From owner-freebsd-questions@freebsd.org Sat Apr 29 05:15:22 2017 Return-Path: Delivered-To: freebsd-questions@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 406B6D54FD9 for ; Sat, 29 Apr 2017 05:15:22 +0000 (UTC) (envelope-from steve@sohara.org) Received: from smtp3.irishbroadband.ie (smtp4.irishbroadband.ie [62.231.32.6]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 015489F1 for ; Sat, 29 Apr 2017 05:15:21 +0000 (UTC) (envelope-from steve@sohara.org) Received: from [89.127.62.20] (helo=smtp.lan.sohara.org) by smtp3.irishbroadband.ie with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.76) (envelope-from ) id 1d4Kj0-0007tD-JL for freebsd-questions@freebsd.org; Sat, 29 Apr 2017 06:15:18 +0100 Received: from [192.168.63.1] (helo=steve.lan.sohara.org) by smtp.lan.sohara.org with smtp (Exim 4.89 (FreeBSD)) (envelope-from ) id 1d4Kjz-0000RS-Nv for freebsd-questions@freebsd.org; Sat, 29 Apr 2017 05:16:19 +0000 Date: Sat, 29 Apr 2017 06:15:14 +0100 From: Steve O'Hara-Smith To: freebsd-questions@freebsd.org Subject: Re: A seperate ZFS question Message-Id: <20170429061514.d08283c9d6bb6cca669b5e01@sohara.org> In-Reply-To: <480833b2-d630-a703-ecd0-3281ed49a738@ifdnrg.com> References: <20170428155105.563a2ee5192bb8a08f76ca9d@sohara.org> <480833b2-d630-a703-ecd0-3281ed49a738@ifdnrg.com> X-Mailer: Sylpheed 3.5.1 (GTK+ 2.24.29; amd64-portbld-freebsd10.3) X-Clacks-Overhead: "GNU Terry Pratchett" Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 29 Apr 2017 05:15:22 -0000 On Fri, 28 Apr 2017 22:19:33 +0100 Paul Macdonald wrote: > all this so far i knew, > > It's an entirely unwanted config, and i'll likely just migrate either > the data or the jails to another box, but i'd hoped to understand what > the config meant under ZFS: > > As i understand from comments, i have effectively created a mis-sized > RAID0 (stripe) between a SATA mirror set and a single SSD, Yes. > i'm now very glad i didn't just unplug the SSD drive and instead added a > 2nd SSD for the actual cache Good call. > So i guess i have until the SSD fails (or presumably until the SSD > reaches its capacity to fix this) Not necessarily - what version of FreeBSD are you on ? If it's 11 you may be able to remove the SSD with zpool remove (if it's 10 you can't). Failing that your options are: Live with it - but if/when the SSD fails you lose data Expand the pool by mirroring then replacing the SSD Backup, rebuild, restore -- Steve O'Hara-Smith