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[root@mycentos var]# mdadm --manage /dev/md0 --add /dev/sdb8 --remove /dev/sdb1
mdadm: cannot find /dev/sdb8: No such file or directory
[root@mycentos var]# fdisk -l /dev/sdb
Disk /dev/sdb: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 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: 0x7b75064c
Device Boot Start End Blocks Id System
/dev/sdb1 1 128 1028128+ 83 Linux
/dev/sdb2 129 256 1028160 83 Linux
/dev/sdb3 257 1305 8426092+ 5 Extended
/dev/sdb5 257 388 1060258+ 83 Linux
/dev/sdb6 389 520 1060258+ 83 Linux
/dev/sdb7 521 652 1060258+ 83 Linux
/dev/sdb8 653 784 1060258+ 83 Linux
[root@mycentos var]# |
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