From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pieter De Wit Subject: Re: Looking for help how to migrate 2disk RAID1 to 3 disk RAID6 Date: Wed, 01 Jan 2014 14:02:00 +1300 Message-ID: <52C36908.2010701@insync.za.net> References: <1388537511.5058.22.camel@oxygen.netxsys.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1388537511.5058.22.camel@oxygen.netxsys.com> Sender: linux-raid-owner@vger.kernel.org To: Krzysztof Adamski , linux-raid@vger.kernel.org List-Id: linux-raid.ids On 1/01/2014 13:51, Krzysztof Adamski wrote: > I have a system with two drives like this: > / RAID1 on sda3 and sdb3 > /boot RAID1 on sda1 and sdb1 > > I would like to migrate to > / RAID6 on sdi3, sdj3 and sdh3 > /boot RAID1 on sdi1, sdj1 and sdh1 > > The /boot already done. > How would I do the migration to RAID6? > > The new drives i,j and h are larger then a and b, after the migration I > will reshape the raid to use all the space on the new raid, unless it is > possible to do it in one step. > > The reason I want RAID6 and not RAID1 with 3 drives is that later I may > add more drives to the array. > > Currently I don't trust any RAID that has only one parity drive, it has > to survive a failure of any two drives. So RAID6 or triple RAID1 are a > minimum. > > Thanks in advance, > K > > -- > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html Hi, RAID Level 6 requires a minimum of 4 drives to implement Cheers, Pieter