iostat


iostat - graphics/iostarta_icon.gif Interactively report I/O and CPU statistics.

 iostat(1)                                                         iostat(1) NAME      iostat - report I/O statistics SYNOPSIS      iostat [-t] [interval [count]] DESCRIPTION      iostat iteratively reports I/O statistics for each active disk on the      system.  Disk data is arranged in a four-column format:           Column Heading           Interpretation              device                Device name              bps                   Kilobytes transferred per second              sps                   Number of seeks per second              msps                  Milliseconds per average seek      If two or more disks are present, data is presented on successive      lines for each disk.      To compute this information, seeks, data transfer completions, and the      number of words transferred are counted for each disk.  Also, the      state of each disk is examined HZ times per second (as defined in      <sys/param.h>) and a tally is made if the disk is active.  These      numbers can be combined with the transfer rates of each device to      determine average seek times for each device.      With the advent of new disk technologies, such as data striping, where      a single data transfer is spread across several disks, the number of      milliseconds per average seek becomes impossible to compute      accurately. At best it is only an approximation, varying greatly,      based on several dynamic system conditions.  For this reason and to      maintain backward compatibility, the milliseconds per average seek (      msps ) field is set to the value 1.0.    Options      iostat recognizes the following options and command-line arguments:           -t          Report terminal statistics as well as disk                       statistics.  Terminal statistics include:                            tin    Number of characters read from terminals.                            tout   Number of characters written to                                   terminals.                            us     Percentage of time system has spent in                                   user mode.                            ni     Percentage of time system has spent in                                   user mode running low-priority (nice)                                   processes.                            sy     Percentage of time system has spent in                                   system mode.                            id     Percentage of time system has spent                                   idling.           interval    Display successive lines which are summaries of the                       last interval seconds.  The first line reported is                       for the time since a reboot and each subsequent line                       is for the last interval only.           count       Repeat the statistics count times. EXAMPLES      Show current I/O statistics for all disks:           iostat      Display I/O statistics for all disks every 10 seconds until INTERRUPT      or QUIT is pressed:           iostat 10      Display I/O statistics for all disks every 10 seconds and terminate      after 5 successive readings:           iostat 10 5      Display I/O statistics for all disks every 10 seconds, also show      terminal and processor statistics, and terminate after 5 successive      readings:           iostat -t 10 5 WARNINGS      Users of iostat must not rely on the exact field widths and spacing of      its output, as these will vary depending on the system, the release of      HP-UX, and the data to be displayed. AUTHOR      iostat was developed by the University of California, Berkeley, and      HP. FILES       /usr/include/sys/param.h SEE ALSO       vmstat(1). 


HP-UX 11i Systems Administration Handbook and Toolkit
HP-UX 11i Systems Administration Handbook and Toolkit (2nd Edition)
ISBN: 0131018833
EAN: 2147483647
Year: 2003
Pages: 301

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