#!/bin/bash

kind=$(mount | grep -i 'mdt')
if [[ 'X' == "X${kind}" ]]
 then
   procFile='/proc/fs/lustre/ost/OSS/ost_io/req_history'
 else
   procFile='/proc/fs/lustre/mds/MDS/mdt/req_history'
fi
echo "using: ${procFile}"

tmpDir='/tmp/io-use'
char='1'
((delay = 1))
progress='.'

if [[ "X" == "X$1" ]]
 then 
    ((count = 10))
 else
    count="$1"
 fi    

if [[ -d ${tmpDir} ]]
 then
    rm -rf ${tmpDir}
 fi

mkdir ${tmpDir}
cd ${tmpDir}
# touch an empty file so that if no I/O is going on, we do not get a grep error
touch dummy

while ((0 < count))
 do
    cat ${procFile} | grep -v Complete | awk -F':' '{print $3}' | sed 's/12345-//' | awk -F'@' '{print $1}' | while read num
     do 
        name=$(grep ${num} /etc/hosts | head -1 | awk '{print $2}')
        if [[ 'X' == "X${name}" ]]
         then
           name="${num}"
         fi

        echo -n ${char} >> ${name}
#        echo -n ".$name."
     done
    ((count = count - 1))
    echo -n ${progress}
    sleep ${delay}
 done
echo " "
grep -H ${char} *
cd - >/dev/null
rm -rf ${tmpDir}