From owner-freebsd-questions@FreeBSD.ORG Sat Sep 17 12:56:18 2011 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 93922106566B for ; Sat, 17 Sep 2011 12:56:18 +0000 (UTC) (envelope-from c.kworr@gmail.com) Received: from mail-fx0-f54.google.com (mail-fx0-f54.google.com [209.85.161.54]) by mx1.freebsd.org (Postfix) with ESMTP id 1E7FE8FC14 for ; Sat, 17 Sep 2011 12:56:17 +0000 (UTC) Received: by fxg9 with SMTP id 9so3406231fxg.13 for ; Sat, 17 Sep 2011 05:56:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=message-id:date:from:user-agent:mime-version:to:cc:subject :references:in-reply-to:content-type:content-transfer-encoding; bh=xXvRJVbVqVd4ZF0z+Gf8WX8Emd9LdlTD9BS1BSC4OQE=; b=RlIKf6bzH2h1cOdZBhY7FcELSfMzvh/w49UqQ6cJDsnivUt+gUNjmZ+Df8af6yFQi1 jlCcEy4OWKIAy9aP0SSb0vsdpD166qfYve5dhlgldQcUQslr8zfqSci0itbQCh+87M3I xf5Qx19jr7K1M8Sn3IyR6KfesZs1tW1kcsBNc= Received: by 10.223.36.25 with SMTP id r25mr1070606fad.125.1316262284068; Sat, 17 Sep 2011 05:24:44 -0700 (PDT) Received: from limbo.lan ([195.225.157.86]) by mx.google.com with ESMTPS id t19sm14330910faj.23.2011.09.17.05.24.42 (version=SSLv3 cipher=OTHER); Sat, 17 Sep 2011 05:24:43 -0700 (PDT) Message-ID: <4E749188.8050608@gmail.com> Date: Sat, 17 Sep 2011 15:24:40 +0300 From: Volodymyr Kostyrko User-Agent: Mozilla/5.0 (X11; FreeBSD i386; rv:6.0.2) Gecko/20110907 Thunderbird/6.0.2 MIME-Version: 1.0 To: Terje Elde References: <20110916063153.200375qdq59crf8c@mail.top-consulting.net> <32990703-D068-4B0D-AF3A-C1E6EA0A4100@elde.net> In-Reply-To: <32990703-D068-4B0D-AF3A-C1E6EA0A4100@elde.net> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Cc: "freebsd@top-consulting.net" , "freebsd-questions@freebsd.org" Subject: Re: FS of choice for max random iops ( Maildir ) X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 17 Sep 2011 12:56:18 -0000 16.09.2011 16:35, Terje Elde wrote: > Note: you might be in trouble if you loose your ZIL, thus the doubling up. I *think* you can SSD a cache without risking dataloss, but don't take my word for it. Let me summarize this. ZFS will work even without ZIL or cache. Losing ZIL will make you LOSE DATA. It would be last 0 to 30 seconds of work. Losing cache gives you nothing bad. I didn't tested but I think ZFS will panic when losing log device. -- Sphinx of black quartz judge my vow.