Samsung SATA SSD SMART info.

samsung-smart

#!/bin/sh

get() {
	echo "$SMART_INFO" | awk "/$1/ {print $2}"
}

device_number() {
	printf "%u\n" 0x`stat -c $2 $1`
}

if [ $# -lt 1 ]; then
	echo "$0 <device>" >&2
	exit 1
fi

DEVICE=$1
if [ ! -b "$DEVICE" ]; then
	echo "$DEVICE is not a block device." >&2
	exit 1
fi


MAJOR=`device_number $DEVICE %t`
MINOR=`device_number $DEVICE %T`
MODEL=`cat /sys/dev/block/$MAJOR:$MINOR/device/model`
if [ "`cat /sys/dev/block/$MAJOR:$MINOR/queue/rotational`" -ne 0 ]; then
	echo "$DEVICE is not a SSD." >&2
	exit 1
fi

if ! echo "$MODEL" | grep -qi samsung; then
	echo "$DEVICE ($MODEL) is not a Samsung SSD" >&2
	exit 1
fi

SMARTCTL=`which smartctl`
BC=`which bc`

if [ ! -x "$SMARTCTL" ]; then
	echo "Please install smartmontools properly." >&2
	exit 1
fi

if [ ! -x "$BC" ]; then
	echo "Please install bc properly." >&2
	exit 1
fi

ON_TIME_TAG="Power_On_Hours"
WEAR_COUNT_TAG="Wear_Leveling_Count"
LBAS_WRITTEN_TAG="Total_LBAs_Written"
LBA_SIZE=512 # Value in bytes

BYTES_PER_MB=1048576
BYTES_PER_GB=1073741824
BYTES_PER_TB=1099511627776

SMART_INFO=`sudo $SMARTCTL -A "$DEVICE"`
ON_TIME=`get "$ON_TIME_TAG" "\\$10"`
WEAR_COUNT=`get "$WEAR_COUNT_TAG" "\\$4" | sed 's/^0*//'`
LBAS_WRITTEN=`get "$LBAS_WRITTEN_TAG" "\\$10"`

# Convert LBAs -> bytes
BYTES_WRITTEN=`expr "$LBAS_WRITTEN" \* "$LBA_SIZE"`
MB_WRITTEN=`echo "scale=0; $BYTES_WRITTEN / $BYTES_PER_MB" | $BC`
GB_WRITTEN=`echo "scale=2; $BYTES_WRITTEN / $BYTES_PER_GB" | $BC`
TB_WRITTEN=`echo "scale=2; $BYTES_WRITTEN / $BYTES_PER_TB" | $BC`
WRITE_RATE=`echo "scale=0; $MB_WRITTEN / $ON_TIME" | $BC`

cat <<EOF
Device      : $DEVICE
Model       : $MODEL
On time     : $ON_TIME hr
Health      : $WEAR_COUNT %
Write rate  : $WRITE_RATE MiB/hr
Data written:
              $MB_WRITTEN MiB
              $GB_WRITTEN GiB
              $TB_WRITTEN TiB
EOF

Inspired by

• How can I monitor the TBW on my Samsung SSD?
• Samsung SSDs: Reading Total Bytes Written Under Linux

It can not be used for Samsung NVME!