시스템 관리_06 LVM 이벤트 감시 실패(Failed to start LVM event inspection) 및 볼륨 비활성화 문제 해결 가이드

# 1. systemd 서비스 상태 확인 (lvm2-monitor 실패 감지)
$ systemctl status lvm2-monitor.service
● lvm2-monitor.service - Monitoring of LVM2 mirrors, snapshots etc. using dmeventd or progress polling
     Loaded: loaded (/usr/lib/systemd/system/lvm2-monitor.service; enabled; vendor preset: enabled)
     Active: failed (Result: exit-code) since Fri 2026-09-18 08:30:12 KST; 5min ago
       Docs: man:dmeventd(8)
             man:lvcreate(8)
             man:lvm.conf(5)
    Process: 852 ExecStart=/usr/sbin/lvm vgchange --monitor y (code=exited, status=5)
   Main PID: 852 (code=exited, status=5)

Sep 18 08:30:12 node01 systemd[1]: Starting Monitoring of LVM2 mirrors, snapshots etc....
Sep 18 08:30:12 node01 lvm[852]:   Failed to connect to dmeventd.
Sep 18 08:30:12 node01 lvm[852]:   Failed to start LVM event inspection.
Sep 18 08:30:12 node01 systemd[1]: lvm2-monitor.service: Main process exited, code=exited, status=5/NOTINSTALLED
Sep 18 08:30:12 node01 systemd[1]: lvm2-monitor.service: Failed with result 'exit-code'.
Sep 18 08:30:12 node01 systemd[1]: Failed to start Monitoring of LVM2 mirrors, snapshots etc. using dmeventd or progress polling.

# 2. LVM 볼륨 상태 점검 (LV 활성화 여부 확인)
$ lvs -a -o lv_name,vg_name,lv_attr,size
  LV       VG        Attr       LSize
  root     vg_system -wi-ao---- 50.00g
  swap     vg_system -wi-ao----  8.00g
  lv_data  vg_data   -wi------- 200.00g

# [분석] Attr의 5번째 플래그가 'a'(active)가 아닌 '-'로 표시되어 lv_data 볼륨이 비활성화 상태임.

# 3. dmeventd 관련 소켓 및 데몬 상태 점검
$ systemctl status dm-event.socket dm-event.service
● dm-event.socket - Device-mapper event daemon FIFO
     Loaded: loaded (/usr/lib/systemd/system/dm-event.socket; enabled; vendor preset: enabled)
     Active: inactive (dead)

#!/bin/bash
# ==============================================================================
# Script: fix_lvm_activation_and_monitor.sh
# Purpose: dmeventd 및 lvm2-monitor 복구와 비활성 LVM 볼륨 강제 활성화
# ==============================================================================

set -euo pipefail

echo "=========================================================="
echo "          [1] LVM 데몬 및 소켓 상태 확인"
echo "=========================================================="

# dm-event 소켓/데몬 정상화
if ! systemctl is-active --quiet dm-event.socket; then
    echo "[조치] dm-event.socket 활성화 및 기동..."
    systemctl restart dm-event.socket
fi

if ! systemctl is-active --quiet dm-event.service; then
    echo "[조치] dm-event.service 기동..."
    systemctl restart dm-event.service || true
fi

echo ""
echo "=========================================================="
echo "          [2] LVM 볼륨 그룹(VG) 및 논리 볼륨(LV) 활성화"
echo "=========================================================="

echo "[작업] 비활성화된 LVM 볼륨 일괄 활성화 수행 (vgchange -ay)..."
vgchange -ay

echo ""
echo "[상태 확인] 현재 LV 활성화 상태:"
lvs -a -o lv_name,vg_name,lv_attr,size,pool_lv

echo ""
echo "=========================================================="
echo "          [3] lvm2-monitor 서비스 복구 및 재시작"
echo "=========================================================="

echo "[작업] lvm2-monitor 재시작 및 모니터링 활성화..."
systemctl reset-failed lvm2-monitor.service 2>/dev/null || true
if systemctl restart lvm2-monitor.service; then
    echo "[성공] lvm2-monitor.service가 정상적으로 시작되었습니다."
else
    echo "(!) 경고: lvm2-monitor 기동 실패. lvm.conf 모니터링 설정 점검 필요."
    echo "(!) 임시 우회: lvm.conf의 monitoring = 0 설정을 고려하십시오."
fi

systemctl status lvm2-monitor.service --no-pager

echo ""
echo "=========================================================="
echo "          [4] 마운트 실패된 파일시스템 확인"
echo "=========================================================="
echo "[작업] mount -a 실행을 통한 누락 마운트 일괄 복구..."
mount -a
df -h -x tmpfs -x devtmpfs