Date: Mon, 4 Apr 2016 21:38:16 -0400 From: "Tenzin W. Lhakhang" <tenzin.lhakhang@gmail.com> To: Miroslav Lachman <000.fbsd@quip.cz> Cc: 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: <D7F2C273-66A6-49B5-B653-16122910DEB4@gmail.com> In-Reply-To: <570311C5.4010702@quip.cz> References: <34DB45E8-7E1F-4D7C-96FF-E0A403EE8000@omnigroup.com> <570311C5.4010702@quip.cz>
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The most I have seen is approximately 10,000. The performance isn't too bad at that scale. The clone fs metadata becomes a= bit costly. I seen pretty deep nesting into the zfs dataset chains on cert= ain server types; dataset clone snap clone snap chains going about 30 levels= . Note: we are running zfs on illumos (Smartos) General system specs are: e5-26[89]0v2,256gb ram, 1-2 ZIL and ssd or spinni= ng with 4-6 ssd cache drives. Tenzin Sent from my iPhone > On Apr 4, 2016, at 9:15 PM, Miroslav Lachman <000.fbsd@quip.cz> wrote: >=20 > Wim Lewis wrote on 04/05/2016 02:38: >> I'm curious how many ZFS filesystems are reasonable to have on a single m= achine (in a single zpool). We're contemplating a design in which we'd have t= ens of thousands, perhaps a couple hundred thousand, filesystems mounted out= of the same pool. Before we go too far into investigating this idea: Does a= nyone have real-world experience doing something like that? Is it a situatio= n that ZFS-on-FreeBSD is engineered to handle with good performance? Is ther= e a rough estimate of the resources consumed per additional filesystem (in t= erms of kernel VM and disk space)? >>=20 >> Thanks for any insight or advice (even, or especially, if the answer is "= that's crazy, don't do that" :) ) >=20 > I donn't know about how many filesystems but I know that few hundereds of s= napshots can make a noticeable slowdown for some zfs operations. > I think that basic "zfs list" will be painfully slow with tens of thousand= s of filesystems. >=20 > Miroslav Lachman > _______________________________________________ > freebsd-fs@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-fs > To unsubscribe, send any mail to "freebsd-fs-unsubscribe@freebsd.org"
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