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  • What type of disk controller are they attached to? (Don't say "SCSI." I mean brand and model.) Does the disk controller show these disks during the text phase of the boot process? Commented Nov 7, 2014 at 14:31
  • Yes,the boot process has detect both two hard disk.I don't know what type of disk controller are they attached to,where can I find this information? Commented Nov 7, 2014 at 14:34
  • Follow the disk control cable inside the computer from the disk drive to the board it attaches to. Read the brand and model off the board. If you trace it to the motherboard, this information will be in the motherboard's manual, but you could just give the motherboard brand and model instead. Commented Nov 7, 2014 at 14:43
  • The machine I used is a server,not a normal computer,so it may not be easy to open the machine and check the motherboard.Can I use some command to show this information? Commented Nov 7, 2014 at 14:48
  • You need special server screwdrivers, then? :) Well, as you wish. Try dmesg | less. Commented Nov 7, 2014 at 14:49