Expose iostat values via SNMP.

In your net-snmp'd config file::

  pass_persist .1.3.6.1.3.1 /path/to/snmp-iostat-bridge

Optional arguments::

  --base_oid <oid>  - Change the base oid to query against.
  --interval <secs> - Interval in seconds to refresh iostat values.

You can now query your OID subtree::

  snmpwalk -c public -v1 localhost .1.3.6.1.3.1

Values outputted will be coresponding to the iostat output, but with the index prepended:

Linux::

  Device: rrqm/s wrqm/s r/s  w/s   rkB/s  wkB/s  avgrq-sz avgqu-sz  await r_await w_await  svctm  %util
  sda     1.00   18.34  3.67 42.98 247.61 306.37 23.75    0.04      0.80  4.16    0.51     0.52   2.42

Solaris::

  device    r/s    w/s   kr/s   kw/s wait actv  svc_t  %w  %b
  sd0       0.0    0.2    0.0    1.5  0.0  0.0    4.3   0   0

snmpwalk output::

  .iso.3.6.1.3.1.1.1 = STRING: "1"
  .iso.3.6.1.3.1.2.1 = STRING: "sda"
  .iso.3.6.1.3.1.3.1 = STRING: "1.00"
  .iso.3.6.1.3.1.4.1 = STRING: "18.34"
  .iso.3.6.1.3.1.5.1 = STRING: "3.67"
  .iso.3.6.1.3.1.6.1 = STRING: "42.98"
  .iso.3.6.1.3.1.7.1 = STRING: "247.61"
  .iso.3.6.1.3.1.8.1 = STRING: "306.37"
  .iso.3.6.1.3.1.9.1 = STRING: "23.75"
  .iso.3.6.1.3.1.10.1 = STRING: "0.04"
  .iso.3.6.1.3.1.11.1 = STRING: "0.80"
  .iso.3.6.1.3.1.12.1 = STRING: "4.16"
  .iso.3.6.1.3.1.13.1 = STRING: "0.51"
  .iso.3.6.1.3.1.14.1 = STRING: "0.52"
  .iso.3.6.1.3.1.15.1 = STRING: "2.42"