Re: [gentoo-user] What can I use for a compressed file system?

[William Kenworthy]

When I read the docs, squasfs is read only, and you need at least the
uncompressed space to create the image ... not useful here.

BillK


On Fri, 2006-05-12 at 05:17 -0400, ted leslie wrote:
>
> since you are not looking at writing to this fs,
> then you can use cloop or squashfs
>
> for example, gentoo uses squashfs for its live cd/dvd
>
> squashfs is considered better, but both are in use on live cd/dvd,
> cloop was (At least partially) written by the knoppix dude.
>
> typically you get 2.5:1 compression with these over a general linux distro file average.
>
> either one will put all files starting at a root path into the compressed structure.
> The only real difference between doing it cloop/squashfs and tar.*z
> is that cloop/squashfs can be directly accessed (once mounted),
> which might be of some use.
>
> big negative (unless fixed in recent releases) is you need enough ram/VM to hold the entire
> fs (to be compressed) in memory. So if you have 512MB ram and a 1GB VM allocation,
> the biggest fs you can archive using cloop/squashfs would be 2.5GB (approx), that compresses down to
> the 1GB to fit into your VM.
>
> pretty recent cloop souce is at knoppix web site,
> squashfs, IIRC is at kernel.org
> squashfs would also be available in gentoo, as gentoo uses it in their live cd.
>
> -tl
>
> On Fri, 12 May 2006 02:47:56 -0500
> Zac Slade <krakrjak@××××××××××.net> wrote:
>
> > On Thursday 11 May 2006 19:51, W.Kenworthy wrote:
> > > What can I use for a compressed file system?  I am looking at setting up
> > > a loopback mounted filesystem that I want to use to store backups into.
> > > Compression is needed as space will become a limitation in the future (I
> > > want to do a whole system backup that so far is 2:1 compressed via
> > > tar.bzip2.  I am thinking of using dirvish into a compressed loopback
> > > mount - but how do I set up a compressed fs?
> > Have you tried reiserfs?  As long as it is NOT mounted with the "notail"
> > option it can sometimes save 50% on space compared to ext3/jfs/xfs depending
> > on your usage.
> >
> > There is also a possiblility of using LVM2 snapshots also if you have LVM2
> > devices already set up.  I'm not sure how dirvish is for backup and I'm not
> > sure how good a loopback backup to a file really is anyway.  That depends on
> > the consistency of at least a partition anyway.  Maybe you are trying to
> > solve the wrong problem?
> >
> > --
> > Zac Slade
> > krakrjak@××××××××××.net
> > ICQ:1415282 YM:krakrjak AIM:ttyp99
> > --
> > gentoo-user@g.o mailing list
> >
-- 
William Kenworthy <billk@×××××××××.au>
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