Re: How to backup of large md raid volumes?

[Reindl Harald <h.reindl@thelounge.net>]

Am 20.05.2017 um 20:00 schrieb Wols Lists:
> On 19/05/17 06:49, Reindl Harald wrote:
>>
>>
>> Am 18.05.2017 um 23:37 schrieb Ram Ramesh:
>>> 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
>>
>> https://www.amazon.com/16TB-Desktop-External-Drive-WDBLWE0160JCH-NESN/dp/B01B6BN1CU
>>
>>
>> 499$ is not that much for a 16 TB external backup disk and whn you
>> format it with BTRFS and enable compression you most likely have a lot
>> fo space and your backup finally is just a single rsync command
> 
> My only reaction to that is it's not a 16TB disk. It's a 16TB raid-0
> array. We had a similar setup ages ago (when 500GB was huge) with a
> 500GB external USB drive. One of the 250GB drives failed and the entire
> array was lost

well, it's a *backup* drive - when it's gone it's gone

we are using a bunch of them with 4 TB since 2011 for offsite-backups of 
the whole company cluster and they are a RAID0 too