Show kernel RAID synchronization state
Build a paste-ready command, then review its compatibility and effects before running it.
read-onlyno known side effects Compatibility
LinuxVerified for Linux using posix, bash, zsh syntax.
Operational knowledgereview due 2027-01-20
Requirementscatcat must be installed and available on PATH.
Version supportcat Current supported releasesVerified for linux using posix, bash, zsh syntax; consult compatibility notes for platform-specific differences.
Expected signalsPersonalities : [raid1]Representative successful output; values vary with the selected target and system state.
Known errorscat: command not foundcat is missing or is not available on PATH.
Verifycat /proc/mdstatThe output matches the expected target and exits without an error.Rollback noteNot required: this command is read-only and does not change system state.
Command breakdown
01catCommandRuns the cat stage of this one-liner.
02/proc/mdstatArgumentPasses /proc/mdstat to cat.
Example input
cat /proc/mdstat
Example output
Personalities : [raid1]
md0 : active raid1 sdb1[1] sda1[0]
1047552 blocks super 1.2 [2/2] [UU]
Illustrative output — exact values vary by system and data.
Official sources