Richard Fish write:
> From what I can tell, there are no really good compressing filesystems
available currently.

I would disagree, Squashfs is an advanced read-only compressing filesystem,
which uses numerous techniques to obtaIn high compression ratios while also
being fast.  Some of the techniques (compressed metadata, use of fragment
blocks, indexed compressed directories) I doubt you'll find many places
elsewhere irrespective of the operating system.

What I would agree with is there is no commercial support for compressing
filesystems, which at a time where the major improvements to the Linux
kernel are (arguably) being driven by the Linux distribution vendors, is a
major limitation.  Unfortunately, embedded systems vendors tend to simply
use what is there, and the others are mainly focussed on the enterprise
which is why there's a lot of enterprise scale and clustering filesystems
about.

> But why do you need to do this in the filesystem?  Why not use a
> compressible format for your backups like tar, cpio, or (my favorite)
> dar? 

So you can mount the filesystem and transparently access the files as if
they were uncompressed.

Phillip Lougher

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