From: Vipin Khushu (vkhushu@GUERNSEYOP.COM)
Date: Wed Nov 26 2003 - 09:13:17 EST
Thanks. I'll give that a whirl.
-----Original Message-----
From: Bill Verzal [mailto:BVerzal@KOMATSUNA.COM]
Sent: Tuesday, November 25, 2003 1:33 PM
To: aix-l@Princeton.EDU
Subject: Re: percentage of 8mm backup tape used
Here is a thought...
Create a compressed filesystem and dd the tape (or copy the files) to the
compressed filesystem. I would guess the compression algorithms are
somewhat similar.
BV
--------------------------------------------------------
"If everything is coming your way, then you are in the wrong lane"
Bill Verzal
AIX Administrator, Komatsu America
(847) 970-3726 - direct
(847) 970-4184 - fax
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Thanks. One of these ought to work.
-----Original Message-----
From: Green, Simon [mailto:Simon.Green@EU.ALTRIA.COM]
Sent: Tuesday, November 25, 2003 5:32 AM
To: aix-l@Princeton.EDU
Subject: Re: percentage of 8mm backup tape used
One way is if whatever backup command you're using reports how much data
has
been written, or has an option to inspect what's on the tape. e.g. "tar
-tvf /dev/rmt0" output will tell you the size of each file backed up, so
you
might knock up a quick script to give you the sum of those. Or you can
collect that information when the backup is created, which would have the
advantage of not having to read the whole tape again. That's going to be
the uncompressed sizes, though.
Another option might be with "dd if=<your backup file> of=/dev/null
ibs=<some value>". That'll give you a record count, which has the
advantage
of being the compressed size. I don't know if you could run it for an
entire tape, or whether you'd have to do it for each file on the tape
individually. You can specify any block size you like, I think: a large
blocksize will run a bit quicker, but give you less precision.
Simon Green
Altria ITSC Europe Ltd
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> -----Original Message-----
> From: Vipin Khushu [mailto:vkhushu@GUERNSEYOP.COM]
> Sent: 24 November 2003 22:06
> To: aix-l@Princeton.EDU
> Subject: percentage of 8mm backup tape used
>
>
> Anybody know of a way to determine what percentage / how much
> of a tape has
> been used up during a backup to determine how much more we
> can throw on to
> the tape?
>
> The media in question is Lexmark (previously IBM) part number 59H2678
> capacity - 20/40GB (uncompressed / compressed), length - 170M.
>
> I looked at the tctl command but nothing stood out.
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