Date: Tue, 05 Apr 2016 03:15:49 +0200 From: Miroslav Lachman <000.fbsd@quip.cz> To: Wim Lewis <wiml@omnigroup.com>, "freebsd-fs@FreeBSD.org" <freebsd-fs@freebsd.org> Subject: Re: ZFS pool with a large number of filesystems Message-ID: <570311C5.4010702@quip.cz> In-Reply-To: <34DB45E8-7E1F-4D7C-96FF-E0A403EE8000@omnigroup.com> References: <34DB45E8-7E1F-4D7C-96FF-E0A403EE8000@omnigroup.com>
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Wim Lewis wrote on 04/05/2016 02:38: > I'm curious how many ZFS filesystems are reasonable to have on a single machine (in a single zpool). We're contemplating a design in which we'd have tens of thousands, perhaps a couple hundred thousand, filesystems mounted out of the same pool. Before we go too far into investigating this idea: Does anyone have real-world experience doing something like that? Is it a situation that ZFS-on-FreeBSD is engineered to handle with good performance? Is there a rough estimate of the resources consumed per additional filesystem (in terms of kernel VM and disk space)? > > Thanks for any insight or advice (even, or especially, if the answer is "that's crazy, don't do that" :) ) I donn't know about how many filesystems but I know that few hundereds of snapshots can make a noticeable slowdown for some zfs operations. I think that basic "zfs list" will be painfully slow with tens of thousands of filesystems. Miroslav Lachman
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