On Tue, 21 Dec 2010 18:35:55 +0100, Jan Misiak wrote: > On 21 December 2010 03:55, Ryusuke Konishi > <konishi.ryusuke@xxxxxxxxxxxxx> wrote: > > Could you get device size information in a few ways? > > Certainly. > > > 1) sysfs reported sizes > > # cat /sys/block/sdb/size > 31506432 > > > # cat /sys/block/sdb/sdb1/size > 31504384 > > > 2) Sizes on the partition table > > # fdisk -lu /dev/sdb > Disk /dev/sdb: 16.1 GB, 16131293184 bytes > 25 heads, 25 sectors/track, 50410 cylinders, total 31506432 sectors > Units = sectors of 1 * 512 = 512 bytes > Sector size (logical/physical): 512 bytes / 512 bytes > I/O size (minimum/optimal): 512 bytes / 512 bytes > Disk identifier: 0x04030201 > > Device Boot Start End Blocks Id System > /dev/sdb1 2048 31506431 15752192 7 HPFS/NTFS > > > 3) Dump of the first super block (it has the layout information) > > # dd if=/dev/sdb1 bs=1k count=1 skip=1 2>/dev/null | hd > #dd if=/dev/sdb1 bs=1k count=1 skip=1 2>/dev/null | hexdump > 0000000 0002 0000 0000 3434 0100 0000 e5da ead2 > 0000010 e644 38c1 0002 0000 0782 0000 0000 0000 > 0000020 0000 c170 0003 0000 0001 0000 0000 0000 > 0000030 0800 0000 0005 0000 92c7 0002 0000 0000 > 0000040 f800 0013 0000 0000 f1e3 0001 0000 0000 > 0000050 6000 0007 0000 0000 8836 4c69 0000 0000 > 0000060 f119 4cf0 0000 0000 f119 4cf0 0000 0000 > 0000070 002f 0032 0000 0001 8836 4c69 0000 0000 > 0000080 4e00 00ed 0000 0000 0000 0000 000b 0000 > 0000090 0080 0020 00c0 0010 2be3 b1ef 799b cb4b > 00000a0 d0a5 5ae1 9892 80a8 0000 0000 0000 0000 > 00000b0 0000 0000 0000 0000 0000 0000 0000 0000 > * > 0000400 > > Hope that helps. Please let me know if you need anything else. > > Regards, > Jan All of the information looks sane including the device sizes. By the way, did you separate the block layer problem from filesystem problem ? If not yet, could you try the following tests ? 1) quick device write test # dd if=/dev/zero of=/dev/sdb1 bs=1k count=1 skip=2 This zero-fills an unused block in the partition. 2) backup and recovery test # dd if=/dev/sdb1 of=/path-to-large-disk/backup.img bs=4k # dd if=/path-to-large-disk/backup.img of=/dev/sdb1 bs=4k With regards, Ryusuke Konishi -- To unsubscribe from this list: send the line "unsubscribe linux-nilfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
