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NAME

sysstat - report filer performance statistics

SYNOPSIS

sysstat [ interval ]

DESCRIPTION

sysstat reports filer performance statistics such as the current CPU utilization, the amount of network I/O, the amount of disk I/O, and the amount of tape I/O. By default, sysstat prints a new line of statistics every 15 seconds. The interval argument overrides the default causing sysstat to report once every interval seconds. Use control-C to stop sysstat.

EXAMPLE

This is an example of sysstat running on a lightly loaded NFS-only filer: 

  toaster> sysstat 1
   CPU   NFS  CIFS  HTTP    Net kB/s    Disk kB/s     Tape kB/s    Cache
                             in  out    read write    read write     age
    5%    82     0     0     15   17      16     0       0     0       8
    6%   105     0     0     24   98     100     0       0     0       8
    5%    54     0     0     32   11       0     0       0     0       8
   21%    50     0     0     25   42     120   592       0     0       8
   16%    27     0     0     10   10     144  1008       0     0       8
   17%    90     0     0     64   11      16   104       0   552       8
   15%    96     0     0     65   12       0     0       0   460       8
    5%    60     0     0     30   28      24     0       0     0       8
    1%    60     0     0     32   30      28     0       0     0       8
    4%    57     0     0     46   45      40     0       0     0       8
    5%    66     0     0     23   16       8     0       0     0       8
  ^C
  toaster>

From left to right, the columns indicate:

CPU
the percentage CPU utilization during the previous interval seconds;

NFS
the number of NFS operations per second during that time;

CIFS
the number of CIFS operations per second during that time;

HTTP
the number of HTTP operations per second during that time;

Net kB/s the number of kilobytes per second of network traffic into and out of the server;

Disk kB/s the kilobytes per second of disk traffic being read and written;

Tape kB/s the number of kilobytes per second of tape traffic being read and written;

Cache age the age in minutes of the oldest read-only blocks in the buffer cache. Data in this column indicates how fast read operations are cycling through system memory; when the filer is reading very large files (larger than the machine's memory size), buffer cache age will be very low.

SEE ALSO

na_netstat(1), na_nfsstat(1).

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