Date: Thu, 9 May 2013 20:32:34 -0700 From: Freddie Cash <fjwcash@gmail.com> To: Adam Vande More <amvandemore@gmail.com> Cc: Jeremy Chadwick <jdc@koitsu.org>, Benjamin Adams <benjamindadams@gmail.com>, FreeBSD Stable <freebsd-stable@freebsd.org>, Shane Ambler <FreeBSD@shaneware.biz> Subject: Re: recommended memory for zfs Message-ID: <CAOjFWZ7BhSPJ9ukaDHCUJghKmBg72=16qBZpqJ4UabpL=Lfq%2Bw@mail.gmail.com> In-Reply-To: <CA%2BtpaK2mFuwZt8M5N1YDg5gM3u8EkFW3uR%2BdtjXgHabt=hhHHQ@mail.gmail.com> References: <518BA237.3030700@gmail.com> <518C450B.5070809@ShaneWare.Biz> <518C51AF.5050609@gmail.com> <20130510020628.GA98750@icarus.home.lan> <CA%2BtpaK2mFuwZt8M5N1YDg5gM3u8EkFW3uR%2BdtjXgHabt=hhHHQ@mail.gmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
And the "rule of thumb" for dedupe was approx 1 GB of ARC per unique TB of data in the pool (above and beyond your normal ARC requirements). Not 1 GB of RAM per TB of disk in the pool. Very big difference between the two. :) On 2013-05-09 7:14 PM, "Adam Vande More" <amvandemore@gmail.com> wrote: > On Thu, May 9, 2013 at 9:06 PM, Jeremy Chadwick <jdc@koitsu.org> wrote: > > > The advice of "1GB of RAM per 1TB of disk space" is absolute nonsense on > > numerous levels -- whoever gave this advice to Shane either has no > > understanding of how filesystems/ZFS works, or does but chose to > > simplify to the point where they're providing half-ass information. > > IIRC, that used to be the guideline for memory requirements for dedup. > > > > -- > Adam Vande More > _______________________________________________ > freebsd-stable@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org" >
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?CAOjFWZ7BhSPJ9ukaDHCUJghKmBg72=16qBZpqJ4UabpL=Lfq%2Bw>