Xref: utzoo comp.unix.questions:10030 comp.unix.microport:1943
Path: utzoo!attcan!uunet!lll-winken!lll-tis!mordor!joyce!zodiac!ames!mailrus!uflorida!haven!mimsy!jds
From: jds@mimsy.UUCP (James da Silva)
Newsgroups: comp.unix.questions,comp.unix.microport
Subject: Re: dump/restore
Message-ID: <14270@mimsy.UUCP>
Date: 31 Oct 88 22:12:30 GMT
References: <178@celerity.UUCP> <229@dcs.UUCP> <180@celerity.UUCP> <262@mpx2.UUCP>
Reply-To: jds@mimsy.umd.edu (James da Silva)
Organization: University of Maryland, Department of Computer Science
Lines: 25

In article <262@mpx2.UUCP> erik@mpx2.UUCP (Erik Murrey) writes:
>
> ... It also seems to me that it dumps
>disk blocks in order of the disk itself, rather than the order of the
>file.  This means that restoring a filesystem will *not* reduce
>the fragmentation.  (Which is often why I backup/restore in the
>first place.)  ...
>

The BSD dump format goes roughly like this:

	Dump Header
	File Removal List (an inode bitmap)
	File Dump List	  ( " )
	The directories
	The files

The files are dumped in inode order (file with inode 10 is dumped before
inode 11 and so forth), and the files are contiguous rather than
fragmented.

				- Jaime

----------------------------------------------------------------------
usenet:   uunet!mimsy!jds 				James da Silva
internet: jds@mimsy.umd.edu