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>
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-----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-----
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