In this command: echo "0 8 dedup data_dev=/dev/sdb metadata_dev=/dev/sdd mdbackend=cowbtree reconstruct=no" | dmsetup create mydedup you set the size of the mydedup logical device to 8 sectors only. That's why mkfs fails - it just runs out of space. Vasily On Tue, Jun 24, 2014 at 5:59 PM, lvshuo <testfile82@xxxxxxxxxxx> wrote: > > when I user dedup target, > > echo "0 8 dedup data_dev=/dev/sdb metadata_dev=/dev/sdd mdbackend=cowbtree reconstruct=no" | dmsetup create mydedup > > [root@localhost md]# mkfs.ext3 /dev/mapper/mydedup > mke2fs 1.41.12 (17-May-2010) > /dev/mapper/mydedup: Not enough space to build proposed filesystem while setting up superblock > [root@localhost md]# > > why the create filesystem failed? dedup have any problem? > > > [root@localhost md]# fdisk -l > > Disk /dev/sdb: 2147 MB, 2147483648 bytes > 255 heads, 63 sectors/track, 261 cylinders > Units = cylinders of 16065 * 512 = 8225280 bytes > Sector size (logical/physical): 512 bytes / 512 bytes > I/O size (minimum/optimal): 512 bytes / 512 bytes > Disk identifier: 0x00000000 > > > Disk /dev/sdc: 1073 MB, 1073741824 bytes > 255 heads, 63 sectors/track, 130 cylinders > Units = cylinders of 16065 * 512 = 8225280 bytes > Sector size (logical/physical): 512 bytes / 512 bytes > I/O size (minimum/optimal): 512 bytes / 512 bytes > Disk identifier: 0x00000000 > > > Disk /dev/sdd: 8589 MB, 8589934592 bytes > 255 heads, 63 sectors/track, 1044 cylinders > Units = cylinders of 16065 * 512 = 8225280 bytes > Sector size (logical/physical): 512 bytes / 512 bytes > I/O size (minimum/optimal): 512 bytes / 512 bytes > Disk identifier: 0x00000000 > > > -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
