From owner-freebsd-fs@freebsd.org Mon Sep 21 12:58:15 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 D88D4A05021 for ; Mon, 21 Sep 2015 12:58:15 +0000 (UTC) (envelope-from kraduk@gmail.com) Received: from mail-wi0-x232.google.com (mail-wi0-x232.google.com [IPv6:2a00:1450:400c:c05::232]) (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 758CF15DD for ; Mon, 21 Sep 2015 12:58:15 +0000 (UTC) (envelope-from kraduk@gmail.com) Received: by wicgb1 with SMTP id gb1so113589149wic.1 for ; Mon, 21 Sep 2015 05:58:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; bh=7NO9e2RM44KOcLiX21rqyWNjYZdBZI6oqxjsBAQBfe8=; b=w8n0APOicXTiFa+gCfDe33P9Z6X5dJreeGcilwKcrME70IHhVUfuOPZS07Wymt1Wie cufJyTILZT6FvTxR28dN7EMgga3wtmEirbu01N4fQMaEz7ww8WLfxffKiQaglsCveoHo 0NptaWTZ6AAkfXFZ2Av6easq0mGIiLeVwBdBuCFzr1OJAGI+7kvzzINfEv2J2Sv9KfMF yeRrVoWelf1GIElcx4O4wx8X9GvIq2EtfG+uypEpnNt9CypF9MiXkWWHSps/Z213NM17 9yiMVAzJylOX4ACm+OlaPQhTnoLYOqc/pLPtqsloTKYCEUr4KuaYefAZpt8JRCSzcvS+ 0KCg== MIME-Version: 1.0 X-Received: by 10.180.104.40 with SMTP id gb8mr13646195wib.17.1442840293969; Mon, 21 Sep 2015 05:58:13 -0700 (PDT) Received: by 10.28.125.18 with HTTP; Mon, 21 Sep 2015 05:58:13 -0700 (PDT) In-Reply-To: References: Date: Mon, 21 Sep 2015 13:58:13 +0100 Message-ID: Subject: Re: ZFS cpu requirements, with/out compression and/or dedup From: krad To: Sami Halabi Cc: FreeBSD FS Content-Type: text/plain; charset=UTF-8 X-Content-Filtered-By: Mailman/MimeDel 2.1.20 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: Mon, 21 Sep 2015 12:58:15 -0000 An atom with 2gb of ram in theory is fine to run zfs. What is more important is the workload. If you are going to have 100k iops a second, with lots of synchronous writes then you are going to struggle with an atom, and will need something a lot more beefy. I have a custom built router based on an atom, running zfsonroot freebsd 10.2 backed via an ssd. It runs squid, dns, vpn, dhcp, ip6tunnel, and a small website for about 8 users, and it handles this fine. However there is no massive disk io going on even when we are all heavily browsing. If I tried to use the same hardware for an esx datastor running over iscsi, i would expect it to get a little stressed. On 19 September 2015 at 12:56, 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" >