#!/bin/sh
#
# created by Chifeng Qu<chifeng@gmail.com>
#

ZPOOL=/usr/sbin/zpool
POOLNAME=`basename $0 | sed 's/^zfs_//g'`
TAIL=/usr/gnu/bin/tail

if [ "$1" = "config" ]; then

        echo "graph_title ZFS pool $POOLNAME read/write (in MB)"
	echo 'graph_category disk'
	echo "read.label ReadSpeed"
	echo "write.label WriteSpeed"
        exit 0
fi

$ZPOOL iostat $POOLNAME 1 2 | $TAIL -1 | nawk '
function scale(value) {
  if (value ~ /G$/) { sub("G", "", value); value *= 1024 }
  else if (value ~ /M$/) sub("M", "", value)
  else if (value ~ /K$/) { sub("K", "", value); value /= 1024 }
  else value /= 1024 * 1024;
  return value;
}
{
  bread = scale($6);
  bwrite = scale($7);

  print "read.value", bread
  print "write.value", bwrite
}'