Date: Wed, 02 Feb 2022 23:29:46 +0000 From: bugzilla-noreply@freebsd.org To: doc@FreeBSD.org Subject: [Bug 261212] Update the ZFS chapter (20) of the FreeBSD Handbook, and other OpenZFS-related pages Message-ID: <bug-261212-9-k0fKnjnZe9@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-261212-9@https.bugs.freebsd.org/bugzilla/> References: <bug-261212-9@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D261212 Graham Perrin <grahamperrin@gmail.com> changed: What |Removed |Added ---------------------------------------------------------------------------- Summary|Update the ZFS chapter (20) |Update the ZFS chapter (20) |of the FreeBSD Handbook |of the FreeBSD Handbook, | |and other OpenZFS-related | |pages --- Comment #1 from Graham Perrin <grahamperrin@gmail.com> --- Not the FreeBSD Handbook alone =E2=80=A6=20 Manual pages =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D <https://www.freebsd.org/cgi/man.cgi?query=3Dzfs&sektion=3D4&manpath=3DFree= BSD>=20 * finds nothing for zfs(4) in FreeBSD 13.0.=20 Compare with OpenZFS <https://openzfs.github.io/openzfs-docs/man/4/zfs.4.ht= ml>:=20 > zfs =E2=80=94 tuning of the ZFS kernel module For zfs(4) in ports <https://www.freebsd.org/cgi/man.cgi?query=3Dzfs&sektion=3D4&manpath=3DFree= BSD-Ports> =E2=80=93 more specifically, <https://www.freebsd.org/cgi/man.cgi?query=3Dzfs&sektion=3D4&manpath=3DFree= BSD+Ports+13.0> in 'FreeBSD Ports 13.0' =E2=80=93 we have, for example:=20 > zfs_arc_max=3D0B (ulong) There's a corresponding entry in the OpenZFS page for zfs(4).=20 Actual tunables =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D FreeBSD 13.0-RELEASE includes this variable:=20 vfs.zfs.arc.max =E2=80=93 the value of which defaults to:=20 0 The name of the variable in FreeBSD is comparable to the name of the parameter/variable in original OpenZFS documentation. Fair enough.=20 FreeBSD Handbook =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D <https://docs.freebsd.org/en/books/handbook/book/#zfs-advanced-tuning-arc_m= ax> describes this variable, with a different name, which probably predates Ope= nZFS in FreeBSD:=20 vfs.zfs.arc_max No mention of 0 and there's this:=20 > =E2=80=A6 all RAM but 1 GB, or 5/8 of all RAM, whichever is more.=20 > Use a lower value if =E2=80=A6 The word "but" is not ideal ("minus" would be better); and the reader might wonder:=20 Lower than what? --=20 You are receiving this mail because: You are the assignee for the bug.=
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