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Date:      Tue, 29 Jul 2014 12:07:53 -0400
From:      Paul Kraus <paul@kraus-haus.org>
To:        "freebsd-questions@freebsd.org" <freebsd-questions@freebsd.org>
Subject:   Re: deciding UFS vs ZFS
Message-ID:  <055DBC99-E2BB-4B45-96EB-2D79C067F7EF@kraus-haus.org>
In-Reply-To: <CALfReyes0z8DGPPr+V52-UfdxokZ2FDaWUCOU2Hn6WTGNQrBAw@mail.gmail.com>
References:  <20140713190308.GA9678@bewilderbeast.blackhelicopters.org> <20140714071443.42f615c5@X220.alogt.com> <53C326EE.1030405@my.hennepintech.edu> <20140714111221.5d4aaea9@X220.alogt.com> <20140715143821.23638db5@gumby.homeunix.com> <CALfReyf8Rg7rCcob4jSk9XbPLY0MpP52jno9vZ0GUFQGS0Vy-A@mail.gmail.com> <20140716143929.74209529@gumby.homeunix.com> <CALfReycWppVY5BYHeqvunvnUDtwPAke5vug0Kik2_JTnvvfArQ@mail.gmail.com> <20140718180416.715cdc0b@gumby.homeunix.com> <CALfReycMdd-jNvRaiyXO4A=C3eFwuugL74HNoKyb2q4um1L5pg@mail.gmail.com> <20140722133305.228a1690@gumby.homeunix.com> <8699AF5D2BE8E9EBCFFEEE17@192.168.1.50> <20140722222722.70f13ec9@gumby.homeunix.com> <C9D2EE68EC3894786D119AFD@192.168.1.50> <20140724002912.5eda1757@gumby.homeunix.com> <98DFE7A36ED2EBA26E6C710C@192.168.1.50> <EF37D3F4-2B8E-4695-8C75-8ADEE0F91F5A@mac.com> <CALfReycKiTm74a0wy=K+ZhyXxVBHyNwedy4SOvw3_UUYnZaMbA@mail.gmail.com> <D0317537-792D-4344-936B-867125B82F7D@mac.com> <CALfReyes0z8DGPPr+V52-UfdxokZ2FDaWUCOU2Hn6WTGNQrBAw@mail.gmail.com>

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>> Assuming you mean ProLiant 712317-001 Ultra Micro Tower Server, those =
cost
>> around $400 with 2GB of RAM.  1GB/TB of RAM to storage, it will need =
more
>> RAM according to:
>> "A general rule of thumb is 1GB of RAM for every 1TB of storage.=94
>> https://www.freebsd.org/doc/handbook/filesystems-zfs.html

That is an overly generic recommendation. For the ZFS ARC to be of any =
real use you really need a minimum of 2GB RAM. The 1GB per 1TB =
recommendation is a bastardization of the recommendation from the =
ZFS-List. If you enable Dedupe it should really be a REQUIREMENT to have =
1GB FRRE RAM for each 1TB of NET storage.

Having said that, the more RAM you can throw at ZFS (and the ARC) the =
better off you will be for any configuration. It all depends on your =
workload.

--
Paul Kraus
paul@kraus-haus.org




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