From mboxrd@z Thu Jan 1 00:00:00 1970 From: Victor Helmholtz Subject: Re: How to backup of large md raid volumes? Date: Fri, 19 May 2017 05:36:07 +0100 Message-ID: References: <442a4af0-00d2-853d-5294-84ae0353262b@gmail.com> <75dc802b-1572-3c6f-ed62-4333deece4c2@websitemanagers.com.au> <8b840e53-1be2-b1b5-632f-e75f0c6c53b7@gmail.com> Mime-Version: 1.0 (Mac OS X Mail 9.3 \(3124\)) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Return-path: In-Reply-To: <8b840e53-1be2-b1b5-632f-e75f0c6c53b7@gmail.com> Sender: linux-raid-owner@vger.kernel.org To: Linux Raid List-Id: linux-raid.ids > On 19 May 2017, at 04:39, Ram Ramesh wrote: >=20 > 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. >>>=20 >>> If any one can think of some thing simple, please point me to it and = I will do the reading to figure out. >>>=20 >> 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. >>=20 >> Regards, >> Adam >>=20 >>=20 > 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. >=20 > 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. >=20 > Ramesh >=20 > -- > To unsubscribe from this list: send the line "unsubscribe linux-raid" = in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html I have never tried it myself, but my understanding is that in = multi-volume GNU tar archive each volume is independent. Tar manual = states: > Each volume is itself a valid GNU tar archive, so it can be read = without any special options. Consequently any file member residing = entirely on one volume can be extracted or otherwise operated upon = without needing the other volume. Sure enough, to extract a split member = you would need all volumes its parts reside on. Regards Victor=