问题已解决：原来是DELL自带集成的S100 RAID卡只支持windows，不支持linux，其实之前RAID确实做成功了，但在linux系统下就是不认，怎么认出来的都是4块1T的硬盘。
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下属公司的服务器新买了4块1T的硬盘，我是要求做RAID10，然后再装redhat linux 5.4，然后他们就找人把这些都做好了，我远程连过去一看感觉好像没做RAID，看到的还是4块1T的硬盘，如下所示
[root@bogon ~]# fdisk -l
Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 1 127 1020096 83 Linux
/dev/sda2 128 121601 975739905 fd Linux raid autodetect
Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdb1 * 1 60800 488375968+ 83 Linux
/dev/sdb2 60801 121601 488384032+ fd Linux raid autodetect
Disk /dev/sdc: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdc1 * 1 1274 10233373+ 82 Linux swap / Solaris
/dev/sdc2 1275 121601 966526627+ fd Linux raid autodetect
Disk /dev/sdd: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdd1 * 1 121601 976760001 fd Linux raid autodetect
Disk /dev/md0: 1000.2 GB, 1000209907712 bytes
2 heads, 4 sectors/track, 244191872 cylinders
Units = cylinders of 8 * 512 = 4096 bytes
Disk /dev/md0 doesn't contain a valid partition table
联系他们说他们没做RAID10，但那边告诉我说找来装系统的人给他们做的是linux下的软RAID，看上面几块盘也都显示 Linux raid autodetect，请问这个软RAID是什么概念啊？就上面的输出来说能知道做的是RAID几么？软RAID能替代硬件的RAID10么？
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