From owner-freebsd-fs@freebsd.org  Wed Dec  2 21:31:32 2015
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 5F48EA3F24D
 for <freebsd-fs@mailman.ysv.freebsd.org>; Wed,  2 Dec 2015 21:31:32 +0000 (UTC)
 (envelope-from wjw@digiware.nl)
Received: from smtp.digiware.nl (unknown [IPv6:2001:4cb8:90:ffff::3])
 (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 23EFE18E6
 for <freebsd-fs@freebsd.org>; Wed,  2 Dec 2015 21:31:32 +0000 (UTC)
 (envelope-from wjw@digiware.nl)
Received: from rack1.digiware.nl (unknown [127.0.0.1])
 by smtp.digiware.nl (Postfix) with ESMTP id 257FE153431;
 Wed,  2 Dec 2015 22:31:27 +0100 (CET)
X-Virus-Scanned: amavisd-new at digiware.nl
Received: from smtp.digiware.nl ([127.0.0.1])
 by rack1.digiware.nl (rack1.digiware.nl [127.0.0.1]) (amavisd-new, port 10024)
 with ESMTP id mEQh1Dl6p8-9; Wed,  2 Dec 2015 22:31:17 +0100 (CET)
Received: from [IPv6:2001:4cb8:3:1:f108:af9:b0c4:8855] (unknown
 [IPv6:2001:4cb8:3:1:f108:af9:b0c4:8855])
 (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits))
 (No client certificate requested)
 by smtp.digiware.nl (Postfix) with ESMTPSA id 4EF2F153408;
 Wed,  2 Dec 2015 22:31:17 +0100 (CET)
Subject: Re: advice needed: zpool of 10 x (raidz2 on (4+2) x 2T HDD)
To: krad <kraduk@gmail.com>, Tom Evans <tevans.uk@googlemail.com>
References: <20151202133428.35820@smtp.new-ukraine.org>
 <CAFHbX1+9JiGeukjePqzy1vTS1-ON1vY27v2iB5daX1XGjpYNDA@mail.gmail.com>
 <CALfReycBOY3i3HRLqNVTChC=fL-=KGJT4eXBhN_=R8uGXQtSJA@mail.gmail.com>
Cc: FreeBSD Filesystems <freebsd-fs@freebsd.org>
From: Willem Jan Withagen <wjw@digiware.nl>
Message-ID: <565F6323.1090803@digiware.nl>
Date: Wed, 2 Dec 2015 22:31:15 +0100
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:38.0) Gecko/20100101
 Thunderbird/38.3.0
MIME-Version: 1.0
In-Reply-To: <CALfReycBOY3i3HRLqNVTChC=fL-=KGJT4eXBhN_=R8uGXQtSJA@mail.gmail.com>
Content-Type: text/plain; charset=windows-1252
Content-Transfer-Encoding: 7bit
X-BeenThere: freebsd-fs@freebsd.org
X-Mailman-Version: 2.1.20
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: Wed, 02 Dec 2015 21:31:32 -0000

On 2-12-2015 15:00, krad wrote:
> If this is the case, put more ram in and a good amount of SSD for l2arc.
> SSD is fairly cheap, so put in a TB of the best you can afford. RAM is
> always best though if you can afford it and fit it onto the board.
> 
> It's probably worth going to 10.2 as well, and maybe even stable as th
> have been a lot of zfs related patches since 10.1.

I used to have the odd system hangup now and then during rsync-time.
When several host start sending their backups.

They all have gone since my last upgrade.
FreeBSD zfs.digiware.nl 10.2-STABLE FreeBSD 10.2-STABLE #3 r289060M: Fri
Oct  9 11:46:21 CEST 2015

Even hangs attributed to using PCI-X bus freezes have gone.
uptime is now 54 days, where before it hardly got over 14 days.

So I think some things have changed for the better with recent patches.

--WjW