100
Ah.

This is a blow.

The obvious next question is "What can I use to make sure that my tapes are
usable? ". Considering that one day, we will have terrabytes worth of tape
archives, here, we can not really play at a game of moving data and locking
multiple drives every time that a problem is reported on a drive or media, just
to make sure that we have not loss anything.

On good old MVS, I had 3rd party products like FATS/FATAR that allowed me to
make a tape scan and possibly recover some data out of damaged volumes.

Is anybody aware of something comparable on AIX platforms, especially for
magstar medias?

(Software producers, there is a market here! )

Cheers.
On Aug 20,  2:54pm, Paul Zarnowski wrote:
<=> Subject: Re: Does audit actually check data integrity?
<=>No, an audit does not guarantee integrity of the data stored on a tape.
<=>I also had this misconception.  An audit validates file information stored
<=>in the database with that stored on the tape.  It does not actually check
<=>to see that the file data itself is readable and correct.  We discovered
<=>this when an audit volume revealed no problems, yet a move data failed.
<=>..Paul
<=>--
<=>On Tue, 20 Aug 1996 13:44:46 -0400 Tim Dobrowolsky said:
<=>>When an Audit is performed on a tape volume, what exactly does ADSM check?
<=>>Does it just check
<=>>to see if it can find the stored file, or is there a checksum stored in the
<=>>database that is
<=>>checked against the tape file?  What I'm really wondering is whether a
<=>>successful audit guarantees
<=>>the integrity of the data stored on a tape.  Thanks.
<=>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
<=>>> Tim Dobrowolsky                   > <                yksloworboD miT <
<=>>> Computer Services                 > <              secivreS retupmoC <
<=>>> Catonsville Community College     > <  egelloC ytinummoC ellivsnotaC <
<=>>> tim AT catrs.cat.cc.md DOT us            > <         
su.dm.cc.tac.srtac@mit <
<=>>> 410-455-4562                      > <                   2654-554-014 <
<=>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
<=> End of excerpt from Paul Zarnowski



--
Regards
Regards

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