From owner-freebsd-fs@freebsd.org Fri Oct 2 12:46:58 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 A3504A0C76D for ; Fri, 2 Oct 2015 12:46:58 +0000 (UTC) (envelope-from wjw@digiware.nl) Received: from smtp.digiware.nl (smtp.digiware.nl [31.223.170.169]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 667AC1C23 for ; Fri, 2 Oct 2015 12:46:58 +0000 (UTC) (envelope-from wjw@digiware.nl) Received: from rack1.digiware.nl (unknown [127.0.0.1]) by smtp.digiware.nl (Postfix) with ESMTP id 382B8153416; Fri, 2 Oct 2015 14:46:52 +0200 (CEST) X-Virus-Scanned: amavisd-new at digiware.nl Received: from smtp.digiware.nl ([127.0.0.1]) by rack1.digiware.nl (rack1.digiware.nl [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 5NgJxQs3ZRhw; Fri, 2 Oct 2015 14:46:51 +0200 (CEST) Received: from [IPv6:2001:4cb8:3:1:f855:6c07:100f:17f4] (unknown [IPv6:2001:4cb8:3:1:f855:6c07:100f:17f4]) by smtp.digiware.nl (Postfix) with ESMTP id 42634153418; Fri, 2 Oct 2015 14:46:51 +0200 (CEST) Subject: Re: ZFS, Zvol, iSCSI and windows and mostly readonly To: Tom Curry References: <56050EFC.1000303@digiware.nl> <1443179614.5271.42.camel@data-b104.adm.slu.se> <5606EBEA.2090103@digiware.nl> Cc: "freebsd-fs@freebsd.org" From: Willem Jan Withagen Organization: Digiware Management b.v. Message-ID: <560E7CBA.7080807@digiware.nl> Date: Fri, 2 Oct 2015 14:46:50 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0 MIME-Version: 1.0 In-Reply-To: <5606EBEA.2090103@digiware.nl> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit 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: Fri, 02 Oct 2015 12:46:58 -0000 On 26-9-2015 21:03, Willem Jan Withagen wrote: > On 25-9-2015 16:05, Tom Curry wrote: >> On Fri, Sep 25, 2015 at 7:13 AM, Karli Sjöberg > > wrote: >> >> fre 2015-09-25 klockan 11:08 +0200 skrev Willem Jan Withagen: >> > Hi, >> > >> > Because of the Network Video Recorder (on windows) we use only likes >> > "real" disks, and not SMB disks. We started using ZVOLs which are >> > exported thru iSCSI/ctld.... >> > >> > And that works really well, so there all thumbs up for this combo. Since this data is mainly write-only, and only to be read when old data needs to be reviewed. Which is hardly ever.... Do I, can I do, or should I do, something about that data going into ARC or cache? zfsraid/nvr primarycache all default zfsraid/nvr secondarycache all default With that I mean it only needs to go to disk, until it is deleted about 30 days later, in the time in between the data is not accessed. Now I have the idea that it goes into ARC and puts presure on memory that could be used for other things? --WjW