From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ram Ramesh Subject: Re: How to backup of large md raid volumes? Date: Thu, 18 May 2017 22:39:59 -0500 Message-ID: <8b840e53-1be2-b1b5-632f-e75f0c6c53b7@gmail.com> References: <442a4af0-00d2-853d-5294-84ae0353262b@gmail.com> <75dc802b-1572-3c6f-ed62-4333deece4c2@websitemanagers.com.au> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <75dc802b-1572-3c6f-ed62-4333deece4c2@websitemanagers.com.au> Sender: linux-raid-owner@vger.kernel.org To: Adam Goryachev , Linux Raid List-Id: linux-raid.ids On 05/18/2017 08:34 PM, Adam Goryachev wrote: > On 19/05/17 07:37, Ram Ramesh wrote: >> Any one have a method to backup large volumes like md raid6 (16TB)? >> Since the backup will not fit in one disk (in many cases and mine >> too) I am wondering, if there is a known/easy technique to backup >> using multiple usb hard drives. I googed and found a few fancy backup >> utils/systems like Amanda etc. They are overkill for me. I am >> choosing not to back up simply because of the complexity of setup as >> the data in my RAID volume is NOT precious and can be replaced with a >> week of effort. >> >> If any one can think of some thing simple, please point me to it and >> I will do the reading to figure out. >> > I suppose it depends on what you want to achieve. There are various > options such as mirroring to another raid6 array (ie, RAID60) but > really that isn't a backup, it's another replica. > I use backuppc for my backups, it works well under linux with rsync, > I'm sure there are many various options (including amanda which I've > used in the past). Ultimately, it depends on your requirements, > backups vary significantly depending on needs/etc. > > Regards, > Adam > > Here is a summary of what I like to do. I want to backup files on to (multiple) disks that will be loaded on to a USB dock. Simple one to one copy is all I am looking for. I am not interested in full vs. incremental or keeping versions of files for restore. My data is just movies and songs. All I want is a SW that understands links (to avoid duplicates) and copy files in batch on to multiple disks. I want content of each (backup) disk to be independent. This way if one backup disk dies, I have all other files unaffected by this failure. The only reason I did not try multi-volume tar is the lack of independence across disks. I suppose this is a backup question rather than RAID question. I asked here because the size of RAID volumes make it impossible to back up to a single drive and this is a more common problem RAID world rather than general user forum in a backup mailing list. Ramesh