[GTALUG] Which Distro is Best for Running a ZFS-on-Linux Fileserver.

[David Mason]

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 at 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 at 2018-08-31                0      -   412K  -

tank/audio at 2018-08-31          0      -  12.1G  -

tank/cvs at 2018-08-31            0      -  32.7M  -

tank/etc at 2018-08-31            0      -  18.1M  -

tank/home at 2018-08-31           0      -   531G  -
and now I try (after some research):

: ~ ; sudo zfs send -R tank at 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 at 2018-08-31': Broken pipe

Any quick help?

Thanks  ../Dave

On Tue, 28 Aug 2018 at 17:33, Scott Sullivan via talk <talk at gtalug.org>
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 <talk at gtalug.org
> > <mailto:talk at gtalug.org>> 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
> talk at gtalug.org
> https://gtalug.org/mailman/listinfo/talk
>
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