Date: Sun, 29 Apr 2018 14:31:30 -0400 From: Jan Knepper <jan@digitaldaemon.com> To: Warner Losh <imp@bsdimp.com> Cc: Willem Jan Withagen <wjw@digiware.nl>, Alan Somers <asomers@freebsd.org>, FreeBSD Filesystems <freebsd-fs@freebsd.org>, FreeBSD Hackers <freebsd-hackers@freebsd.org>, Richard Yao <ryao@gentoo.org> Subject: Re: Getting ZFS pools back. Message-ID: <5692d3b6-038e-4c4b-c5b6-b0f719b4ac38@digitaldaemon.com> In-Reply-To: <CANCZdfonKRcFKiV%2BCmCvAQ3O5h%2BuNBcWDW7oyxOhWMdmpDHEcw@mail.gmail.com> References: <5f836c79-b379-f066-689b-1645e393c5e9@digiware.nl> <E3B39DFA-269A-4041-922E-38F0CF35CB9A@gentoo.org> <a7fb7ffc-fa5f-4031-c78a-20e7ba618566@digiware.nl> <CAOtMX2gpuc0ntoxqKJv3iw3x_Dcq99zpcmqE8g%2B2QiDtYPHmZQ@mail.gmail.com> <1645b168-4133-693c-2dd3-8e0606abb9c3@digiware.nl> <07576f68-f67e-3a22-7a50-ff261c9b3fff@digitaldaemon.com> <CANCZdfonKRcFKiV%2BCmCvAQ3O5h%2BuNBcWDW7oyxOhWMdmpDHEcw@mail.gmail.com>
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On 04/29/2018 14:21, Warner Losh wrote: > On Sun, Apr 29, 2018 at 11:57 AM, Jan Knepper <jan@digitaldaemon.com > <mailto:jan@digitaldaemon.com>> wrote: > > On 04/29/2018 13:27, Willem Jan Withagen wrote: > > Trouble started when I installed (freebsd-update) 11.1 over a > running 10.4. Which is sort of scarry? > > This does sounds 'scary' as I am planning to do this in the (near) > future... > > Has anyone else experienced issues like this? > > Generally I do build the new system software on a running system, > but then go to single user mode to perform the actual install. > > I have done many upgrades like that over 18 or so years and never > seen or heard of an issue alike this. > > > 11.x binaries aren't guaranteed to work with a 10.x kernel. So that's > a bit of a problem. freebsd-update shouldn't have let you do that either. The process I have used so far is to svnup, build, reboot... > However, most 11.x binaries work well enough to at least bootstrap / > fix problems if booted on a 10.x kernel due to targeted forward > compatibility. You shouldn't count on it for long, but it generally > won't totally brick your box. In the past, and I believe this is still > true, they work well enough to compile and install a new kernel after > pulling sources. The 10.x -> 11.x syscall changes are such that you > should be fine. At least if you are on UFS. > > However, the ZFS ioctls and such are in the bag of 'don't specifically > guarantee and also they change a lot' so that may be why you can't > mount ZFS by UUID. I've not checked to see if there's specifically an > issue here or not. The ZFS ABI is somewhat more fragile than other > parts of the system, so you may have issues here. > > If all else fails, you may be able to PXE boot an 11 kernel, or boot > off a USB memstick image to install a kernel. > > Generally, while we don't guarantee forward compatibility (running > newer binaries on older kernels), we've generally built enough forward > compat so that things work well enough to complete the upgrade. That's > why you haven't hit an issue in 18 years of upgrading. However, the > velocity of syscall additions has increased, and we've gone from > fairly stable (stale?) ABIs for UFS to a more dynamic one for ZFS > where backwards compat is a bit of a crap shoot and forward compat > isn't really there at all. That's likely why you've hit a speed bump here. > I have not closely looked at the procedures outlined in /usr/src/UPDATING for 11.x. But do I read correctly that performing a buildworld, buildkernel, then installworld and reboot to update from 10.4 to 11.x does not work? Thanks! ManiaC++ Jan Knepper
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