56 lines
2.0 KiB
Plaintext
56 lines
2.0 KiB
Plaintext
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#!/bin/bash
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# from http://www.jdgleaver.co.uk/blog/2014/05/23/samsung_ssds_reading_total_bytes_written_under_linux.html
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# get the lifetime writes and health of an ssd
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#######################################
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# Variables #
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#######################################
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SSD_DEVICE="$1"
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ON_TIME_TAG="Power_On_Hours"
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WEAR_COUNT_TAG="Wear_Leveling_Count"
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LBAS_WRITTEN_TAG="Total_LBAs_Written"
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LBA_SIZE=512 # Value in bytes
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BYTES_PER_MB=1048576
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BYTES_PER_GB=1073741824
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BYTES_PER_TB=1099511627776
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#######################################
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# Get total data written... #
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#######################################
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# Get SMART attributes
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SMART_INFO=$(sudo /usr/sbin/smartctl -A "$SSD_DEVICE")
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# Extract required attributes
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ON_TIME=$(echo "$SMART_INFO" | grep "$ON_TIME_TAG" | awk '{print $10}')
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WEAR_COUNT=$(echo "$SMART_INFO" | grep "$WEAR_COUNT_TAG" | awk '{print $4}' | sed 's/^0*//')
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LBAS_WRITTEN=$(echo "$SMART_INFO" | grep "$LBAS_WRITTEN_TAG" | awk '{print $10}')
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# Convert LBAs -> bytes
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BYTES_WRITTEN=$(echo "$LBAS_WRITTEN * $LBA_SIZE" | bc)
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MB_WRITTEN=$(echo "scale=3; $BYTES_WRITTEN / $BYTES_PER_MB" | bc)
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GB_WRITTEN=$(echo "scale=3; $BYTES_WRITTEN / $BYTES_PER_GB" | bc)
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TB_WRITTEN=$(echo "scale=3; $BYTES_WRITTEN / $BYTES_PER_TB" | bc)
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# Output results...
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echo "------------------------------"
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echo " SSD Status: $SSD_DEVICE"
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echo "------------------------------"
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echo " On time: $(echo $ON_TIME | sed ':a;s/\B[0-9]\{3\}\>/,&/;ta') hr"
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echo "------------------------------"
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echo " Data written:"
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echo " MB: $(echo $MB_WRITTEN | sed ':a;s/\B[0-9]\{3\}\>/,&/;ta')"
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echo " GB: $(echo $GB_WRITTEN | sed ':a;s/\B[0-9]\{3\}\>/,&/;ta')"
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echo " TB: $(echo $TB_WRITTEN | sed ':a;s/\B[0-9]\{3\}\>/,&/;ta')"
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echo "------------------------------"
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echo " Mean write rate:"
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echo " MB/hr: $(echo "scale=3; $MB_WRITTEN / $ON_TIME" | bc | sed ':a;s/\B[0-9]\{3\}\>/,&/;ta')"
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echo "------------------------------"
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echo " Drive health: ${WEAR_COUNT} %"
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echo "------------------------------"
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