From owner-freebsd-fs@FreeBSD.ORG Sat Sep 18 00:51:41 2010 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 4E054106564A for ; Sat, 18 Sep 2010 00:51:41 +0000 (UTC) (envelope-from jhellenthal@gmail.com) Received: from mail-gw0-f54.google.com (mail-gw0-f54.google.com [74.125.83.54]) by mx1.freebsd.org (Postfix) with ESMTP id E3B9E8FC0C for ; Sat, 18 Sep 2010 00:51:40 +0000 (UTC) Received: by gwb15 with SMTP id 15so1119745gwb.13 for ; Fri, 17 Sep 2010 17:51:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:sender:message-id:date:from :user-agent:mime-version:to:cc:subject:references:in-reply-to :x-enigmail-version:content-type:content-transfer-encoding; bh=kMO5UDbKLrYX+Thhr3UUCoBAIE5AhPCsvopkBNwguCk=; b=jhQ7eKvKDYP8spoicbmFXp3Df5SQlI9wi3oFWJaS9ZRAR+pL9FhfDvtX4jX6jOGC64 6d5bypeLAfsePwwHp+zJmieQ5WlHZN6iYvAS2AR5gadJq+AQDe2LUaEZX/QYJ2GAHVgY PDDsz4EOfmVAR7z5+bOp+yH4udU28fI886yYs= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=sender:message-id:date:from:user-agent:mime-version:to:cc:subject :references:in-reply-to:x-enigmail-version:content-type :content-transfer-encoding; b=l12fq1+WOXkMFHNDFKnIPZt9mvrJkGFM0TUOQ5OVBwi1yYYnilVRngiW71Emv+HGmx wp4w5dNxXWyy/R6ULpvWkmSXOTEhoEgxEul+zFbAt8iCSlgrxAgpqNFvtuPmDUgAi6Jc dBPMRPEuj9k2O4lYw64BDCfqwpW2D1tNPexRU= Received: by 10.101.95.9 with SMTP id x9mr6419911anl.36.1284771099919; Fri, 17 Sep 2010 17:51:39 -0700 (PDT) Received: from centel.dataix.local (adsl-99-181-146-122.dsl.klmzmi.sbcglobal.net [99.181.146.122]) by mx.google.com with ESMTPS id w6sm7028101anb.23.2010.09.17.17.51.37 (version=SSLv3 cipher=RC4-MD5); Fri, 17 Sep 2010 17:51:38 -0700 (PDT) Sender: "J. Hellenthal" Message-ID: <4C940D18.30808@DataIX.net> Date: Fri, 17 Sep 2010 20:51:36 -0400 From: jhell User-Agent: Mozilla/5.0 (X11; U; FreeBSD i386; en-US; rv:1.9.2.9) Gecko/20100917 Lightning/1.0b1 Thunderbird MIME-Version: 1.0 To: Bryan Drewery References: <4C9385B0.2080909@shatow.net> <20100917161847.GA58503@icarus.home.lan> <20100917163732.GA59537@icarus.home.lan> <4C939B47.6030701@shatow.net> <4C939BF8.7060105@shatow.net> In-Reply-To: <4C939BF8.7060105@shatow.net> X-Enigmail-Version: 1.1.2 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: freebsd-fs@freebsd.org Subject: Re: what happens to pool if ZIL dies on ZFS v14 X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 18 Sep 2010 00:51:41 -0000 On 09/17/2010 12:48, Bryan Drewery wrote: >> >> The ZIL is still used even without a dedicated log device. Disabling >> it is *stupid* in most cases. >> Same goes for disabling the ARC. >> >> There is a lot of FUD out there regarding ZFS tuning. The bottom line: >> don't tune; add more RAM. >> > http://www.solarisinternals.com/wiki/index.php/ZFS_Evil_Tuning_Guide#Disabling_the_ZIL_.28Don.27t.29 > This article is what I think of every time I see a user say they need to get a bigger ZIL vdev or slog in other terms. Ive seen people solely buy a 200GB drive just for the purpose of a slog. This is a sheer waste. If your going to buy drive or even use an existing one then partition that drive with one partition of 512MB, which you will never get to the end of, and then use the rest for a quick backup drive. -- jhell,v