From mboxrd@z Thu Jan 1 00:00:00 1970 From: Thomas Fjellstrom Subject: Re: Raid 5 rebuild and Raid 6 reshape question Date: Sun, 19 Apr 2015 13:42:52 -0600 Message-ID: <7771744.HcGeMFsTMj@balsa> References: <6744821.j7csV3RJVE@balsa> <1454025.2pEa89kuvv@balsa> Reply-To: thomas@fjellstrom.ca Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7Bit Return-path: In-Reply-To: Sender: linux-raid-owner@vger.kernel.org To: Mikael Abrahamsson Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids On Sun 19 Apr 2015 10:43:32 AM Mikael Abrahamsson wrote: > On Sat, 18 Apr 2015, Thomas Fjellstrom wrote: > > problem. I was just curious as to how long an actual raid5->raid6 > > reshape would normally be or this setup. I expect it normally can take a > > while as it has to rewrite a lot of data (11TiB worth). > > In my experience it takes 5-15 times longer than a normal resync takes, to > reshape from raid5->raid6. So for your 3TB disk size case, I'd say expect > 4-8 days or so. Ah. Good to know. mdstat was saying about 4-5 days. I kindof thought that was about normal given the amount of work involved to restripe all drives and calculate parity. Thanks :) -- Thomas Fjellstrom thomas@fjellstrom.ca