OK, so I have an 8TB Seagate USB disk and have created a zpool on it called backup1. My main pool is called tank. I tried:
: ~ ; sudo zfs snapshot -r tank@2018-08-31 : ~ ; sudo zfs list NAME USED AVAIL REFER MOUNTPOINT backup1 508K 7.14T 136K /backup1 tank 1.66T 916G 412K /tank tank/audio 12.1G 916G 12.1G /audio tank/cvs 32.7M 916G 32.7M /tank/cvs tank/etc 18.1M 916G 18.1M /tank/etc tank/home 531G 916G 531G /home : ~ ; sudo zfs list -t snapshot NAME USED AVAIL REFER MOUNTPOINT tank@2018-08-31 0 - 412K - tank/audio@2018-08-31 0 - 12.1G - tank/cvs@2018-08-31 0 - 32.7M - tank/etc@2018-08-31 0 - 18.1M - tank/home@2018-08-31 0 - 531G - and now I try (after some research): : ~ ; sudo zfs send -R tank@2018-08-31 | sudo zfs recv -vd backup1 cannot receive new filesystem stream: destination 'backup1' exists must specify -F to overwrite it warning: cannot send 'tank@2018-08-31': Broken pipe Any quick help? Thanks ../Dave On Tue, 28 Aug 2018 at 17:33, Scott Sullivan via talk <[email protected]> wrote: > On 2018-08-27 09:24 AM, Giles Orr via talk wrote: > > On Sat, 25 Aug 2018 at 14:21, David Mason via talk <[email protected] > > <mailto:[email protected]>> wrote: > > This system is <5 years old, and at the time was kind-of leading > > edge. so I’m not worried about that. > > It’s a 4.4Tb raidz2 at 64% and has performed flawlessly. > > Unfortunately I don’t really have the time to do any serious digging > > right now, either. > > > > How do others backup their ZFS systems? Getting a 4T external drive > > doesn’t seem like the best plan, but maybe there isn’t any other > choice. > > In my case I built a secondary NAS and disk array, and do regular 'zfs > snapshots' and 'zfs sends'. In recent history I've started using > zfs-snap-manager to automate that. > > https://github.com/khenderick/zfs-snap-manager > > It's a rather coarse tool... doesn't support automate snapshots more > frequent then once a day, but will happily send over any you've made > manually (via a cron job or alternative method). > > Currently the developer has only packaged it for Arch. But I've built an > rpm spec file for it. Attached. > > > Actually, that sounds like a really good plan. In fact, buy two so you > > can do rotating backups. Think about your alternatives - about the only > > one that occurs to me is a tape drive. There used to be consumer-grade > > tape backups, but they don't exist anymore and I'd argue this is no > > longer a viable solution outside the data centre. > > > > Buying external hard drives is a really good idea: they're dirt cheap > > (at least compared to the alternative - failure of your primary). > > I agree with Giles. If you don't want to drop the coin on a second NAS, > this is a very usable strategy. Get a 6 or even 8TB disk, format it as a > ZFS pool and turn on zfs's block compression, and set copies to '2'. > > zfs set compression=lz4 <pool> > zfs set copies=2 <pool> > > Setting a number of copies, is normally not useful for a multi-disk > array, as the copies can end up on the same disk. But on a single disk, > they are an insurance policy against bad sectors. > > Then you just zfs send your snapshots to it. I regularly use this as a > local backup strategy with my work laptops. > > -- > Scott Sullivan > --- > Talk Mailing List > [email protected] > https://gtalug.org/mailman/listinfo/talk >
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