Directiostat

From Siwiki

[edit] Monitoring Direct I/O

The directiostat command is a tool that dumps out the kstat information for direct I/O calls to filesystems.

# directiostat 3
  lreads lwrites  preads pwrites     Krd     Kwr holdrds  nflush
       0       0       0       0       0       0       0       0
       0       0       0       0       0       0       0       0
       0       0       0       0       0       0       0       0

Fields are:

• lreads = logical reads to the UFS via directio
• lwrites = logical writes to the UFS via directio
• preads = physical reads to media
• pwrites = physical writes to media
• Krd = kilobytes read
• Kwr = kilobytes written
• nflush = number of cached pages flushed
• holdrds = number of times the read was a "hole" in the file.

The directiostat utility can be downloaded from [here].