#!/bin/sh
# DF-4895 writer: sweep the 4MB RAID-5 volume with 32KB group writes.
# Each dd is one RAID-5 read-modify-write: first-phase reads launch via
# dev_dstrategy() on the cdev, second-phase writes launch via
# vn_strategy(drive->vp) from complete_raid5_write().
i=0
id=$1
while [ ! -f /tmp/stop_race ]; do
  off=$(( (i * 7 + id * 13) % 120 ))
  dd if=/dev/zero of=/dev/vinum/vol/rv bs=32k seek=$off count=1 conv=notrunc >/dev/null 2>&1
  i=$((i+1))
  echo $i > /tmp/wcount.$id 2>/dev/null
done