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[dm-devel] dmdedup target mkfs.ext3 failed



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

 		 	   		  


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