cifsiostat - Linux


cifsiostat is a Linux command-line tool used to display performance statistics and status information for CIFS filesystems. It provides insights into server response times, mount and session usage, and other metrics to monitor and optimize file sharing over CIFS.


cifsiostat [-h] [-s <interval>] [-d <duration>] [-w <interval>] [-nt] [-nv] [-m] [-a] [-c]


  • -h, --help: Display help and usage information.
  • -s <interval>, --interval <interval>: Set the polling interval in seconds. Defaults to 1.
  • -d <duration>, --duration <duration>: Specify the duration of monitoring in seconds. Defaults to continuous monitoring.
  • -w <interval>, --wait <interval>: Introduce a delay in seconds before starting monitoring.
  • -nt, --no-timestamp: Suppress timestamp display in the output.
  • -nv, --no-values: Display only the column headers in the output.
  • -m, --machine-readable: Output in machine-readable format (CSV).
  • -a, --all: Monitor all CIFS filesystems.
  • -c, --connections: Display the number of open server connections per mount.


Display continuous performance statistics for all CIFS filesystems:

cifsiostat -a

Monitor for 5 minutes and display only the column headers:

cifsiostat -d 300 -nv

Show machine-readable output with a delay of 10 seconds:

cifsiostat -m -w 10

Common Issues

  • Missing CIFS kernel module: Ensure the cifs kernel module is loaded.
  • Permission denied: Verify that the user has read access to the CIFS filesystems.
  • No output: If no output is displayed, check the interval and duration settings.


cifsiostat can be combined with other tools for advanced troubleshooting and analysis:

  • perf: Monitor the performance of individual CIFS processes.
  • iostat: Analyze disk I/O performance for CIFS filesystems.
  • strace: Trace CIFS system calls for detailed debugging.

Related Commands

  • mount.cifs
  • umount.cifs
  • smbclient