Date: Tue, 13 Jan 2015 15:05:12 +0000 (GMT) From: andy thomas <andy@time-domain.co.uk> To: Albert Shih <Albert.Shih@obspm.fr> Cc: freebsd-fs@freebsd.org Subject: Re: How many ram... Message-ID: <Pine.GSO.4.64.1501131457220.4731@mail.time-domain.co.uk> In-Reply-To: <20150113105240.GA33162@pcjas.obspm.fr> References: <20150113105240.GA33162@pcjas.obspm.fr>
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On Tue, 13 Jan 2015, Albert Shih wrote: > Hi all, > > Basic question : How many amount of ram I need for running ZFS with a pool > of ~500-600To. > > For example If I've a server with 2 disk array of 60 disk of 6To. > > Is the rule I find somewhere on Internet saying for ZFS 1To --> 1Go is > still true ? I've have been running lots of HP Microservers fitted with 4 x 4 Tb disks in ZFS RAIDz1 under 8 GB of RAM for the past 3 years or so with no problems at all. I've also got a SAN with 8 GB memory in the head node and 6 servers - each with 4 x 4 TB disks, RAIDz1 and 8 GB memory - attached as iSCSI VDEVs for a usable capacity of 50 TB. Again with no problems at all. Both set-ups break most of the rules in the rule-book but... it works! Andy ---------------------------- Andy Thomas, Time Domain Systems Tel: +44 (0)7866 556626 Fax: +44 (0)20 8372 2582 http://www.time-domain.co.uk
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