====== Disks wipe and tests ======

===== look at SMART values =====
<code bash>
smartctl -a /dev/sda
</code>
===== check the global SMART status =====
<code bash>
smartctl -H /dev/sda
</code>
===== wipe the disk =====
<code bash>
dd if=/dev/zero of=/dev/sda bs=128M
</code>
===== check the bandwidth (continuous writes) with iotop (apt get update / apt-get install iotop / iotop) =====

===== test the disk with diskscan =====
<code bash>
diskscan -s random /dev/sda
</code>
===== check the bandwidth (random reads) with iotop =====

===== test the disk with internal SMART routine =====
<code bash>
smartctl -t long /dev/sda
</code>
===== watch test progress with ===== 
<code bash>
smartctl -a /dev/sda
</code>
===== fio =====

**Script :**

  DATEHOUR=$(date "+%Y%m%d-%H%M%S"
  DISKNAME="iscsi"
  fio \
    --size=10G \
    --sync=0 \
    --fsync=100 \
    --direct=1 \
    --verify=0 \
    --zero_buffers \
    --invalidate=1 \
    --ioengine=libaio \
    --rw=randrw \
    --rwmixread=50 \
    --bssplit=8k/50:16k/50 \
    --numjobs=50 \
    --iodepth=64 \
    --runtime=120 \
    --time_based \
    --group_reporting \
    --gtod_reduce=1 \
    --filename=fio_pool \
    --name "fio_test_${DISKNAME}-${DATEHOUR}"

**Shell :**
<code bash>
DATEHOUR=$(date "+%Y%m%d-%H%M%S")
DISKNAME="iscsi"
fio --size=10G --sync=0 --fsync=100 --direct=1 --verify=0 --zero_buffers --invalidate=1 --ioengine=libaio --rw=randrw --rwmixread=50 --bssplit=8k/50:16k/50 --numjobs=50 --iodepth=64 --runtime=120 --time_based --group_reporting --gtod_reduce=1 --filename=fio_pool --name "fio_test_${DISKNAME}-${DATEHOUR}"
</code>