gistfile1.txt

#!/bin/bash

limit=30

NFS=/scratch
LOG=/home/facade/results.csv

if ! mountpoint -q "$NFS"; then
  echo "$NFS should be a mounted NFS partition"
  exit 1
fi

calc() {
  diff=$(echo "scale=6; $finish - $start" | bc)
  simpdiff=$(echo "scale=2; $finish - $start" | bc)
  runsleft=$(echo "scale=2; $limit-$x"| bc)
  secleft=$(echo "scale=2; $runsleft*$diff"|bc)
  minleft=$(echo "scale=2; $runsleft*$diff/60"|bc)
  eta=$(date -d "($date) $secleft sec" +%r)
  echo " ==> Run $x/$limit took $simpdiff seconds. ETA: $eta or about $minleft min from now."
  echo "$diff sec to write $size MB ($x of $limit)" >> "$LOG"
}


#for size in 500 1500; do
for size in 1500; do
  x=0
  while [[ "$x" -lt "$limit" ]]; do
    x=$(( x + 1 ))
    IMG="$NFS/image.$x"
    MP="$NFS/mp"

    truncate -s 2G "$IMG"
    mkfs.ext4 -F "$IMG" &>/dev/null
    [[ -d "$MP" ]] || mkdir "$MP"

    mount -o loop "$IMG" "$MP"

    # write out 4G of random data to the mounted image
    echo " ==> Writting round $x for $size MB"

    RUNDATE=$(date "+%F %T")
    start=$(date +%s.%N)
    dd if=/dev/zero of="$MP/rnd.$x" bs=1M count=$size status=progress
    finish=$(date +%s.%N)
    calc

    umount "$MP"
    rmdir "$MP"
    rm -f "$IMG"
  done
done

For me, the larger size triggers the error in less iterations. (commented out line 25)