From owner-freebsd-hackers@FreeBSD.ORG  Sat Oct 25 09:18:38 2008
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 546411065676;
	Sat, 25 Oct 2008 09:18:38 +0000 (UTC)
	(envelope-from danny@cs.huji.ac.il)
Received: from cs1.cs.huji.ac.il (cs1.cs.huji.ac.il [132.65.16.10])
	by mx1.freebsd.org (Postfix) with ESMTP id 082538FC14;
	Sat, 25 Oct 2008 09:18:37 +0000 (UTC)
	(envelope-from danny@cs.huji.ac.il)
Received: from sunfire.cs.huji.ac.il ([132.65.16.80])
	by cs1.cs.huji.ac.il with esmtp
	id 1KtfI4-000BoP-Dn; Sat, 25 Oct 2008 11:18:36 +0200
X-Mailer: exmh version 2.7.2 01/07/2005 with nmh-1.2
To: Jeremy Chadwick <koitsu@FreeBSD.org>
In-reply-to: <20081025075543.GA55339@icarus.home.lan> 
References: <E1KtIbt-000PhA-HW@cs1.cs.huji.ac.il>
	<20081024150916.GB41283@dan.emsphone.com>
	<E1Ktdsd-000B7U-5M@cs1.cs.huji.ac.il>
	<20081025075543.GA55339@icarus.home.lan>
Comments: In-reply-to Jeremy Chadwick <koitsu@FreeBSD.org>
	message dated "Sat, 25 Oct 2008 00:55:43 -0700."
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Date: Sat, 25 Oct 2008 11:18:36 +0200
From: Danny Braniss <danny@cs.huji.ac.il>
Message-ID: <E1KtfI4-000BoP-Dn@cs1.cs.huji.ac.il>
Cc: FreeBSD Hackers <freebsd-hackers@freebsd.org>,
	Dan Nelson <dnelson@allantgroup.com>
Subject: Re: zfs & waiting on zio->io_cv 
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
	<freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>, 
	<mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sat, 25 Oct 2008 09:18:38 -0000

[...]
> > I guess this beast needs some tunning, are there any tools out there
> > to monitor/tune ZFS? 
> 
> Monitor ZFS: sysctl
> Tune ZFS: vi /boot/loader.conf or sysctl 

> 
> I'm not sure what you're looking for.  :-)

	the magic wand :-)

/OT
there's an old saying, numbers don't lie, only _____.
[you can fill the _____ with whatever, I like 'salesperson']
update: ____ should be wall-street-analysts
/OT/

there are too many tunables, and I really don't want to spend all my waking
hours tunning, but once in a while, I do check performance, and running
top, iostat, nfsstat, etc, sometimes show a 'congestion'.
the problem I encounter very often, is that what is a great solution for one,
might be disastrous for another.

ZFS is the new kid in town, and so far I am quiet happy - have 2 in production,
and the new one will be very soon, it's being used to train/learn/play but will
go online very soon, then it will be hammered by several projects, and it
would-be-nice to have some tool to watch performance and be able to do some
tunning, to quote tunefs:
	'You can tune a file system, but you cannot tune a fish.'

babbling on a rainy day,
	danny