Date: Fri, 22 Feb 2019 09:53:52 -0600 From: Karl Denninger <karl@denninger.net> To: freebsd-arm@freebsd.org Subject: Re: RBPI3B+ FreeBSD 12 ZFS Message-ID: <19ed5715-f1f1-6c5d-5dc6-e9c5225e5445@denninger.net> In-Reply-To: <5D976A97-9800-4A9F-A155-F3BD998AFB4C@kronometrix.org> References: <E387BB48-540D-4F5C-BD4D-2BF410108219@kronometrix.org> <a0239ad1-5b98-1149-1d14-966ed8670e79@denninger.net> <5D976A97-9800-4A9F-A155-F3BD998AFB4C@kronometrix.org>
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This is a cryptographically signed message in MIME format. --------------ms060101060603070705000103 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On 2/22/2019 09:38, Stefan Parvu wrote: > I know ZFS would need a decent amount of RAM to start with. So for such= low sized=20 > 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=20 > ARM64 RBPI3B+ image image which could use ZFS to boot from a SD Card. > > Stefan Parvu > sparvu@kronometrix.org I'm trying to figure out the use case. Will it boot?=C2=A0 Probably.=C2=A0 Is it asking for trouble?=C2=A0 Almos= t-definitely. SD cards are not write-durable to begin with.=C2=A0 I use NanoBSD-style configurations on these units because I've had *several* SD card failures over the last few years in them, which were only halted when I stopped treating them the same way I'd look at either a traditional SSD or spinning rust, just slower.=C2=A0 I suspect ZFS is only going to ampli= fy that problem -- maybe by a lot. It's easy enough to figure out whether the base case will run; boot the traditional media and then issue a "zfs" command so the .ko files come in and then see what sort of free RAM you have.=C2=A0 If it crashes insta= ntly you have your answer, but I would expect it, at that level, to "work" -- you can then set up a pool on a USB-attached disk and see how that goes.=C2=A0 The issue is that without swap (and swapping to an SD card is= an insanely bad idea) RAM pressure results in killed jobs so the next-obvious question is what do you want to run on the Pi once it's booted and running?=C2=A0 You're taking on a pretty decent amount of over= head so the question becomes "for what purpose?" If I get some time I'll play with it here (I use the Pis for embedded work on FreeBSD fairly heavily but right now am in the middle of some build work that precludes me from doing it today) but I'm having trouble envisioning why you'd want a zfs root on a Pi to begin with. --=20 Karl Denninger karl@denninger.net <mailto:karl@denninger.net> /The Market Ticker/ /[S/MIME encrypted email preferred]/ --------------ms060101060603070705000103 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgMFADCABgkqhkiG9w0BBwEAAKCC DdgwggagMIIEiKADAgECAhMA5EiKghDOXrvfxYxjITXYDdhIMA0GCSqGSIb3DQEBCwUAMIGL MQswCQYDVQQGEwJVUzEQMA4GA1UECAwHRmxvcmlkYTESMBAGA1UEBwwJTmljZXZpbGxlMRkw FwYDVQQKDBBDdWRhIFN5c3RlbXMgTExDMRgwFgYDVQQLDA9DdWRhIFN5c3RlbXMgQ0ExITAf 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