Date: Thu, 23 Jan 2020 08:06:59 +0800 From: Ben Woods <woodsb02@gmail.com> To: mike@karels.net Cc: Philip Paeps <philip@freebsd.org>, freebsd-arch@freebsd.org, Conrad Meyer <cem@freebsd.org>, Ed Maste <emaste@freebsd.org> Subject: Re: svn commit: r356758 - in head/usr.sbin/bsdinstall: . scripts Message-ID: <CAOc73CDhPsUkt6aJLSua=9OG5gh_z52qRV0GGMtNaX2=n_5WmQ@mail.gmail.com> In-Reply-To: <202001180116.00I1G705020955@mail.karels.net> References: <CAOc73CB75Szqt95fNcks3x%2BRBEZYGA4eUCBHWa39GMha6enOuA@mail.gmail.com> <202001180116.00I1G705020955@mail.karels.net>
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On Sat, 18 Jan 2020 at 09:16, Mike Karels <mike@karels.net> wrote: > > On Fri, 17 Jan 2020 at 08:21, Ben Woods <woodsb02@gmail.com> wrote: > > > > Perhaps we could simply include a message on that bsdinstall > partitioning > > > mode selection screen that UFS is recommended on systems with < 4 Gb > RAM? > > > > > > I have uploaded a diff for this here: https://reviews.freebsd.org/D23224 > > > Please let me know your thoughts (comments in the phabricator review > would > > be best). > > I think this needs more discussion, preferably on this list. I am not > convinced that systems with as little as 4 GB should use ZFS. Conventional > wisdom on the FreeNAS mailing list says that 8 GB is required for ZFS, > and FreeNAS no longer includes UFS as an option. Conrad suggested a > cutoff of 16 GB; I am happier with 16 GB than 4 GB as a cutoff. Also, > there was mention of auto-tuning for smaller systems; I don't think that > has materialized yet. I'm not sure how plausible that is without knowing > the workload. I use ZFS on a workstation/server with 64 GB that runs 4 > bhyve guests that do things like buildworld. ZFS wants 63 GB for arc_max; > needless to say, I have a tunable set to a much lower value. If tuning > is required, it is unclear that ZFS is a good default. > > Mike > Hi everyone, Before I commit phabricator review D23224, is there any final comments? Particularly on these 2 lines of help-text: msg_partitioning_zfs_help="ZFS is recommended if you have at least 4GB RAM" msg_partitioning_ufs_help="UFS is recommended if you have less than 4GB of RAM" There is some disagree about what these 2 recommendations should be. 4GB was recommended by: imp, emaste, philip, eugen, dteske 8GB was recommended by: mike 16GB was recommended by: cem The 4GB limit seems to have the best consensus, however there was some debate about whether ZFS is recommended on a system with 4GB, or only systems with MORE THAN 4GB. As for the ZFS auto-tuning, I see that as being a separate discussion (which could ultimately change this recommendation, but shouldn't prevent us from committing this help text now). Regards, Ben -- From: Benjamin Woods woodsb02@gmail.com
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