Re: noatime on ufs2

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:
> > 
> > > I never use atime, always noatime, for UFS. That said, I'd never 
> > > propose
> > > changing the long standing defaults for commands and calls. I'd avoid:
> > 
> > [good points I fully agree on]
> > 
> > There's one possibility which nobody talked about yet... changing the 
> > default to noatime at install time in fstab / zfs set.
> 
> 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:
> 
> /usr/libexec/bsdinstall/zfsboot:: ${ZFSBOOT_POOL_CREATE_OPTIONS:=-O compress=lz4 -O atime=off}
> /usr/libexec/bsdinstall/zfsboot: /var/mail atime=on
> 
> > 
> > I fully agree to not violate POLA by changing the default to noatime in 
> > any FS. I always set noatime everywhere on systems I take care about, no 
> > exceptions (any user visible mail is handled via maildir/IMAP, not 
> > mbox). I haven't made up my mind if it would be a good idea to change 
> > bsdinstall to set noatime (after asking the user about it, and later 
> > maybe offer the possibility to use relatime in case it gets 
> > implemented). I think it is at least worthwile to discuss this 
> > possibility (including what the default setting of bsdinstall should be 
> > for this option).
> 
> Little late... iirc its been that way since day one of zfs support
> in bsdinstall.
> 
> > -- 
> > 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=1777    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.

===
Mark Millard
marklmi at yahoo.com