Date: Wed, 27 May 2015 16:10:50 -0500 From: Brandon Wandersee <brandon.wandersee@zoho.com> To: freebsd-questions@freebsd.org Subject: Re: ZFS in a VM? Message-ID: <20150527211050.GA11054@WorkBox.Home> In-Reply-To: <CD14530C-58EB-4DA4-8DA0-59B3A1711A05@shire.net> References: <CA%2Bsg5RQgF7%2BAQu9P0Bt8USF8722QCi=qJ2XQ8RbNQ92cv9tNTg@mail.gmail.com> <9C96EB4B-A230-4A26-BDC3-067367A61E34@shire.net> <CA%2Bsg5RR29vXowwyhOPOXmNU0ex9XW0fVui2fB1sgdsDPCKZUkg@mail.gmail.com> <CD14530C-58EB-4DA4-8DA0-59B3A1711A05@shire.net>
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On 05/27, Chad Leigh Shire.Net LLC wrote: > > > On May 27, 2015, at 1:41 PM, Jaime Kikpole <jkikpole@cairodurham.org> wrote: > > > > On Wed, May 27, 2015 at 3:39 PM, Chad Leigh Shire.Net LLC > > <chad@shire.net> wrote: > >> I do. I do it not so much for any performance benefits, if any, ZFS offers, but more for data integrity. > > > > Exactly what I was looking for, too. > > > > > >> You need to tune it since the VM based disks are not the same as physical disks. > > > > I'm afraid that I don't understand. Can you explain what you mean by "tune it?" > > There are various kernel “tunables” (aka “kernel state”, settable “variables” in the kernel, see “man sysctl”) that affect ZFS. A lot of tuning "knobs" are described here: http://www.solarisinternals.com/wiki/index.php/ZFS%5FEvil%5FTuning%5FGuide As others have implied/stated, any results you get from a VM (especially after fiddling with tuning) won't accurately reflect anything you'd get from using ZFS on bare metal, and some operations are just out of the question. -- =========================================== :: Brandon Wandersee :: :: brandon.wandersee@zoho.com :: =========================================== "A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools." - Douglas Adams ===========================================
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