From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bill Davidsen Subject: Re: RAID 6 grow problem Date: Mon, 04 Jun 2007 16:29:02 -0400 Message-ID: <4664760E.8040606@tmr.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-raid-owner@vger.kernel.org To: Iain Rauch Cc: Neil Brown , "linux-raid@vger.kernel.org" , Justin Piszcz List-Id: linux-raid.ids Iain Rauch wrote: >>>> raid6 reshape wasn't added until 2.6.21. Before that only raid5 was >>>> supported. >>>> You also need to ensure that CONFIG_MD_RAID5_RESHAPE=y. >>>> >>> I don't see that in the config. Should I add it? Then reboot? >>> >> You reported that you were running a 2.6.20 kernel, which doesn't >> support raid6 reshape. >> You need to compile a 2.6.21 kernel (or >> apt-get install linux-image-2.6.21-1-amd64 >> or whatever) and ensure that CONFIG_MD_RAID5_RESHAPE=y is in the >> .config before compiling. >> > > There only seems to be version 2.6.20 does this matter a lot? Also how do I > specify what is in the config when using apt-get install? > 2.6.20 doesn't support the feature you want, only you can tell if that matters a lot. You don't, either get a raw kernel source and configure, or run what the vendor provides for config. Sorry, those are the option. > >>> I used apt-get install mdadm to first install it, which gave me 2.5.x then I >>> downloaded the new source and typed make then make install. Now mdadm -V >>> shows "mdadm - v2.6.2 - 21st May 2007". >>> Is there anyway to check it is installed correctly? >>> >> The "mdadm -V" check is sufficient. >> > > Are you sure because at first I just did the make/make install and mdadm -V > did tell me v2.6.2 but I don't believe it was installed properly because it > didn't recognise my array nor did it make a config file, and cat > /proc/mdstat said no file/directory?? mdadm doesn't control the /proc/mdstat file, it's written by the kernel. The kernel had no active array to mention in the mdstat file. -- bill davidsen CTO TMR Associates, Inc Doing interesting things with small computers since 1979