From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefan *St0fF* Huebner Subject: Re: using dd (or dd_rescue) to salvage array Date: Tue, 07 Feb 2012 21:01:01 +0100 Message-ID: <4F3182FD.9030602@gmx.net> References: <4F309313.2070406@turmel.org> <4F309CB3.2080400@turmel.org> <8eekv8xpcn.ln2@goaway.wombat.san-francisco.ca.us> <0cdtv8xv8f.ln2@goaway.wombat.san-francisco.ca.us> <4F2D7280.8020500@stud.tu-ilmenau.de> <8q0309x4kf.ln2@goaway.wombat.san-francisco.ca.us> <4F304822.8000102@gmx.net> <20120207042407.GA5927@wombat.san-francisco.ca.us> Reply-To: st0ff@npl.de Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20120207042407.GA5927@wombat.san-francisco.ca.us> Sender: linux-raid-owner@vger.kernel.org To: Keith Keller Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids On 07.02.2012 05:24, Keith Keller wrote: > On Mon, Feb 06, 2012 at 10:37:38PM +0100, Stefan *St0fF* Huebner wrote: >> From the logical point of view those lost 8k would create bad data - >> i.e. a filesystem problem OR simply corrupted data. That depends on >> which blocks exactly are bad. If you were using lvm it could even be >> worse, like broken metadata. > FWIW, xfs_repair has spit out over 100k lines on stderr, but when I > mounted before the repair (this is suggested if you need to replay the > log), everything seemed intact. So I'm not yet sure what to make of > things; perhaps it'll be fine, or perhaps I need to start over. > (Alternatively, perhaps the next rsnapshot run will expose problems.) > > > On Mon, Feb 06, 2012 at 10:38:27PM -0500, Phil Turmel wrote: >> But, I reviewed the OEM documentation for the 7K3000 family, and they >> clearly document support for the SCT ERC commands (para 9.18.1.2). > If I'm reading the docs right, then the 5K3000 also supports them (if > you're really cheap and can tolerate the slower speeds). At this point, > if we're waiting till April for real ''enterprise'' drives, I can't see > anything too bad about getting one or two of these and testing them out > in my environment--the EARS drives are bad enough with my configuration > that it's hard to imagine being any worse. (To be fair, I have to blame > the 3ware 9550 controller a bit too; I have EARS drives on other 3ware > controllers without all these issues.) > > --keith > > > Sounds promising. If you're really lucky, the blocks were freed by the fs and nothing has gone... Stefan