Date: Tue, 04 Sep 2018 03:26:13 +0000 From: bugzilla-noreply@freebsd.org To: standards@FreeBSD.org Subject: [Bug 231129] The ZFS installer sets atime=off by default Message-ID: <bug-231129-99-YZ8HqCCFDb@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-231129-99@https.bugs.freebsd.org/bugzilla/> References: <bug-231129-99@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D231129 Allan Jude <allanjude@FreeBSD.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |allanjude@FreeBSD.org --- Comment #1 from Allan Jude <allanjude@FreeBSD.org> --- There is infact a good reason to disable atime. ZFS is a CoW (Copy-on-Write) filesystem, so when the atime property is set to on, all snapshots will gro= w as the atime attribute of each object is modified. This causes what are suppos= ed to be zero-cost snapshots to resume space, and causes read-only workloads to generate amplification as additional metadata must be read for it to be upd= ated to be written out with a modified atime and the checksum of the entire tree= of blocks to be updated. The 'zfs auto' part of the installer sets atime on ZFS to disabled on purpo= se, for all datasets other than /var/mail. --=20 You are receiving this mail because: You are the assignee for the bug.=
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