hi, you left fdisk without saving the changes (w before q), so there can't be two partitions. on the other hand, we should find the existing partition... there is a strange warning when fdisk starts: what is on the over side of nbd0 ? is /dev/nbd0 rw ? if you can't re-read the partitions table, can you disconnect /dev/nbd0 and then reconnect it ?
Le lun. 3 déc. 2018 à 16:17, ramakanth varala <ramakanth.var...@gmail.com> a écrit : > Hi , > > I tried below steps .. still with some errors.. > > > [root@localhost ~]# fdisk /dev/nbd0 > > The number of cylinders for this disk is set to 2610. > There is nothing wrong with that, but this is larger than 1024, > and could in certain setups cause problems with: > 1) software that runs at boot time (e.g., old versions of LILO) > 2) booting and partitioning software from other OSs > (e.g., DOS FDISK, OS/2 FDISK) > > Command (m for help): n > Command action > e extended > p primary partition (1-4) > p > Partition number (1-4): 1 > Partition 1 is already defined. Delete it before re-adding it. > > Command (m for help): d > Partition number (1-4): 1 > > Command (m for help): d > Selected partition 2 > > Command (m for help): p > > Disk /dev/nbd0: 21.4 GB, 21474836480 bytes > 255 heads, 63 sectors/track, 2610 cylinders > Units = cylinders of 16065 * 512 = 8225280 bytes > > Device Boot Start End Blocks Id System > > Command (m for help): n > Command action > e extended > p primary partition (1-4) > p > Partition number (1-4): 1 > First cylinder (1-2610, default 1): > Using default value 1 > Last cylinder or +size or +sizeM or +sizeK (1-2610, default 2610): 4 > > Command (m for help): n > Command action > e extended > p primary partition (1-4) > p > Partition number (1-4): 2 > First cylinder (5-2610, default 5): > Using default value 5 > Last cylinder or +size or +sizeM or +sizeK (5-2610, default 2610): > Using default value 2610 > > Command (m for help): p > > Disk /dev/nbd0: 21.4 GB, 21474836480 bytes > 255 heads, 63 sectors/track, 2610 cylinders > Units = cylinders of 16065 * 512 = 8225280 bytes > > Device Boot Start End Blocks Id System > /dev/nbd0p1 1 4 32098+ 83 Linux > /dev/nbd0p2 5 2610 20932695 83 Linux > > Command (m for help): q > > [root@localhost ~]# blockdev --rereadpt /dev/nbd0 > BLKRRPART: Invalid argument > [root@localhost ~]# ls /dev/nbd0 > /dev/nbd0 > [root@localhost ~]# ls /dev/nbd0* > /dev/nbd0 > > > > Thanks > Rama Kanth > > On Fri, Nov 30, 2018 at 6:48 PM Pascal <patate...@gmail.com> wrote: > >> do not create nodes manually but with fdisk on nbd0 : >> >> # fdisk /dev/nbd0 >> ## now create your partitions in fdisk >> ## use w to write changes and q to quit fdisk >> >> # blocdev --rereadpt /dev/nbd0 >> >> # ls /dev/nbd0* >> ## you will now have /dev/nbd0, /dev/nbd0p1 and /dev/nbd0p2 >> >> if this is not the case while the fdisk command ended without error : >> >> # sync >> # qemu-nbd -d /dev/nbd0 >> # qemu-nbd -c /dev/nbd0 /the/target >> >> >> Le ven. 30 nov. 2018 à 14:04, ramakanth varala < >> ramakanth.var...@gmail.com> >> a écrit : >> >> > Hi Pascal & Jakob, >> > >> > I started from first . >> > >> > I created manully the partitions as below >> > >> > 27 mknod /dev/nbd0p1 b 1 4 >> > 28 mknod /dev/nbd0p2 b 1 4 >> > >> > still in /proc/partitions i don't see any info , it shows as below >> > >> > [root@localhost ~]# cat /proc/partitions >> > major minor #blocks name >> > >> > 8 0 62914560 sda >> > 8 1 104391 sda1 >> > 8 2 62806117 sda2 >> > 253 0 56655872 dm-0 >> > 253 1 6127616 dm-1 >> > >> > [root@localhost ~]# fdisk -l /dev/nbd0 >> > >> > Disk /dev/nbd0: 21.4 GB, 21474836480 bytes >> > 255 heads, 63 sectors/track, 2610 cylinders >> > Units = cylinders of 16065 * 512 = 8225280 bytes >> > >> > Device Boot Start End Blocks Id System >> > /dev/nbd0p1 * 1 13 104391 83 Linux >> > /dev/nbd0p2 14 2610 20860402+ 8e Linux LVM >> > >> > >> > when i try for mount , i see below error >> > >> > >> > [root@localhost ~]# mount /dev/nbd0p1 >> > /home/test/test.3.5.1b.debug/mnt/boot >> > mount: you must specify the filesystem type >> > >> > i tried to give file system type as below, still issues. >> > >> > [root@localhost ~]# mount -t ext3 /dev/nbd0p1 >> > /home/test/test.3.5.1b.debug/mnt/boot >> > mount: wrong fs type, bad option, bad superblock on /dev/nbd0p1, >> > missing codepage or other error >> > In some cases useful info is found in syslog - try >> > dmesg | tail or so >> > >> > >> > Any inputs would be really helpfull.. >> > >> > >> > Thanks >> > Rama Kanth >> > >> > On Fri, Nov 30, 2018 at 1:50 PM Pascal <patate...@gmail.com> wrote: >> > >> >> restart from zero if possible... >> >> >> >> # qemu-nbd -d /dev/nbd0 >> >> # modprobe -rv nbd >> >> >> >> # modprobe nbd >> >> # qemu-nbd -c /dev/nbd0 /the/file >> >> # blockdev --rereadpt /dev/nbd0 >> >> # fdisk -l /dev/nbd0 >> >> # mount /dev/nbd0p1 /mount/point >> >> >> >> Le jeu. 29 nov. 2018 à 17:32, Jakob Bohm <jb-gnumli...@wisemo.com> a >> >> écrit : >> >> >> >> > Check >> >> > >> >> > cat /proc/partitions >> >> > >> >> > If the partitions are not listed there, the kernel does not >> >> > recognize them, perhaps the kernel doesn't recognize that >> >> > nbd0 is a "partitionable disk", and thus does not create the >> >> > internal nbd0p1 and ndb0p2 devices. >> >> > >> >> > If the partitions are listed there, you just need to create the >> >> > actual /dev/nbd0p1 and /dev/nbd0p2 file names with mknod or >> >> > figure out why your "/dev/" management software (maybe udev, >> >> > maybe something better) doesn't do that for you. >> >> > >> >> > On 29/11/2018 12:46, ramakanth varala wrote: >> >> > > Still with some errors.. >> >> > > >> >> > > [root@localhost ~]# kpartx -a /dev/nbd0 >> >> > > read error, sector 0 >> >> > > read error, sector 1 >> >> > > read error, sector 29 >> >> > > [root@localhost ~]# ls /dev/nbd >> >> > > nbd0 nbd1 nbd10 nbd11 nbd12 nbd13 nbd14 nbd15 nbd2 nbd3 >> >> > nbd4 >> >> > > nbd5 nbd6 nbd7 nbd8 nbd9 >> >> > > >> >> > > >> >> > > >> >> > > On Thu, Nov 29, 2018 at 4:22 PM Nerijus Baliūnas < >> >> > > neri...@users.sourceforge.net> wrote: >> >> > > >> >> > >> Please try kpartx -a /dev/nbd0 >> >> > >> >> >> > >> 2018-11-29 12:38, ramakanth varala rašė: >> >> > >>> thanks for the reply .. >> >> > >>> >> >> > >>> But i get below error when i do .. >> >> > >>> >> >> > >>> >> >> > >>> [root@localhost ~]# partx -a /dev/nbd0 >> >> > >>> HDIO_GETGEO: Inappropriate ioctl for device >> >> > >>> >> >> > >>> On Thu, Nov 29, 2018 at 4:04 PM Nerijus Baliūnas < >> >> > >>> neri...@users.sourceforge.net> wrote: >> >> > >>> >> >> > >>>> 2018-11-29 12:10, ramakanth varala rašė: >> >> > >>>>> [root@localhost ~]# mount /dev/nbd0p1 >> >> /home/test.1.3.debug/mnt/boot >> >> > >>>>> mount: special device /dev/nbd0p1 does not exist >> >> > >>>> partx -a /dev/nbd0 >> >> > >>>> >> >> > >> >> > >> >> > Enjoy >> >> > >> >> > Jakob >> >> > -- >> >> > Jakob Bohm, CIO, Partner, WiseMo A/S. https://www.wisemo.com >> >> > Transformervej 29, 2860 Søborg, Denmark. Direct +45 31 13 16 10 >> >> > This public discussion message is non-binding and may contain errors. >> >> > WiseMo - Remote Service Management for PCs, Phones and Embedded >> >> > >> >> > >> >> > >> >> >> > >> >
