Date: Tue, 22 Apr 2003 10:52:22 -0400 (EDT) From: Robert Watson <rwatson@freebsd.org> To: "Wilkinson,Alex" <Alex.Wilkinson@dsto.defence.gov.au> Cc: current@freebsd.org Subject: Re: HEADS UP: UFS2 now the default creation type on 5.0-CURRENT Message-ID: <Pine.NEB.3.96L.1030422104900.85298O-100000@fledge.watson.org> In-Reply-To: <20030422085157.G43433@squirm.dsto.defence.gov.au>
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On Tue, 22 Apr 2003, Wilkinson,Alex wrote: > Can you recommend any papers that explain the differences between UFS1 > and UFS2 ie the benefits ? I don't believe there's a specific paper at this point, although no doubt there will be. The upshots are: o 64-bit pointers up the wazoo o Layout and functional changes to help support variable-size blocks (extent-like allocation) o Extension of various flag fields o Addition of per-inode extended attribute extent o Lazy inode initialization (watch newfs(8) fly) The motivating factor in the layout change was the need for better EA support, and while we were at it we figured we'd do a bunch of other useful things too. UFS2 uses the same basic technologies as modern UFS1 (inodes, linear directory layout, soft updates, snapshotting, background file system checking, etc) so it was a relatively low-risk change. Robert N M Watson FreeBSD Core Team, TrustedBSD Projects robert@fledge.watson.org Network Associates Laboratories
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