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тАО08-08-2002 06:54 AM
тАО08-08-2002 06:54 AM
DDS tape size
Also is it possible to find the size of the data stored on the tape?
Kapil
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тАО08-08-2002 06:57 AM
тАО08-08-2002 06:57 AM
Re: DDS tape size
The capacity depends on the DDS type I,II,III and the compress ratio of your data. This apears in the cover of the tape.
I you have information in the tape stored by a tar you can do a tar tvf in order to extract the directory and the tape blocks by file.
Regards,
Justo.
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тАО08-08-2002 06:59 AM
тАО08-08-2002 06:59 AM
Re: DDS tape size
dd if=/dev/rmt/
This will read the tape in 1 MB blocks and at the end will say;
xxxx blocks in
xxxx blocks out
The xxxx is how many MB on the tape.
As for estimating the capacity of the tape its best to stick to the uncompressed limits first; eg. DDS2 with 120M tape = 4GB, but with 2:1 compression you can get 8GB. The only way to see how much your data will compress down to (eg. ascii text files will compress over 10:1 but movies or jpegs will not even compress at 2:1) is to do a test write to tape and see how many blocks get written before it fails (fbackup will tell you).
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тАО08-08-2002 07:03 AM
тАО08-08-2002 07:03 AM
Re: DDS tape size
You can use the dd command if=/dev/null bs=64k
to determine the capacity if you disable compression.
cpio, frestore, & tar all have commands to list the contents of a tape so that you can see how much data is stored. You would need a bit of awk or perl to add up the file totals.
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тАО08-08-2002 07:05 AM
тАО08-08-2002 07:05 AM
Re: DDS tape size
DDS 2: 4GB
DDS 3: 12GB
DDS 4: 20GB
These figures are for uncompressed data.
Pete
Pete
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тАО08-08-2002 05:01 PM
тАО08-08-2002 05:01 PM
Re: DDS tape size
Hope this helps.
-- Rod Hills