How to troubleshoot Linux partition errors?

Give me the phone, I was decisive first let him put the system partition, the data disk partition first part, and so into the system after I remotely look at the problem. Then he does not divide the data disk after the normal installation of the system with me remotely I found the problem.

Very long string for the real RAID card recognized disk, the actual two disk is/dev/sda/dev/sdb can not mount operation. Come on, I'll try to partition him first, and I'll give you an error:

Warning:re-reading the partition table failed with error 22: invalid parameter.
The kernel still uses the old table.

After Google found:

Run ' kpartx-a ' after the ' completed is ' to ' Add all partition ' mappings on the newly-created multipath
--device E:

The command is then executed with the KPARTX-A parameter:

Kpartx-a  /dev/mapper/ddf1_4c53492020202020808627c3000000004711471100001450

Then execute the ls/dev/mapper/
I finally found out.

/dev/mapper/ddf1_4c53492020202020808627c3000000004711471100001450p7

Partition of the data disk that you just separated.

Then format:

MKFS.EXT3  /DEV/MAPPER/DDF1_4C53492020202020808627C3000000004711471100001450P7

Create LABEL:

MKDIR/DATA0
e2label/dev/mapper/ddf1_4c53492020202020808627c3000000004711471100001450p7  /data0

Modify the/etc/fstab implementation to mount automatically, add:

LABEL=/DATA0              /data0                    ext3    defaults        1 2