From owner-freebsd-fs@freebsd.org  Tue Apr 26 16:30:41 2016
Return-Path: <owner-freebsd-fs@freebsd.org>
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 B9BD6B1DFD3
 for <freebsd-fs@mailman.ysv.freebsd.org>; Tue, 26 Apr 2016 16:30:41 +0000 (UTC)
 (envelope-from 000.fbsd@quip.cz)
Received: from elsa.codelab.cz (elsa.codelab.cz [94.124.105.4])
 (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 7E74D1ABE
 for <freebsd-fs@freebsd.org>; Tue, 26 Apr 2016 16:30:41 +0000 (UTC)
 (envelope-from 000.fbsd@quip.cz)
Received: from elsa.codelab.cz (localhost [127.0.0.1])
 by elsa.codelab.cz (Postfix) with ESMTP id 4789128426;
 Tue, 26 Apr 2016 18:30:38 +0200 (CEST)
Received: from illbsd.quip.test (ip-86-49-16-209.net.upcbroadband.cz
 [86.49.16.209])
 (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits))
 (No client certificate requested)
 by elsa.codelab.cz (Postfix) with ESMTPSA id 7A29E28423;
 Tue, 26 Apr 2016 18:30:37 +0200 (CEST)
Message-ID: <571F97AD.9080107@quip.cz>
Date: Tue, 26 Apr 2016 18:30:37 +0200
From: Miroslav Lachman <000.fbsd@quip.cz>
User-Agent: Mozilla/5.0 (X11; FreeBSD amd64;
 rv:35.0) Gecko/20100101 Firefox/35.0 SeaMonkey/2.32
MIME-Version: 1.0
To: Jeremy Faulkner <gldisater@gmail.com>, freebsd-fs@freebsd.org
Subject: Re: How to speed up slow zpool scrub?
References: <571F62AD.6080005@quip.cz> <571F687D.8040103@internetx.com>
 <571F6EA4.90800@quip.cz> <571F82B5.3010807@gmail.com>
 <571F845C.5060902@quip.cz> <571F9064.2010602@gmail.com>
In-Reply-To: <571F9064.2010602@gmail.com>
Content-Type: text/plain; charset=windows-1252; format=flowed
Content-Transfer-Encoding: 7bit
X-BeenThere: freebsd-fs@freebsd.org
X-Mailman-Version: 2.1.21
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: Tue, 26 Apr 2016 16:30:41 -0000

Jeremy Faulkner wrote on 04/26/2016 17:59:
>
>
> On 2016-04-26 11:08 AM, Miroslav Lachman wrote:
>> Jeremy Faulkner wrote on 04/26/2016 17:01:
>>> zfs get all tank0
>>
>> I set checksum=fletcher4 and compression=lz4 (+ atime & exec to Off),
>> anything else is in default state.
>>
>> There are 19 filesystems on tank0 and each have about 5 snapshots.
>>
>> I don't know how long scrub runs on some others system. If it is limited
>> by CPU, or disk IOps... but for me 3 - 4 days are really long.

[...]

> Check the drive health with smartctl (part of sysutils/smartmontools).
> Are the drives desktop drives or nas drives? In gstat is one drive
> busier than the rest? If so, replace that drive.

Drives are OK, smartd is running on the background, I have monitoring of 
some SMART values and all drives are loaded equally.

Model Family:     Seagate NAS HDD
Device Model:     ST4000VN000-1H4168

Miroslav Lachman