From owner-freebsd-fs@freebsd.org  Fri Jun 15 04:18:17 2018
Return-Path: <owner-freebsd-fs@freebsd.org>
Delivered-To: freebsd-fs@mailman.ysv.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1])
 by mailman.ysv.freebsd.org (Postfix) with ESMTP id 3C96F101398D
 for <freebsd-fs@mailman.ysv.freebsd.org>; Fri, 15 Jun 2018 04:18:17 +0000 (UTC)
 (envelope-from FreeBSD@shaneware.biz)
Received: from ipmail01.adl6.internode.on.net (ipmail01.adl6.internode.on.net
 [150.101.137.136])
 by mx1.freebsd.org (Postfix) with ESMTP id 72B1E7640C
 for <freebsd-fs@freebsd.org>; Fri, 15 Jun 2018 04:18:16 +0000 (UTC)
 (envelope-from FreeBSD@shaneware.biz)
Received: from ppp121-45-90-218.bras1.adl6.internode.on.net (HELO
 leader.local) ([121.45.90.218])
 by ipmail01.adl6.internode.on.net with ESMTP; 15 Jun 2018 13:43:04 +0930
Subject: Re: What append when arc full
To: Albert Shih <Albert.Shih@obspm.fr>
Cc: freebsd-fs@freebsd.org
References: <20180613200700.GA3156@io.chezmoi.fr>
 <248ad0be-2002-89b5-0c1a-3ac73d493149@ShaneWare.Biz>
 <20180614054333.GA7053@io.chezmoi.fr>
From: Shane Ambler <FreeBSD@ShaneWare.Biz>
Message-ID: <8311a9a9-1a14-3520-aea3-8078e99713b9@ShaneWare.Biz>
Date: Fri, 15 Jun 2018 13:43:02 +0930
User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:52.0) Gecko/20100101
 Thunderbird/52.8.0
MIME-Version: 1.0
In-Reply-To: <20180614054333.GA7053@io.chezmoi.fr>
Content-Type: text/plain; charset=utf-8
Content-Language: en-AU
Content-Transfer-Encoding: 8bit
X-BeenThere: freebsd-fs@freebsd.org
X-Mailman-Version: 2.1.26
Precedence: list
List-Id: Filesystems <freebsd-fs.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-fs>,
 <mailto:freebsd-fs-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-fs/>
List-Post: <mailto:freebsd-fs@freebsd.org>
List-Help: <mailto:freebsd-fs-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-fs>,
 <mailto:freebsd-fs-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 15 Jun 2018 04:18:17 -0000

On 14/06/2018 15:13, Albert Shih wrote:
> Le 14/06/2018 à 13:06:07+0930, Shane Ambler a écrit

>> If you want to keep some ram free for your processes, then you can set
>> vfs.zfs.arc_max to limit the ram used by ARC. On recent system versions
>> you can change it dynamically using sysctl or you can set it in
> 
> "dynamically" .... I though it's only can set at boot time, at least it's
> what
> 
>     https://www.freebsd.org/doc/handbook/zfs-advanced.html

It seems the handbook has dropped behind. The ability to change arc_max
and arc_min at runtime was merged into stable/10 and stable/11 almost
two years ago, that means 10.4 and 11.x can do it but 10.3 or older will
have to be set in /boot/loader.conf


-- 
FreeBSD - the place to B...Storing Data

Shane Ambler