From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ram Ramesh Subject: Re: Is it safe to shutdown while mdadm --grow is in progress. Date: Sun, 12 Oct 2014 11:00:54 -0500 Message-ID: <543AA5B6.6010200@gmail.com> References: <543A15A6.5010508@gmail.com> <20141012193555.69907c13@notabene.brown> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20141012193555.69907c13@notabene.brown> Sender: linux-raid-owner@vger.kernel.org To: NeilBrown Cc: Linux Raid List-Id: linux-raid.ids Thanks. I appreciate you taking the time to respond. I would like to forward this to those that maintain faq/wiki so that some one searches gets the info and does not have to bother you. Is that OK? I normally would go for backup before rebuild, but 15TB disk space is too much to come up with, without serious $$ and need. Besides, these are movies/recordings for htpc and the data is available on dvds/internet. So there is inherent lack of importance. In other words, I recommend backup as most do, but it looks like every one has some justification not to do, and want some one else to assure them that it is ok :-) Thanks and Regards Ramesh On 10/12/2014 03:35 AM, NeilBrown wrote: > On Sun, 12 Oct 2014 00:46:14 -0500 Ram Ramesh wrote: > >> I googled this topic and got differing answers. Some old ones report >> horror stories and others suggest rebuild continues after reboot >> normally. My array is rebuilding and it will take about 6 days to >> complete. I am expecting bad weather in a couple of days and would like >> to proactively shutdown the machine and reboot. Is this safe? >> >> If the information is already available in a clear manner, please let me >> know. >> >> uname: Linux xxx 3.13.0-37-generic #64-Ubuntu SMP Mon Sep 22 21:28:38 >> UTC 2014 x86_64 x86_64 x86_64 GNU/Linux >> mdadm - v3.2.5 - 18th May 2012 >> >> Thanks for your help >> > It is certainly designed to be safe and my experience is that it is. > However it is difficult to test all corner cases so it is not impossible that > someone what quite work right. > If something does go wrong: > 1/ don't panic > 2/ don't try to --create the array to fix it > 3/ report all details to this list and I'm 99.9% sure I can get your array > running again with all your data safe. > But I suspect it won't come to that. > > NeilBrown