FYI,

Another method is run a "recover" of the clone (or of the original
data).

I use this method to validate NetWorker data on tape (original SSID or
any SSID/CLONEID combo).

I would use "recover -n -S <ssid/cloneid> ... -d /tmp" which performs
the read but doesn't actually write any data.  I point it to /tmp on
UNIX (but again it doesn't really write anything).

HTH...Dale

-----Original Message-----
From: Legato NetWorker discussion [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU]
On Behalf Of Maarten Boot (CWEU-USERS/CWNL)
Sent: Thursday, January 19, 2006 10:11 AM
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Subject: Re: [Networker] Verification of Clones

Kathleen,

The obvious answer is to clone again, but I realize thats no what you
want to hear. It does however read the complete tape again and verifies
that it is ok both in data and in structure.

Simple data only could be done with just reading the tape with a tool
like dd on unix but that only validates that the tape is readable and
not that it is internally consistent.

(after cloning it a second time one could delete the 3th copy, cloning
to disks springs to mind as an option, not to watste to many tapes)

This will only prove however that at the time of the cloning the data
and the tape are OK and does not address the fact that after cloning
data corruption could happen just because its a physical medium.

If your conong is to have a copy for longer storage than the original, (
clone and original with different retention time and expiration) then by
all means have a extra copy made.

Hope this helps a bit,

Maarten

On Thursday 19 January 2006 15:42, Kathleen wrote:
> Question...how do you verify the validity of a clone?
>
> If you clone a backup and it clones successfully, then you know you 
> have a good backup.  Does anybody have any tips on how to verify the 
> cloned data?  Would that be another clone?
>
> Just so happens my 'index' from a year end/month-end backup - clone is

> corrupt, got a bad record.  The next index I have is a differential, 
> which if I understand the indexes correctly, the only thing in the 
> differential/incremental index is what was backed up vs that of a FULL

> index which is a copy of the entire index.
>
> Question 2...if I scan the entire save set (excluding the index) can 
> I/will it rebuild the index?
>
> To sign off this list, send email to listserv AT listserv.temple DOT edu and 
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--
Maarten Boot,
Compuware Europe B.V.
Hoogoorddreef 5
1101 BA Amsterdam
Tel: +31 20 312 6511

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