Date: Wed, 23 Dec 2015 18:42:05 +0000 From: krad <kraduk@gmail.com> To: Bob Bishop <rb@gid.co.uk> Cc: andrew clarke <mail@ozzmosis.com>, Stephen Hocking <stephen.hocking@gmail.com>, hackers@freebsd.org Subject: Re: The minimum amount of memory needed to use ZFS. Message-ID: <CALfReydYQ8yz9W6Shy7uZze0FzPUaudfz8rbfqidwYX=Saxm9A@mail.gmail.com> In-Reply-To: <26557C02-C591-4232-BBD0-988B0EB89575@gid.co.uk> References: <CA%2BxzKjDQ_vUfgz4LvvcBE950=-ww7ukCbFmZz1vnzhGrNCucbQ@mail.gmail.com> <20151223121445.GA85016@ozzmosis.com> <26557C02-C591-4232-BBD0-988B0EB89575@gid.co.uk>
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If you want something small and cheap you could look at a Celeron based Intel nuc or similar. I think I built mine for about =C2=A3150, it has an = ssd and 4gb or ram and runs zfs on root fine. It's basically a beefy router with inbuilt transparent web caching. It works well and is relatively low power for what I need. The pi and aurdino would be in a different league though in both senses of power On 23 Dec 2015 17:58, "Bob Bishop" <rb@gid.co.uk> wrote: > Hi, > > > On 23 Dec 2015, at 12:14, andrew clarke <mail@ozzmosis.com> wrote: > > > > On Wed 2015-12-23 21:43:37 UTC+1100, Stephen Hocking ( > stephen.hocking@gmail.com) wrote: > > > >> Inspired by this article: > >> > http://arstechnica.com/information-technology/2015/12/rsync-net-zfs-repli= cation-to-the-cloud-is-finally-here-and-its-fast/ > >> > >> I am wondering about changing my offsite back strategy, which currentl= y > is > >> made up of a Raspberry Pi with an external 3TB drive sitting at my > >> brother's house, with periodic manual rsyncs. I'd like to change that = to > >> doing zfs replications. > >> > >> I want to use some of my ARM based hardware as the target for the ZFS > >> replication, owing to its low power usage. I have a few Cubiboxes > floating > >> around with around 2G of RAM, and a RPI2 or a Banana Pi with 1G. It'd > have > >> a UFS root on the SD card, and ZFS on the external drive. > >> > >> Any ideas? > > > > I'm curious about this too. > > > > Currently I run a root-on-ZFS FreeBSD 10.2 amd64 system with 2 GB RAM > > that I use for offline backups. The ZFS pool consists of 2 x 1 TB > > drives in a mirror setup. I've never had FreeBSD run out of memory on > > that machine. > > > > I suggest you avoid using the deduplication feature of ZFS which from > > what I understands likes to chew through memory. > > > > I don't use ZFS snapshots on that machine, so can't speak about their > > memory usage. Perhaps it's fairly insignificant, though. > > > > An alternative might be to use something like rsnapshot, still on ZFS. > > > > You might get a bigger audience if you ask on the freebsd-questions > > list. > > > > Regards > > Andrew > > FWIW we have a backup box currently running 9.2 amd64 with 4GB RAM and a > ZFS mirror. We use rsync to transfer the data daily, and ZFS snapshots to > maintain a Time Machine-like structure (currently something over 150 > snapshots in play). We did have some instances of apparent memory > exhaustion until we limited vfs.zfs.arc_max to 2GB; that doesn=E2=80=99t = seem to > have affected performance. > > Deduplication seems like a very bad idea unless you have both a lot of > duplicated data and a serious shortage of disk. It needs a lot of RAM, > increasing over time. Depending on the hardware and the use case, > compression (which effectively only costs CPU) might be a better option. > > -- > Bob Bishop > rb@gid.co.uk > > > > > _______________________________________________ > freebsd-hackers@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org= "
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