Show MD/RAID device information (mdadm)ΒΆ
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 mdamd_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>