On Wed, Jan 20, 2010 at 12:42:35PM -0500, Wajih Ahmed wrote: > Mike, > > Thank you for your quick response... > > Is there a way for me to test the compression from the command line to > see if lzjb is giving me more or less than the 12.5% mark? I guess it > will depend if there is a lzjb command line utility. > > I am just a little surprised because gzip-6 is able to compress it to > 4.4GB from 14GB (and gzip-1 4.8GB) and from what i read lzjb should be > giving me better an 12.5% compression. For example the *compress* > command (which i think uses LZO, a slight different variant of > Lempel-Ziv) manges to reduce it to 8.0GB. That is a 57% ratio.
That's over the whole file as a single compression stream. ZFS has to compress each block (128k or maybe less) independently. This can't do as well. -- Dan.
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