> On 19 May 2017, at 04:39, Ram Ramesh <rramesh2400@xxxxxxxxx> wrote: > > 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 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > 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-- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
