amrestore and compression
2004-01-21 15:09:55
I'm hoping someone can clear something up for me. Does amrestore
uncompress an image as it restores it? The reason I ask is that I had
an image on an amanda tape that was supposedly compressed via gzip. The
amanda mail report indicated that the original KB was about 5.1Gb, and
Out-KB was about 2.9Gb for a 57% compression. The other image on the
tape was listed with an Out-KB of about 4.3Gb and taper reported having
put 7.2Gb to tape. The math works out.
I just recently did an amrestore on that 5.1-compressed to 2.9Gb image
(by doing amrestore -p, piped through SSH, and then >'d into a file) and
the resulting file was 4.9Gb and not gzipped at all. When I ran that
file through Gzip, it squeezed it down to the familiar 2.9Gb size. So
was the image compressed and amrestore uncompressed it?
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