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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.

CLUSTER CONSIDERATIONS

In takeover mode, the sysstat command displays the combined statistics from both the failed filer and the live filer.

The statistics diplayed by the sysstat command are cumulative; a giveback operation does not zero out the statistics. That is, after giving back its partner's resources, the live filer does not subtract the statistics about operations it performed on behalf of the failed filer in takeover mode.

SEE ALSO

na_netstat(1), na_nfsstat(1), na_partner(1).

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