Date: Thu, 11 Jan 2024 23:28:43 -0800 From: Mark Millard <marklmi@yahoo.com> To: "Rodney W. Grimes" <freebsd-rwg@gndrsh.dnsmgr.net>, Current FreeBSD <freebsd-current@freebsd.org> Subject: Re: noatime on ufs2 Message-ID: <D413660B-FE31-4B24-A501-20F7A4B65E61@yahoo.com> References: <D413660B-FE31-4B24-A501-20F7A4B65E61.ref@yahoo.com>
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Rodney W. Grimes <freebsd-rwg_at_gndrsh.dnsmgr.net> wrote on
Date: Thu, 11 Jan 2024 17:15:19 UTC :
> > Am 2024-01-10 22:49, schrieb Mark Millard:
> >=20
> > > I never use atime, always noatime, for UFS. That said, I'd never=20=
> > > propose
> > > changing the long standing defaults for commands and calls. I'd =
avoid:
> >=20
> > [good points I fully agree on]
> >=20
> > There's one possibility which nobody talked about yet... changing =
the=20
> > default to noatime at install time in fstab / zfs set.
>=20
> Perhaps you should take a closer look at what bsdinstall does
> when it creates a zfs install pool and boot environment, you
> might just find that noatime is already set everywhere but
> on /var/mail:
>=20
> /usr/libexec/bsdinstall/zfsboot:: ${ZFSBOOT_POOL_CREATE_OPTIONS:=3D-O =
compress=3Dlz4 -O atime=3Doff}
> /usr/libexec/bsdinstall/zfsboot: /var/mail atime=3Don
>=20
> >=20
> > I fully agree to not violate POLA by changing the default to noatime =
in=20
> > any FS. I always set noatime everywhere on systems I take care =
about, no=20
> > exceptions (any user visible mail is handled via maildir/IMAP, not=20=
> > mbox). I haven't made up my mind if it would be a good idea to =
change=20
> > bsdinstall to set noatime (after asking the user about it, and later=20=
> > maybe offer the possibility to use relatime in case it gets=20
> > implemented). I think it is at least worthwile to discuss this=20
> > possibility (including what the default setting of bsdinstall should =
be=20
> > for this option).
>=20
> Little late... iirc its been that way since day one of zfs support
> in bsdinstall.
>=20
> > --=20
> > http://www.Leidinger.net Alexander@Leidinger.net: PGP =
0x8F31830F9F2772BF
> > http://www.FreeBSD.org netchild@FreeBSD.org : PGP 0x8F31830F9F2772BF
The UFS based snapshots are more of a mix. The one that I just dd'd to
media has:
# more /etc/fstab
# Custom /etc/fstab for FreeBSD embedded images
/dev/ufs/rootfs / ufs rw 1 =
1
/dev/msdosfs/EFI /boot/efi msdosfs rw,noatime =
0 0
tmpfs /tmp tmpfs rw,mode=3D1777 0 =
0
/dev/label/growfs_swap none swap sw 0 =
0
So the UFS does not have noatime set up for its mount but the msdosfs
does.
=3D=3D=3D
Mark Millard
marklmi at yahoo.com
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