Date: Wed, 14 Jan 2015 10:50:18 -0600 From: Linda Kateley <lkateley@kateley.com> To: Albert Shih <Albert.Shih@obspm.fr> Cc: freebsd-fs@freebsd.org Subject: Re: How many ram... Message-ID: <54B69E4A.9010402@kateley.com> In-Reply-To: <20150114163849.GA97640@pcjas.obspm.fr> References: <20150113105240.GA33162@pcjas.obspm.fr> <54B528AC.9090901@kateley.com> <20150114163849.GA97640@pcjas.obspm.fr>
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I will say one more thing.. I also have a customer who uses zfs for security camera storage. The cameras deliver 100's of k bytes per minute... But they save the data for a very very very long time. That kind of system would need very little ram(maybe 8GB) but lots and lots of disk. lk On 1/14/15 10:38 AM, Albert Shih wrote: > 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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