Show MD/RAID device information (mdadm)
=======================================

The mdadm command allows users to fetch information about various RAID devices, including types, sizes, constituent devices and their sizes, spare devices, etc.

Options provided by 'mdadm'::

    crash> mdadm -h
    usage: mdadm [-h] [-m] [-d]

    optional arguments:
      -h, --help     show this help message and exit
      -m, --mddev    show mdadm_crash_format
      -d, --details  show mdadm_-D_format

Without any options, "mdadm" behaves similar to "mdadm -m"::

    crash> mdadm

    Device : /dev/md125
    Raid Level :       Version : 0.90   metadata_type : imsm
    Size : NA
    mddev    ff34acae62e30000         md_personality  Not Available
    gendisk  ff34aca1a5d8f000   

    flags :  0   sb_flags : 0  external : 1 

    disk0 : dev-nvme2n1    size: 0.00GB    md_rdev ff34acaf21e29000

    =================================================================================== 

    Device : /dev/md126
    Raid Level : raid1      Version : 0.90   metadata_type : /md127/0
    Array Size : 1831416.00MB  (1788.49GB)    Total Devices : 2
    mddev    ff34aca50080a000         md_personality  ffffffffc09dc260
    gendisk  ff34aca9205d5000   

    flags :  32   sb_flags : 0  external : 1 

    disk1 : dev-nvme0n1    size: 1788.49GB    md_rdev ff34aca380b99c00
    disk0 : dev-nvme1n1    size: 1788.49GB    md_rdev ff34aca380b99000

    =================================================================================== 

    Device : /dev/md127
    Raid Level :       Version : 0.90   metadata_type : imsm
    Size : NA
    mddev    ff34aca500976000         md_personality  Not Available
    gendisk  ff34aca9205d0000   

    flags :  0   sb_flags : 0  external : 1 

    disk1 : dev-nvme0n1    size: 0.00GB    md_rdev ff34acab0020a400
    disk0 : dev-nvme1n1    size: 0.00GB    md_rdev ff34aca7a0143400

    =================================================================================== 

     ** Execution took   0.00s (real)   0.00s (CPU)


    crash> mdadm -m

    Device : /dev/md125
    Raid Level :       Version : 0.90   metadata_type : imsm
    Size : NA
    mddev    ff34acae62e30000         md_personality  Not Available
    gendisk  ff34aca1a5d8f000   

    flags :  0   sb_flags : 0  external : 1 

    disk0 : dev-nvme2n1    size: 0.00GB    md_rdev ff34acaf21e29000

    =================================================================================== 

    Device : /dev/md126
    Raid Level : raid1      Version : 0.90   metadata_type : /md127/0
    Array Size : 1831416.00MB  (1788.49GB)    Total Devices : 2
    mddev    ff34aca50080a000         md_personality  ffffffffc09dc260
    gendisk  ff34aca9205d5000   

    flags :  32   sb_flags : 0  external : 1 

    disk1 : dev-nvme0n1    size: 1788.49GB    md_rdev ff34aca380b99c00
    disk0 : dev-nvme1n1    size: 1788.49GB    md_rdev ff34aca380b99000

    =================================================================================== 

    Device : /dev/md127
    Raid Level :       Version : 0.90   metadata_type : imsm
    Size : NA
    mddev    ff34aca500976000         md_personality  Not Available
    gendisk  ff34aca9205d0000   

    flags :  0   sb_flags : 0  external : 1 

    disk1 : dev-nvme0n1    size: 0.00GB    md_rdev ff34acab0020a400
    disk0 : dev-nvme1n1    size: 0.00GB    md_rdev ff34aca7a0143400

    =================================================================================== 

     ** Execution took   0.00s (real)   0.01s (CPU)
    crash> 


"mdadm -d" output resembles the 'mdadm -D' Linux command::

    crash> mdadm -d
    Device : /dev/md125
    Version : 0.90       metadata_type : imsm
    Creation Time : Wed Dec 31 19:00:00 1969
    Raid Level : 
    Array Size : NA
    RAID Devices : ['dev-nvme2n1']
    Total Devices : 1
    Persistence : NA
    Update Time : Wed Dec 31 19:00:00 1969
    Chunk Size : NA

    Device              Number       RaidDevice 
    dev-nvme2n1             0  Spare/Faulty   

    ----------------------------------------------------------------------------

    Device : /dev/md126
    Version : 0.90       metadata_type : /md127/0
    Creation Time : Wed Dec 31 19:00:00 1969
    Raid Level : raid1
    Array Size : 1831416.00MB  (1788.49GB)
    RAID Devices : ['dev-nvme0n1', 'dev-nvme1n1']
    Total Devices : 2
    Persistence : NA
    Update Time : Wed Dec 31 19:00:00 1969
    Chunk Size : 64.0K

    Device              Number       RaidDevice 
    dev-nvme0n1             1               0 
    dev-nvme1n1             0               1 

    ----------------------------------------------------------------------------

    Device : /dev/md127
    Version : 0.90       metadata_type : imsm
    Creation Time : Wed Dec 31 19:00:00 1969
    Raid Level : 
    Array Size : NA
    RAID Devices : ['dev-nvme0n1', 'dev-nvme1n1']
    Total Devices : 2
    Persistence : NA
    Update Time : Wed Dec 31 19:00:00 1969
    Chunk Size : NA

    Device              Number       RaidDevice 
    dev-nvme0n1             1  Spare/Faulty   
    dev-nvme1n1             0  Spare/Faulty   

    ----------------------------------------------------------------------------

     ** Execution took   0.00s (real)   0.00s (CPU)
    crash>