From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ram Ramesh Subject: Re: My MD is too big to resize ext4. Date: Sat, 8 Jul 2017 13:37:58 -0500 Message-ID: <05c7f3c8-8eb1-a7c2-a3d3-125b00215aba@gmail.com> References: <6c827d07-19d8-017b-ca95-5e6f84b7821a@gmail.com> <20170708161513.37b09dbc@natsu> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20170708161513.37b09dbc@natsu> Sender: linux-raid-owner@vger.kernel.org To: Roman Mamedov Cc: Linux Raid List-Id: linux-raid.ids On 07/08/2017 06:15 AM, Roman Mamedov wrote: > On Fri, 7 Jul 2017 19:41:13 -0500 > Ram Ramesh wrote: > >> On the web, I only found one solution that required upgrading kernel to >> some very recent one (not in my distro) and getting the bleeding edge >> resize2fs. This makes me nervous. Is there a solution that avoids this. > Considering the other possible options that have been mentioned, using the > Ext4 built-in larger devices support (which has been implemented recently) > seems to be your best bet. > https://askubuntu.com/questions/779754/how-do-i-resize-an-ext4-partition-beyond-the-16tb-limit > > The required e2fsprogs version 1.43 is included in Ubuntu 16.10 by now, so you > don't even need to build it from the source. > https://packages.ubuntu.com/yakkety/e2fsprogs > > But really, if you have everything on one array with a single huge filesystem > and no backups, that's just asking for trouble and a complete data loss. > Thanks. This is exactly the one that I was talking about as a web solution. Did not know it is available in 16.10. Besides the above, I hear your last caution well. I do have backup by distributing files using rsync over multiple (old) disks (4+4+3+3TB). I just don't trust my back up and thus pretend that I do not have one. However, for a short one week trial, I think, I am ok. Going forward, I will not be able to backup 24TB volume (if I succeed in building one big MD) as I will not have enough drives to distribute data. So, there is going to be a problem. So, I am thinking seriously building several smaller MD devices out of my 6x6TB drives. Look at my reply to Andreas. Let me know your thoughts on that. If I build smaller MDs each can be temporarily backed up for updates etc. So, I will still be ok with data as long as I work only on one MD at a time that fits my set of backup disks. Ramesh