// Example SMART attributes for SSDs:
{
  "id": 177,
  "name": "Wear_Leveling_Count",
  "value": 94,
  "worst": 94,
  "threshold": 0,
  "raw_value": 6
}

import subprocess

def get_ssd_smart(device='/dev/nvme0'):
    cmd = f"smartctl -a {device}"
    try:
        output = subprocess.check_output(cmd.split()).decode()
        return parse_smart_output(output)
    except subprocess.CalledProcessError as e:
        print(f"Error reading SMART data: {e}")
        return None

#!/bin/bash

THRESHOLD=90
CURRENT=$(smartctl -A /dev/sda | grep "Percentage Used" | awk '{print $4}')

if [ "$CURRENT" -ge "$THRESHOLD" ]; then
    echo "WARNING: SSD wear level at $CURRENT%" | mail -s "SSD Alert" admin@example.com
fi

While originally designed for HDDs, SMART (Self-Monitoring, Analysis and Reporting Technology) has evolved to support SSDs with vendor-specific attributes. Modern SSDs implement SMART through standardized ATA/SCSI commands, though interpretation differs due to SSD's unique failure modes.

Critical SSD-specific SMART attributes include:

# Example SMART attributes for Samsung 870 EVO SSD
Attribute 5: Reallocated_Sector_Count
Attribute 9: Power_On_Hours  
Attribute 170: Available_Reserve_Space
Attribute 171: Program_Fail_Count
Attribute 172: Erase_Fail_Count
Attribute 174: Unexpected_Power_Loss_Count
Attribute 177: Wear_Leveling_Count
Attribute 179: Used_Rsvd_Blk_Cnt_Tot
Attribute 181: Program_Fail_Cnt_Total
Attribute 182: Erase_Fail_Count_Total
Attribute 187: Reported_Uncorrect_Errors
Attribute 194: Temperature_Celsius
Attribute 231: SSD_Life_Left

Here's Python code using smartmontools to read SSD SMART data:

import subprocess

def get_ssd_smart(device='/dev/nvme0'):
    cmd = ['sudo', 'smartctl', '-a', device]
    try:
        output = subprocess.check_output(cmd).decode()
        return parse_smart_output(output)
    except subprocess.CalledProcessError as e:
        print(f"Error reading SMART data: {e}")
        return None

def parse_smart_output(output):
    results = {}
    lines = output.split('\\n')
    for line in lines:
        if line.strip().startswith('Critical Warning'):
            results['critical_warning'] = line.split(':')[1].strip()
        elif 'Available Spare' in line:
            results['available_spare'] = line.split(':')[1].strip()
        elif 'Percentage Used' in line:
            results['percentage_used'] = line.split(':')[1].strip()
    return results

SSD wear indicators require different interpretation than HDD metrics:

// JavaScript example for SSD health calculation
function calculateSSDHealth(smartData) {
    const remainingLife = 100 - smartData.percentage_used;
    const spareBlocks = smartData.available_spare;
    const critical = smartData.critical_warning !== '0x00';
    
    let healthScore = remainingLife * 0.7;
    if (spareBlocks < 10) healthScore *= 0.5;
    if (critical) healthScore = 0;
    
    return Math.max(0, Math.min(100, healthScore));
}

For system administrators managing mixed environments:

# PowerShell script for Windows SSD monitoring
$diskDrives = Get-PhysicalDisk | Where-Object { $_.MediaType -eq 'SSD' }

foreach ($disk in $diskDrives) {
    $smart = Get-StorageReliabilityCounter -PhysicalDisk $disk
    [PSCustomObject]@{
        DeviceId = $disk.DeviceId
        Model = $disk.FriendlyName
        Temperature = $smart.Temperature
        Wear = $smart.Wear
        ReadErrors = $smart.ReadErrorsTotal
        WriteErrors = $smart.WriteErrorsTotal
    }
}

Critical thresholds for enterprise environments:

• Available spare blocks < 5%
• Wear leveling count > manufacturer's TBW rating
• Uncorrectable error count > 0
• Media errors or CRC errors increasing rapidly

Example Nagios check for SSD health:

#!/bin/bash
WARNING=10
CRITICAL=5

HEALTH=$(smartctl -a /dev/nvme0 | grep -i 'percentage used' | awk '{print $3}' | cut -d'%' -f1)
AVAIL_SPARE=$(smartctl -a /dev/nvme0 | grep -i 'available spare' | awk '{print $4}' | cut -d'%' -f1)

if [ $HEALTH -ge $CRITICAL ]; then
    echo "CRITICAL: SSD at ${HEALTH}% remaining life"
    exit 2
elif [ $HEALTH -ge $WARNING ]; then
    echo "WARNING: SSD at ${HEALTH}% remaining life"
    exit 1
else
    echo "OK: SSD at ${HEALTH}% remaining life, ${AVAIL_SPARE}% spare"
    exit 0
fi