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    SubjectRe: Partitions: Amiga RDB partition on 2 TB disk way too big, while OK in AmigaOS 4.1
    By the way, what did you use to setup the Amiga RDBs?

    {^_^} Joanne Dow

    On 2012/06/17 01:33, Martin Steigerwald wrote:
    > Sorry, forgot to keep Cc.
    >
    > I think I will keep the disk as is for a while. I just won´t plug it to
    > the Amiga, since I have my Amiga backup on another dedicated
    > disk and do not want to overwrite my Linux backups. So its available
    > for testing for a while. It should be save as long as I use the disk
    > in Linux only.
    >
    > For safety I will recreate all backups. I can checksum the BTRFS based
    > backup partition for checksum errors, but fscking the other non
    > BTRFS ones will only give a vague hint.
    >
    >
    > Am Sonntag, 17. Juni 2012 schrieb Martin Steigerwald:
    >> Hi Jens, hi Linux m68k developers,
    >>
    >> I reported that as
    >>
    >> https://bugzilla.kernel.org/show_bug.cgi?id=43511
    >>
    >> I will attach there some more debug data like binary copy of RDB and
    >> such.
    >>
    >> But maybe its easier to discuss here.
    >
    > I think this one is pretty serious:
    >
    > merkaba:~> pvdisplay /dev/sdb1
    > --- Physical volume ---
    > PV Name /dev/sdb1
    > VG Name steigerwald
    > PV Size 1,82 TiB / not usable 4,08 MiB
    > Allocatable yes
    > PE Size 4,00 MiB
    > Total PE 476931
    > Free PE 105731
    > Allocated PE 371200
    > PV UUID ZXMECC-JAir-lX8Q-rLhS-W1cS-quwz-b3FXWp
    >
    > merkaba:~> vgdisplay steigerwald
    > --- Volume group ---
    > VG Name steigerwald
    > System ID
    > Format lvm2
    > Metadata Areas 2
    > Metadata Sequence No 7
    > VG Access read/write
    > VG Status resizable
    > MAX LV 0
    > Cur LV 5
    > Open LV 1
    > Max PV 0
    > Cur PV 1
    > Act PV 1
    > VG Size 1,82 TiB
    > PE Size 4,00 MiB
    > Total PE 476931
    > Alloc PE / Size 371200 / 1,42 TiB
    > Free PE / Size 105731 / 413,01 GiB
    > VG UUID uhjjE1-0yrD-Ch1A-d9qL-P5jY-UDXE-io4bpi
    >
    >
    > with
    >
    > merkaba:~#1> amiga-fdisk -l /dev/sdc
    > Disk /dev/sdc: 3 heads, 16 sectors, 81396441 cylinders, RDB: 0
    > Logical Cylinders from 43 to 81396440, 24576 bytes/Cylinder
    >
    > Device Boot Mount Begin End Size Pri BBlks System
    > /dev/sdc1 * 43 65536043 1572864024 0 0 Linux
    > native
    > /dev/sdc2 * 65536044 78643244 314572824 0 0
    > [unknown]
    > /dev/sdc3 * 78643245 81396440 66076704 0 0 Amiga
    > FFS Int.
    >
    >
    > Due to truncating oversized partition instead of refusing to use
    > them the PV and consequently VG span the whole disk instead
    > of leaving space for the >350GB in the two other partitions:
    >
    > merkaba:~> cat /proc/partitions
    > major minor #blocks name
    >
    > […]
    > 8 16 1953514584 sdb
    > 8 17 1953513552 sdb1
    >
    > (now sdb instead of sdc back when I run amiga-fdisk)
    >
    >
    > This is just asking for trouble. Thus:
    >
    > Bug 43521 - Amiga RDB partitions: truncates miscaluted partitions size
    > instead of refusing to use it
    > https://bugzilla.kernel.org/show_bug.cgi?id=43521
    >
    >
    > My suggestion is to bail out if a partition size looks insane and
    > impossible.
    > Having to manually fix it up to access the data on disk still looks better
    > to me than potentially overwriting lots of data.
    >
    >
    >
    > Until today I never actually did an Amiga backup to the disk, I just
    > created the two Amiga partitions and copied some screenshots of them
    > but that might be enough to explain the checksum errors I found in a
    > BTRFS backup partition.
    >
    > I am now checking my Linux backups. They might be save, cause not all
    > space on the volume group is used.
    >
    > See:
    >
    > kernel got struck while scrubbing BTRFS with node- and leafsize 32768
    > http://www.mail-archive.com/linux-btrfs@vger.kernel.org/msg17108.html
    >
    > s/struck/stuck
    >
    > Thanks,
    >

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