Date: Wed, 23 Jun 2010 12:06:48 +0100 From: Matthew Seaman <m.seaman@infracaninophile.co.uk> To: Aiza <aiza21@comclark.com> Cc: "questions@freebsd.org" <questions@freebsd.org> Subject: Re: sparse image Message-ID: <4C21EAC8.50402@infracaninophile.co.uk> In-Reply-To: <4C21E163.70003@comclark.com> References: <4C21E163.70003@comclark.com>
next in thread | previous in thread | raw e-mail | index | archive | help
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
On 23/06/2010 11:26:43, Aiza wrote:
> Is there an equivalent of the MAC sparseimage on FreeBSD?
A filesystem image that only takes up as much space as the total of all
the files within it?
Not exactly. There are many archiving formats -- dump, tar, cpio, etc.
etc. which fulfill the space usage criterion, but they aren't filesystem
images in the sense that you could mount them on your system.
Probably the closest thing is to create a .iso image using something
like growisofs(1m) (from the sysutils/dvd+rw-tools port), but while you
can mount a .iso as a file-backed metadevice you can't mount it read/write.
There is the Union FS type -- see mount_unionfs(8) -- where the overlay
layer just contains the changed files made since the filesystem was
mounted. Which is sort-of what you're asking about, but not quite the
same thing.
Cheers,
Matthew
- --
Dr Matthew J Seaman MA, D.Phil. 7 Priory Courtyard
Flat 3
PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate
JID: matthew@infracaninophile.co.uk Kent, CT11 9PW
-----BEGIN PGP SIGNATURE-----
Version: GnuPG/MacGPG2 v2.0.14 (Darwin)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/
iEYEARECAAYFAkwh6sgACgkQ8Mjk52CukIwnygCff0nTR8a2JVstLTO02f3Fm48w
IMAAnisQv09vAHlgaTRXvIKRgvNeh4Ga
=ggfk
-----END PGP SIGNATURE-----
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?4C21EAC8.50402>