Date: Sun, 14 Jul 2019 07:10:26 +0200 From: hw <hw@adminart.net> To: "Kevin P. Neal" <kpn@neutralgood.org> Cc: "Clay Daniels Jr." <clay.daniels.jr@gmail.com>, freebsd-questions@freebsd.org Subject: Re: dead slow update servers Message-ID: <87v9w58apd.fsf@toy.adminart.net> In-Reply-To: <20190714011303.GA25317@neutralgood.org> (Kevin P. Neal's message of "Sat, 13 Jul 2019 21:13:03 -0400") References: <87sgrbi3qg.fsf@toy.adminart.net> <20190712171910.GA25091@neutralgood.org> <871ryuj3ex.fsf@toy.adminart.net> <CAGLDxTW8zw2d%2BaBGOmBgEhipjq6ocn536fH_NScMiDD7hD=eSw@mail.gmail.com> <874l3qfvqw.fsf@toy.adminart.net> <20190714011303.GA25317@neutralgood.org>
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"Kevin P. Neal" <kpn@neutralgood.org> writes: > On Sat, Jul 13, 2019 at 05:39:51AM +0200, hw wrote: >> ZFS is great when you have JBODs while storage performance is >> irrelevant. I do not have JBODs, and in almost all cases, storage >> performance is relevant. > > Huh? Is a _properly_ _designed_ ZFS setup really slower? A raidz > setup of N drives gets you the performance of roughly 1 drive, but a > mirror gets you the write performance of a titch less than one drive > with the read performance of N drives. How does ZFS hurt performance? Performance is hurt when you have N disks and only get the performance of a single disk from them. Mirroring the N disks would require another N disks, which you don't have. "Performance" isn't much better defined as "properly designed" here. In practise, I prefer a hardware RAID5 with N disks over a raidz with N disks and a RAID10 over a RAID5. Unfortunately, in practise, the number of disks is limited because they aren't cheap and because only so many disks can be connected to a machine without further ado while there is a certain requirement for storage capacity. Reality is not proper designed :/ What do you do when you put FreeBSD on a server that has a hardware RAID controller which doesn't do JBOD? Use ZFS on the RAID?
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