Linux fstrim命令

#!/bin/bash
# configure_trim.sh - 自动配置TRIM优化

echo "=== SSD TRIM 配置工具 ==="

# 1. 检查系统是否使用SSD
echo "1. 检查存储设备..."
if lsblk -d -o name,rota | grep -q "0$"; then
    echo "  ✓ 检测到SSD设备"
else
    echo "  ✗ 未检测到SSD，退出"
    exit 0
fi

# 2. 检查当前TRIM服务状态
echo "2. 检查TRIM服务状态..."
if systemctl is-enabled fstrim.timer >/dev/null 2>&1; then
    echo "  ✓ TRIM服务已启用"
else
    echo "  ✗ TRIM服务未启用"
    read -p "  是否启用每周自动TRIM? (y/n): " -n 1 -r
    echo
    if [[ $REPLY =~ ^[Yy]$ ]]; then
        sudo systemctl enable fstrim.timer
        sudo systemctl start fstrim.timer
        echo "  ✓ TRIM服务已启用"
    fi
fi

# 3. 检查fstab中的discard选项
echo "3. 检查fstab配置..."
if grep -q "discard" /etc/fstab; then
    echo "  ⚠  fstab中包含discard选项（实时TRIM）"
    echo "  注意：实时TRIM可能影响性能，建议使用定期fstrim"
else
    echo "  ✓ fstab中未使用discard选项（推荐）"
fi

# 4. 立即执行一次TRIM
echo "4. 执行TRIM操作..."
read -p "  是否立即执行TRIM? (y/n): " -n 1 -r
echo
if [[ $REPLY =~ ^[Yy]$ ]]; then
    echo "  正在执行TRIM，请稍候..."
    sudo fstrim -av
    echo "  ✓ TRIM操作完成"
fi

echo "=== 配置完成 ==="

#!/bin/bash
# ssd_health_monitor.sh - SSD健康监控

LOG_FILE="/var/log/ssd_health.log"
SMARTCTL=$(which smartctl 2>/dev/null)

log() {
    echo "[$(date '+%Y-%m-%d %H:%M:%S')] $1" | tee -a "$LOG_FILE"
}

check_ssd_health() {
    log "=== SSD健康检查开始 ==="

    # 查找所有SSD设备
    SSDS=$(lsblk -d -o name,rota | awk '$2==0 {print $1}')

    if [ -z "$SSDS" ]; then
        log "未找到SSD设备"
        return 1
    fi

    for SSD in $SSDS; do
        DEVICE="/dev/$SSD"
        log "检查设备: $DEVICE"

        # 检查TRIM支持
        if sudo hdparm -I "$DEVICE" 2>/dev/null | grep -q "TRIM supported"; then
            log "  ✓ 支持TRIM"
        else
            log "  ✗ 不支持TRIM"
        fi

        # 使用smartctl检查健康状态（如果可用）
        if [ -n "$SMARTCTL" ]; then
            if sudo "$SMARTCTL" -H "$DEVICE" 2>/dev/null | grep -q "PASSED"; then
                log "  ✓ SMART健康检测通过"
            else
                ERROR=$(sudo "$SMARTCTL" -H "$DEVICE" 2>/dev/null | grep -i "failed\|error")
                log "  ⚠ SMART检测问题: $ERROR"
            fi

            # 检查剩余寿命
            WEAR_LEVEL=$(sudo "$SMARTCTL" -A "$DEVICE" 2>/dev/null | grep -i "wear leveling\|percent_lifetime_remaining" | head -1)
            if [ -n "$WEAR_LEVEL" ]; then
                log "  📊 $WEAR_LEVEL"
            fi
        fi

        # 检查已使用空间
        USED_SPACE=$(df -h | grep "$DEVICE" | awk '{print $5}' | head -1)
        log "  💾 已使用空间: $USED_SPACE"

        # 检查最后一次TRIM时间
        LAST_TRIM=$(sudo tune2fs -l "$DEVICE"1 2>/dev/null | grep "Last trimmed" | head -1)
        if [ -n "$LAST_TRIM" ]; then
            log "  ⏰ $LAST_TRIM"
        fi
    done

    # 检查TRIM服务状态
    if systemctl is-active fstrim.timer >/dev/null 2>&1; then
        log "✓ TRIM服务运行中"
    else
        log "⚠ TRIM服务未运行"
    fi

    log "=== SSD健康检查结束 ==="
}

# 执行检查
check_ssd_health

#!/bin/bash
# trim_perf_test.sh - TRIM性能测试

TEST_DIR="/tmp/trim_test"
TEST_FILE="$TEST_DIR/large_file.bin"
SIZE="1G"  # 测试文件大小

echo "=== TRIM性能测试 ==="

# 1. 准备工作
echo "1. 创建测试目录..."
sudo mkdir -p "$TEST_DIR"
sudo chmod 777 "$TEST_DIR"

# 2. 测试写入性能（TRIM前）
echo "2. 测试TRIM前写入性能..."
sync
echo 3 | sudo tee /proc/sys/vm/drop_caches > /dev/null

echo "  写入测试文件..."
START_TIME=$(date +%s.%N)
dd if=/dev/zero of="$TEST_FILE" bs=1M count=1024 status=progress 2>&1 | tail -1
END_TIME=$(date +%s.%N)
WRITE_TIME=$(echo "$END_TIME - $START_TIME" | bc)
WRITE_SPEED=$(echo "1024 / $WRITE_TIME" | bc)
echo "  写入速度: $WRITE_SPEED MB/s"

# 3. 删除文件并执行TRIM
echo "3. 删除文件并执行TRIM..."
sudo rm -f "$TEST_FILE"
sync

echo "  执行TRIM操作..."
TRIM_START=$(date +%s.%N)
sudo fstrim /
TRIM_END=$(date +%s.%N)
TRIM_TIME=$(echo "$TRIM_END - $TRIM_START" | bc)
echo "  TRIM耗时: $TRIM_TIME 秒"

# 4. 测试写入性能（TRIM后）
echo "4. 测试TRIM后写入性能..."
sync
echo 3 | sudo tee /proc/sys/vm/drop_caches > /dev/null

echo "  再次写入测试文件..."
START_TIME=$(date +%s.%N)
dd if=/dev/zero of="$TEST_FILE" bs=1M count=1024 status=progress 2>&1 | tail -1
END_TIME=$(date +%s.%N)
WRITE_TIME2=$(echo "$END_TIME - $START_TIME" | bc)
WRITE_SPEED2=$(echo "1024 / $WRITE_TIME2" | bc)
echo "  写入速度: $WRITE_SPEED2 MB/s"

# 5. 清理和结果
sudo rm -rf "$TEST_DIR"

echo "=== 测试结果 ==="
echo "TRIM前写入速度: $WRITE_SPEED MB/s"
echo "TRIM后写入速度: $WRITE_SPEED2 MB/s"
IMPROVEMENT=$(echo "scale=2; ($WRITE_SPEED2 - $WRITE_SPEED) * 100 / $WRITE_SPEED" | bc)
echo "性能变化: $IMPROVEMENT%"

if (( $(echo "$IMPROVEMENT > 0" | bc -l) )); then
    echo "✓ TRIM带来性能提升"
else
    echo "⚠ TRIM未显示明显性能提升"
fi