cmd/zpool/zpool.d/iostat

   1 #!/bin/sh
   2 #
   3 # Display most relevant iostat bandwidth/latency numbers.  The output is
   4 # dependent on the name of the script/symlink used to call it.
   5 #
   6
   7 helpstr="
   8 iostat:         Show iostat values since boot (summary page).
   9 iostat-1s:      Do a single 1-second iostat sample and show values.
  10 iostat-10s:     Do a single 10-second iostat sample and show values."
  11
  12 script="${0##*/}"
  13 if [ "$1" = "-h" ] ; then
  14         echo "$helpstr" | grep "$script:" | tr -s '\t' | cut -f 2-
  15         exit
  16 fi
  17
  18 # Sometimes, UPATH ends up /dev/(null).
  19 # That should be corrected, but for now...
  20 # shellcheck disable=SC2154
  21 if [ ! -b "$VDEV_UPATH" ]; then
  22         somepath="${VDEV_PATH}"
  23 else
  24         somepath="${VDEV_UPATH}"
  25 fi
  26
  27 if [ "$script" = "iostat-1s" ] ; then
  28         # Do a single one-second sample
  29         interval=1
  30         # Don't show summary stats
  31         brief="yes"
  32 elif [ "$script" = "iostat-10s" ] ; then
  33         # Do a single ten-second sample
  34         interval=10
  35         # Don't show summary stats
  36         brief="yes"
  37 fi
  38
  39 if [ -f "$somepath" ] ; then
  40         # We're a file-based vdev, iostat doesn't work on us.  Do nothing.
  41         exit
  42 fi
  43
  44 if [ "$(uname)" = "FreeBSD" ]; then
  45         out=$(iostat -dKx \
  46                 ${interval:+"-w $interval"} \
  47                 ${interval:+"-c 1"} \
  48                 "$somepath" | tail -n 2)
  49 else
  50         out=$(iostat -kx \
  51                 ${brief:+"-y"} \
  52                 ${interval:+"$interval"} \
  53                 ${interval:+"1"} \
  54                 "$somepath" | grep -v '^$' | tail -n 2)
  55 fi
  56
  57
  58 # Sample output (we want the last two lines):
  59 #
  60 # Linux 2.6.32-642.13.1.el6.x86_64 (centos68)   03/09/2017      _x86_64_        (6 CPU)
  61 #
  62 # avg-cpu:  %user   %nice %system %iowait  %steal   %idle
  63 #           0.00    0.00    0.00    0.00    0.00  100.00
  64 #
  65 # Device:         rrqm/s   wrqm/s     r/s     w/s    rkB/s    wkB/s avgrq-sz avgqu-sz   await r_await w_await  svctm  %util
  66 # sdb               0.00     0.00    0.00    0.00     0.00     0.00     0.00     0.00    0.00    0.00    0.00   0.00   0.00
  67 #
  68
  69 # Get the column names
  70 cols=$(echo "$out" | head -n 1)
  71
  72 # Get the values and tab separate them to make them cut-able.
  73 vals=$(echo "$out" | tail -n 1 | tr -s '[:space:]' '\t')
  74
  75 i=0
  76 for col in $cols ; do
  77         i=$((i+1))
  78         # Skip the first column since it's just the device name
  79         if [ "$i" -eq 1 ]; then
  80                 continue
  81         fi
  82
  83         # Get i'th value
  84         val=$(echo "$vals" | cut -f "$i")
  85         echo "$col=$val"
  86 done