From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from lists.gentoo.org (pigeon.gentoo.org [208.92.234.80]) by finch.gentoo.org (Postfix) with ESMTP id EFCCD1381F3 for ; Tue, 17 Sep 2013 18:11:30 +0000 (UTC) Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id 7074CE0D01; Tue, 17 Sep 2013 18:11:26 +0000 (UTC) Received: from mail0200.smtp25.com (mail0200.smtp25.com [174.37.170.200]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by pigeon.gentoo.org (Postfix) with ESMTPS id 525EFE0CEF for ; Tue, 17 Sep 2013 18:11:25 +0000 (UTC) Received: from ccs.covici.com (d-out-001.smtp25.com [67.228.158.174]) by s-out-001.smtp25.com (8.14.2/8.14.2) with ESMTP id r8HIBN7o015912 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=FAIL) for ; Tue, 17 Sep 2013 14:11:23 -0400 Received: from ccs.covici.com (localhost [127.0.0.1]) by ccs.covici.com (8.14.7/8.14.5) with ESMTP id r8HIBNTS002098 for ; Tue, 17 Sep 2013 14:11:23 -0400 To: gentoo-user@lists.gentoo.org Subject: Re: [gentoo-user] ZFS In-reply-to: <523898A3.7000404@googlemail.com> References: <523898A3.7000404@googlemail.com> Comments: In-reply-to Volker Armin Hemmann message dated "Tue, 17 Sep 2013 20:00:03 +0200." X-Mailer: MH-E 8.2; nmh 1.3; GNU Emacs 23.4.1 Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-user@lists.gentoo.org Reply-to: gentoo-user@lists.gentoo.org MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Date: Tue, 17 Sep 2013 14:11:23 -0400 Message-ID: <2097.1379441483@ccs.covici.com> From: covici@ccs.covici.com X-SpamH-OriginatingIP: 70.109.53.110 X-SpamH-Filter: s-out-001.smtp25.com-r8HIBN7o015912 X-Archives-Salt: 5dfa36db-5a98-4ba1-96f1-e1d6092b13b0 X-Archives-Hash: ae753c0970bc171749bea32e09ca520d Volker Armin Hemmann wrote: > Am 17.09.2013 09:20, schrieb Grant: > > I'm convinced I need 3-disk RAID1 so I can lose 2 drives and keep > > running. I'd also like to stripe for performance, resulting in > > RAID10. It sounds like most hardware controllers do not support > > 6-disk RAID10 so ZFS looks very interesting. > > > > Can I operate ZFS RAID without a hardware RAID controller? > > > > >From a RAID perspective only, is ZFS a better choice than conventional > > software RAID? > > > > ZFS seems to have many excellent features and I'd like to ease into > > them slowly (like an old man into a nice warm bath). Does ZFS allow > > you to set up additional features later (e.g. snapshots, encryption, > > deduplication, compression) or is some forethought required when first > > making the filesystem? > > > > It looks like there are comprehensive ZFS Gentoo docs > > (http://wiki.gentoo.org/wiki/ZFS) but can anyone tell me from the real > > world about how much extra difficulty/complexity is added to > > installation and ongoing administration when choosing ZFS over ext4? > > > > Performance doesn't seem to be one of ZFS's strong points. Is it > > considered suitable for a high-performance server? > > > > http://www.phoronix.com/scan.php?page=3Dnews_item&px=3DMTM1NTA > > > > Besides performance, are there any drawbacks to ZFS compared to ext4? > > > do yourself three favours: >=20 > use ECC ram. Lots of it. 16GB DDR3 1600 ECC ram cost you less than 170=E2= =82=AC. > And it is worth it. ZFS showed me just how many silent corruptions can > happen on a 'stable' system. Errors never seen neither detected thanks > to using 'standard' ram. >=20 > turn off readahead. ZFS' own readahead and the kernel's clash - badly. > Turn off kernel's readahead for a visible performance boon. >=20 > use noop as io-scheduler. How do you turnoff read ahead? --=20 Your life is like a penny. You're going to lose it. The question is: How do you spend it? John Covici covici@ccs.covici.com