Date: Fri, 23 Nov 2012 09:36:22 -0800 From: freebsd@johnea.net To: freebsd-questions@freebsd.org Subject: Should newfs include -S 4096? was Re: boot problem after freebsd-update from 9.1-RC2 to 9.1-RC3 Message-ID: <50AFB42F.2000805@johnea.net> In-Reply-To: <alpine.BSF.2.00.1211202201460.42121@wonkity.com> References: <50ABE97B.5030408@johnea.net> <50AC041A.7050607@dreamchaser.org> <50AC3116.6010600@johnea.net> <alpine.BSF.2.00.1211202201460.42121@wonkity.com>
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On 2012-11-20 21:10, Warren Block wrote: > On Tue, 20 Nov 2012, freebsd@johnea.net wrote: > >> On 2012-11-20 14:28, Gary Aitken wrote: >>> On 11/20/12 13:34, freebsd@johnea.net wrote: >> >>>> freebsd-update upgrade -r 9.1-RC3 >> ... >>>> "Not UFS" "No ada0" "No boot" >> >>> >>> Seems like it isn't supposed to work for 9.1-RC2 >>> >> >> I previously used binary update to migrate from 9.0 to 9.1, via: >> >> freebsd-update upgrade -r 9.1-RC1 >> freebsd-update install >> reboot >> freebsd-update install >> reboot >> >> I'm starting to think having the swap partition in gm0s1a and the booting UFS partition in ada0s1b is the problem: >> http://forums.freebsd.org/showthread.php?t=31954 >> >> The "Not UFS" error comes immediately on boot. >> >> If I boot from rescue media, I can start the gmirror, mount it and chroot into it. >> >> The whole install seems fine except for the first stage boot loader finding the UFS partition. >> >> A handy bootloader config trick would be greatly appreciated! > > boot(8) says > > The automatic boot will attempt to load /boot/loader from partition > `a' of either the floppy or the hard disk. > > You could try setting the correct device path in /boot/boot.config, but I suspect that won't be read until too late. > > gptboot looks for the first UFS partition. Maybe /boot/boot can be modified to do that also. I ended up booting from rescue media, removing one drive and stopping the gmirror, creating a new gmirror on the removed drive to place the UFS partition first, and performing a dump/restore to transfer the system. Then I was able to boot from the new gmitrror and add the second drive to it. One of the complications was getting old metadata off of the drive. After trying a couple of 'dd' invocations: # overwriting the first sector dd if=/dev/zero of=/dev/ada0 bs=512 count=1 # also tried overwriting the last sector diskinfo ada0 | cut -f4 3907029168 (subtract 34, per WB) (I actually just subtracted the trailing 68) dd if=/dev/zero of=/dev/ada0 seek=3907029100 This would still seem to not delete all of the metadata, since after issuing: gmirror label -b split gm0 /dev/ada0 gmirror load # repartition new mirror gpart create -s MBR mirror/gm0 # ignore "mirror/gm0s1 added, but partition is not aligned on 4096 bytes" after add gpart add -t freebsd -a 4k mirror/gm0 # create the bsdlabel partitions in slice 1 (s1) gpart create -s BSD mirror/gm0s1 I would see that the old gm0s1a and gm0s1b had reappeared, even though I had not yet issued the 'add -t freebsd-ufs'. I'm not sure if they came back with the 'add -t freebsd' or the 'create -s BSD'. The only thing that seemed to fix it was: gpart destroy -F /dev/ada0 I also tried at one point: gpart destroy -F ada0 gpart create -s gpt ada0 gpart destroy -F ada0 After that I could create the new partitions within the slice, with freebsd-ufs first: # size of ufs partition must be calculated, from 'diskinfo -v /dev/ada0': 2000398934016 # media size in bytes (1.8T) ; 1024*1024*1024 1073741824 ; 2000398934016/1073741824 1863.01668548583984375 # subtract 8G from 1863 = 1855G gpart add -t freebsd-ufs -a 4k -s 1855G mirror/gm0s1 gpart add -t freebsd-swap -a 4k mirror/gm0s1 Everything looks good with 4K alignment, and freebsd-ufs first: gpart show => 63 3907029104 mirror/gm0 MBR (1.8T) 63 63 - free - (31k) 126 3907028979 1 freebsd [active] (1.8T) 3907029105 62 - free - (31k) => 0 3907028979 mirror/gm0s1 BSD (1.8T) 0 2 - free - (1.0k) 2 3890216960 1 freebsd-ufs (1.8T) 3890216962 16812016 2 freebsd-swap (8.0G) 3907028978 1 - free - (512B) After newfs, I was able to dump/restore to transfer the installed system from ada1 to gm0 (which is 9.1-RC3 now). The thing I wonder about now: Should newfs include -S 4096? I used: newfs -U /dev/mirror/gm0s1a Will this lead to 512 byte sector access to the disk through the file system? Will this impact performance or longevity of the mirror? Thanks again for the sage advice! johnea
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