From mboxrd@z Thu Jan 1 00:00:00 1970 From: Phil Turmel Subject: Re: RAID6 reshape integer problem Date: Fri, 03 Jan 2014 07:56:46 -0500 Message-ID: <52C6B38E.8050804@turmel.org> References: Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-raid-owner@vger.kernel.org To: Piotr Klimek , linux-raid@vger.kernel.org List-Id: linux-raid.ids On 01/03/2014 04:30 AM, Piotr Klimek wrote: > Hello, > I was trying to migrate from 5x3TB RAID5 to 6x3TB RAID6 with this command: > > $ mdadm --grow /dev/md1 --level=6 --raid-devices=6 -- > backup=/home/archiwum/r6.bak > > After couple of days reshape stalled on 2147483648 block. I have found that > this is a bug in mdadm. 2147483648 is max integer on 32 bit system. For now > situation looks like this: You'll certainly have to take production down long enough to let a newer kernel finish the reshape. Or you could be brave and replace the kernel and let production continue through the balance of the reshape. HTH, Phil