Hi

On 11/27/2014 08:27 AM, Xiao Ni wrote:

    It says "See md(4) for  more  detail  about ’near’, ’offset’, and ’far’"
What's md(4) mean? Where can I find the detail information about this?

That's just the short form of, please see man-page about md from section 
4. On the command line

man 4 md

and it should show something like




NAME
        md - Multiple Device driver aka Linux Software RAID

SYNOPSIS
        /dev/mdn
        /dev/md/n
        /dev/md/name

DESCRIPTION
        The  md  driver  provides virtual devices that are created from 
one or more independent underlying devices.  This array of devices often 
contains redundancy and
        the devices are often disk drives, hence the acronym RAID which 
stands for a Redundant Array of Independent Disks.

[...]


Alternatively, first hit with most search engines:

http://linux.die.net/man/4/md

Cheers

Carsten
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