如果你用raid,可能不能用fdisk -l这个命令,而且也不是/dev/sdxy这样表示。应该这样:
# cat /proc/partitions
48 0 17899520 rd/c0d0 0 14168408 143638914 0 0 4601845 65427886 0 8160134 8896090 11399206
48 1 248976 rd/c0d0p1 0 1059573 2159964 0 0 814 2646 0 20864 8867680 5914198
48 2 2144677 rd/c0d0p2 0 1161 11144 0 0 3477 31448 0 594 8872820 1656787
48 3 6546487 rd/c0d0p3 0 242390 3679018 0 0 893929 10899952 0 676418 8891920 33736084
48 4 1 rd/c0d0p4 0 0 0 0 0 0 0 0 0 0 0
48 5 5124703 rd/c0d0p5 0 9933594 102371634 0 0 898712 11581168 0 3408823 8867670 28570348
48 6 3834549 rd/c0d0p6 0 2931651 35417050 0 0 2804913 42912672 0 4053422 8867670 3867254
48 8 35823616 rd/c0d1 0 7005132 60053668 0 0 10850485 88549432 0 719285 8896060 40301673
48 9 16892316 rd/c0d1p1 0 2682500 24111546 0 0 5174440 42623792 0 484435 8867630 14721349
48 10 18924570 rd/c0d1p2 0 4322599 35942034 0 0 5676045 45925640 0 234839 8867630 13956342
也就是/dev/rd/c0d0px和/dev/rd/c0d1px这样的表达。