From mboxrd@z Thu Jan 1 00:00:00 1970 From: Roaming Subject: Re: please help - raid 1 degraded Date: Thu, 12 Feb 2015 10:11:50 +0000 Message-ID: <54DC7C66.50709@youngman.org.uk> References: <20150211180403.GA14805@fnord.prismnet.com> <54DBD3E2.80701@websitemanagers.com.au> <20150212000940.GA49579@eris.prismnet.com> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20150212000940.GA49579@eris.prismnet.com> Sender: linux-raid-owner@vger.kernel.org To: sunruh@prismnet.com Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids On 12/02/2015 00:09, sunruh@prismnet.com wrote: > i dont seem to be seeing the partition sizes or im stupid. > couldnt i just dd if=/dev/sdb of=/dev/sdc bs=1G count=240 and then do the > mdadm? NOT a good idea. I don't know what it would do in your case, where you are using the entire disk, but if you're using a partition table you would suddenly end up with a bunch of duplicate GUIDs. Bearing in mind the "GU" stands for "globally unique", your management tools are likely to get confused ... not a good idea especially wrt raid. Cheers, Wol