From owner-freebsd-fs@freebsd.org Tue Apr 26 22:27:19 2016 Return-Path: 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 1F227B1CFEF for ; Tue, 26 Apr 2016 22:27:19 +0000 (UTC) (envelope-from andyf@andyit.com.au) Received: from alpine.spintel.net.au (alpine.spintel.net.au [IPv6:2407:e400:1::b]) (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 CEC081D41 for ; Tue, 26 Apr 2016 22:27:18 +0000 (UTC) (envelope-from andyf@andyit.com.au) Received: from hummer.af.speednet.com.au (115-69-4-237.dyn.comcen.net.au [115.69.4.237]) by alpine.spintel.net.au (Postfix) with ESMTPS id 406AE4C052D for ; Wed, 27 Apr 2016 08:27:06 +1000 (AEST) Received: from snuggles.af.speednet.com.au (snuggles.af.speednet.com.au [172.22.2.2]) by hummer.af.speednet.com.au (8.14.5/8.14.5) with ESMTP id u3QMR0L0061507 for ; Wed, 27 Apr 2016 08:27:01 +1000 (EST) (envelope-from andyf@andyit.com.au) Message-ID: <571FEB34.7040305@andyit.com.au> Date: Wed, 27 Apr 2016 08:27:00 +1000 From: Andy Farkas User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:13.0) Gecko/20120614 Thunderbird/13.0 MIME-Version: 1.0 To: freebsd-fs@freebsd.org Subject: Re: How to speed up slow zpool scrub? References: <698816653.2698619.1461685653634.JavaMail.yahoo.ref@mail.yahoo.com> <698816653.2698619.1461685653634.JavaMail.yahoo@mail.yahoo.com> <571F9897.2070008@quip.cz> In-Reply-To: <571F9897.2070008@quip.cz> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 26 Apr 2016 22:27:19 -0000 On 27/04/2016 02:34, Miroslav Lachman wrote: > DH wrote on 04/26/2016 17:47: >>> 5GB of RAM >> >> That seems to be an insufficient amount of system ram when employing >> zfs. >> >> Take a look at this: >> >> http://doc.freenas.org/9.3/freenas_intro.html#ram > > I know 5GB is not much these days but is memory used for scrubbing a > lot? Because I am satisfied with working performance. The only concern > is slow scrubbing and I am not sure that more memory helps in this case. > CPU: Intel(R) Pentium(R) 4 CPU 3.00GHz (3000.02-MHz 686-class CPU) real memory = 4294967296 (4096 MB) avail memory = 3404075008 (3246 MB) ACPI APIC Table: ad4: 3815447MB at ata2-master UDMA100 SATA ad5: 3815447MB at ata2-slave UDMA100 SATA ad6: 3815447MB at ata3-master UDMA100 SATA ad7: 3815447MB at ata3-slave UDMA100 SATA NAME SIZE ALLOC FREE CAP DEDUP HEALTH ALTROOT z 14.6T 10.1T 4.50T 69% 1.00x ONLINE - scan: scrub repaired 43K in 25h15m with 0 errors <-- NAME STATE READ WRITE CKSUM z ONLINE 0 0 0 raidz1-0 ONLINE 0 0 0 ad6 ONLINE 0 0 0 ad4 ONLINE 0 0 0 ad5 ONLINE 0 0 0 ad7 ONLINE 0 0 0 -andyf