Date: Wed, 14 Jan 2015 17:38:49 +0100 From: Albert Shih <Albert.Shih@obspm.fr> To: Linda Kateley <lkateley@kateley.com> Cc: freebsd-fs@freebsd.org Subject: Re: How many ram... Message-ID: <20150114163849.GA97640@pcjas.obspm.fr> In-Reply-To: <54B528AC.9090901@kateley.com> References: <20150113105240.GA33162@pcjas.obspm.fr> <54B528AC.9090901@kateley.com>
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Le 13/01/2015 à 08:16:12-0600, Linda Kateley a écrit > Jas, > > Most of those rules of thumbs are not valid. ZFS doesn't really need to > keep data about metadata in ram. It keeps recently used and frequently > used items in cache. There are some per disk caches but by default those > are pretty small. > > I have a blog on a group that has a 350TB archive/backup system with > 32GB ram. http://kateleyco.com/?p=815 That's very conforting ;-) That's mean I didn't need to by 1To of Ram when I go to 1Po file server. > > Everything is dependent on use case. If you have many users all using > the same file, frequently.. that will be cached. Sizing workload helps. Thanks you to everyone. Regards. JAS -- Albert SHIH DIO bâtiment 15 Observatoire de Paris 5 Place Jules Janssen 92195 Meudon Cedex France Téléphone : +33 1 45 07 76 26/+33 6 86 69 95 71 xmpp: jas@obspm.fr Heure local/Local time: mer 14 jan 2015 17:35:13 CET
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