Date: Sat, 23 Feb 2019 15:44:28 +0100 From: Bernd Walter <ticso@cicely7.cicely.de> To: "Rodney W. Grimes" <freebsd-rwg@pdx.rh.CN85.dnsmgr.net> Cc: Ian Lepore <ian@freebsd.org>, freebsd-arm@freebsd.org Subject: Re: RBPI3B+ FreeBSD 12 ZFS Message-ID: <20190223144428.GU93368@cicely7.cicely.de> In-Reply-To: <201902221749.x1MHnO8R026440@pdx.rh.CN85.dnsmgr.net> References: <facfaeae8cef0351b91194ed0b7e30345139e668.camel@freebsd.org> <201902221749.x1MHnO8R026440@pdx.rh.CN85.dnsmgr.net>
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On Fri, Feb 22, 2019 at 09:49:24AM -0800, Rodney W. Grimes wrote: > > On Fri, 2019-02-22 at 17:38 +0200, Stefan Parvu wrote: > > > I know ZFS would need a decent amount of RAM to start with. So for > > > such low sized > > > SBC systems, like Raspberry PI having ZFS for root might be no go. > > > > > > What I meant was: how complicated would be right now for FreeBSD 12 > > > to have an > > > ARM64 RBPI3B+ image image which could use ZFS to boot from a SD Card. > > > > > > Stefan Parvu > > > sparvu@kronometrix.org > > > > > > > > > > People have run a 512MB beaglebone with zfs on sdcard. It surely wasn't > > high performance, and it reported needed some hand-tuning to run at > > all, but it worked. > > you can run zfs based systems in a very small amount of memory, > including on FreeBSD i386 IF you limit the size of the arc > cache by > vfs.zfs.arc_max= > in /boot/loader.conf > for small memory systems I recommend no more than 50% of memory. > I have run ZFS on 128MB systems, and run a VM that is zfs root > in 1G on a daily basis. So memory is NOT your issue with doing > this on a RPI3B+ > > > > > There's a lot of mythology about sdcards and what they can and can't > > do, and how supposedly fragile they are. It's all a bunch of noise you > > can safely ignore. They're slow, but they're plenty reliable. > > I agree. Also you should be able to boot the RPI3B+ from USB, > and that would be a far better solution, USB can have issues > though too, but my experience is it is a slight step better than > sdcard slowness. I did USB boot tests with a RPI3B+. It is a mess. With many devices it won't boot at all, with some it randomly fails. On the fail side there also had been a few SanDisk USB sticks. Only a few seemed to work fine, but the fact that some randomly fail to boot make me less confidend if a media really works. -- B.Walter <bernd@bwct.de> http://www.bwct.de Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.
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