From owner-freebsd-fs@freebsd.org Sun Sep 20 20:03:54 2015 Return-Path: Delivered-To: freebsd-fs@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 6AEECA05C64 for ; Sun, 20 Sep 2015 20:03:54 +0000 (UTC) (envelope-from lkateley@kateley.com) Received: from mail-io0-f176.google.com (mail-io0-f176.google.com [209.85.223.176]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 3BC601346 for ; Sun, 20 Sep 2015 20:03:53 +0000 (UTC) (envelope-from lkateley@kateley.com) Received: by iofb144 with SMTP id b144so102167986iof.1 for ; Sun, 20 Sep 2015 13:03:47 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:reply-to:subject:references:to:from:organization :message-id:date:user-agent:mime-version:in-reply-to:content-type :content-transfer-encoding; bh=3j9+zWIHdVD8Mq0tgt1GUw/b/2P022CNOImyyJIfmtg=; b=nCvmMl0swtM78drKqEA5+9jLSf5khaJuD6Q30/VRkQQI4bSONjB2nJlR9GX2LDnbbz WaKRpgewqQVbSPO+UDUrDZlY1MNu0G1xspSLJkM+UyjmfH3CMJllRRI1BYE4IEzR25BT mCX/AsbqCF2VAZGlCWnhCHpWvrIj1CHVdFxEjb+JJoDtbXbf0Z3WaOxJ+B35uazDQ+2i 4yX8/Oo8O1q7jSdhS9U4jkiKJkWQYWdHNpJpUfgz/Sk4vEZUxevNEC9+9ezxCAX79ZZQ MzqxWkHLisKP1N5YMs2RvqY11BKZ8t6m7uFNE0uEKwnGpEVRp2MClnJgXH0KG9GBaAeu wYDg== X-Gm-Message-State: ALoCoQl33QB3+u+f2Yn29IhjOPI2F8t+vRFBA/CjZM+e4LF9QusBLCaIyZPn1HrQcqMIrd+WkMAJ X-Received: by 10.107.160.82 with SMTP id j79mr24019741ioe.18.1442779427751; Sun, 20 Sep 2015 13:03:47 -0700 (PDT) Received: from [192.168.0.18] ([63.231.252.189]) by smtp.googlemail.com with ESMTPSA id c97sm8627782ioj.41.2015.09.20.13.03.44 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 20 Sep 2015 13:03:47 -0700 (PDT) Reply-To: linda@kateley.com Subject: Re: ZFS cpu requirements, with/out compression and/or dedup References: To: freebsd-fs@freebsd.org From: Linda Kateley Organization: Kateley Company Message-ID: <55FF111A.4040300@kateley.com> Date: Sun, 20 Sep 2015 15:03:38 -0500 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:38.0) Gecko/20100101 Thunderbird/38.2.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 20 Sep 2015 20:03:54 -0000 I usually don't worry about CPU much until i start running alot of IO, network or disk. Dedup takes a ton of memory too. Any algorithm for TB's of storage and cpu/ram is usually wrong. CPU and memory are important by data coming in and out.. not data at rest. What kind of data? On 9/19/15 6:56 AM, Sami Halabi wrote: > Hi everyone, > I've been searching the documentation, wiki.. etc. but found no rule of > thumb to CPU requirements to run ZFS fs. for memory there are few rules > according to using dedup or not. > > rules of thumb I concluded are so far: > 1. use compression lz4. > 2. use checksum. > 3. disable atime. > > from what i read the status of dedup is not that clear and seems there are > bugs and better to avoid it? > > so according to 1-3 above what cpu requirements i need? is ATOM cpu like > supermicro c2750/3/5/8 enough to run system of 20TB /40TB with 1-3 above? > if dedup IS enabled would it still work fine? > > Thanks in advance, > Sami halabi > _______________________________________________ > 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"