Messages in this thread | | | Date | Wed, 30 Oct 2002 15:10:01 +0000 | From | Padraig Brady <> | Subject | Re: ANNOUNCEMENT: Squashfs released (a highly compressed filesystem) |
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Jesse Pollard wrote: > On Tuesday 29 October 2002 10:11 pm, Larry McVoy wrote: > >>>A r/w compressed filesystem would be darned useful too :) >> >>mmap(2) is, err, hard. Not impossible, it means the file system has to >>support both compressed and uncompressed files, but it's interesting. > > You can also think of it as a step toward a hierarchical filesystem with the > files: > 1. uncompressed (with uncompressed inode) > 2. compressed on line (real disk space allocated) > 3. compressed nearline (only compressed inode on disk, with a > reference to offline storage) > > Obviously this is only for very large filesystems (we have one FS that > is currently between 100-200 TB in size when you include the migrated > storage).
I think it's worth referencing e2compr here also, which is a patch that provides transparent compression for ext2 (& ext3?). Denis RICHARD (CC'd) is maintaining the 2.4 implementation. I've version 0.4.42 (against 2.4.16) mirrored here: http://www.iol.ie/~padraiga/patches/e2compr-0.4.42-patch-2.4.16.gz
Note I've used it without problems (to access filesystems created with the kernel 2.2 version) here: http://cvs.bofh.asn.au/e2compr/
Pádraig.
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