From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andreas Klauer Subject: Re: Import/recover RAID6 created with SAS2108? Date: Mon, 7 Mar 2016 22:50:26 +0100 Message-ID: <20160307215026.GA8042@EIS> References: <2832CD22-EADC-4BC6-A250-FE8919A92E0A@aol.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <2832CD22-EADC-4BC6-A250-FE8919A92E0A@aol.com> Sender: linux-raid-owner@vger.kernel.org To: Dan Russell Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids On Sun, Mar 06, 2016 at 04:37:42PM -0500, Dan Russell wrote: > can md read a RAID6 created by the 2108, or would I be wasting my time? It might be possible. I don't use HW-RAID anywhere but if I was forced to, this would be one of the first things to determine, how to read it with software in case the card fails. > I can paste or gist the output of madam -E (304 lines) if it would help. I don't know if it would help, but paste everything you have anyhow. Is the data encrypted? If not - search for known file type headers (like a large jpeg or tar.gz, something larger than disks * chunksize), then look at the data on the other disks at the same offsets (grab a few megs of each disks), then try to deduce the layout and structure from that. Basically use known data to reverse-engineer the layout if you currently know nothing about disk orders, chunk sizes, etc. Regards Andreas Klauer