How can I confirm graceful shutdown from low UPS battery?

Hi Everyone,

My area had a power outage in the middle of the night that outlasted my UPS battery. As many of you would do, I slept through the outage soundly knowing I am protected by OMV RAID, quality drives and UPS, the nut plug-in, and a backup/restore strategy. I believe my server shut down gracefully when the battery became low, though I'm not sure how to confirm. I was relieved to find no scary fsck 'not clean' or 'fixing this block or the other' warnings upon bootup, but I didn't find any comforting 'booting from graceful shutdown' messages either. How can I confirm a graceful shutdown? Pertinent info and logs follow.

Versions:

openmediavault 6.0.30-1

openmediavault-keyring 1.0

openmediavault-nut 6.0.1-1

openmediavault-omvextrasorg 6.1

<power loss>

Sep 25 02:25:56 vault upsmon[1808]: UPS ups on battery

Sep 25 02:25:56 vault upssched[1946083]: Executing command: notify

Sep 25 02:25:56 vault upssched-cmd: UPS ups - Line Power Fail, system running on battery power

<snip>

Sep 25 02:25:57 vault postfix/smtp[1946099]: 796A01C021B: replace: header Subject: UPS notification from x: Subject: [vault.local] UPS notification from vault

<snip>

Sep 25 04:24:31 vault upsmon[1808]: UPS ups battery is low

Sep 25 04:24:31 vault upsd[1804]: Client monmaster@127.0.0.1 set FSD on UPS [ups]

Sep 25 04:24:31 vault upsmon[1808]: Executing automatic power-fail shutdown

Sep 25 04:24:31 vault upsmon[1808]: Auto logout and shutdown proceeding

Sep 25 04:24:31 vault upssched[1949007]: Executing command: notify

Sep 25 04:24:31 vault upssched[1949012]: Executing command: notify

Sep 25 04:24:31 vault upssched-cmd: UPS ups - Low battery power

Sep 25 04:24:31 vault upssched-cmd: Automatic logout and shutdown proceeding

<snip>

Sep 25 04:24:34 vault postfix/smtp[1949039]: 180B01C015F: replace: header Subject: UPS notification from x: Subject: [vault.local] UPS notification from vault

Sep 25 04:24:37 vault systemd[1]: nut-monitor.service: Succeeded.

Sep 25 04:24:37 vault systemd[1]: nut-monitor.service: Consumed 2min 22.844s CPU time.

Sep 25 04:24:37 vault systemd[1]: Removed slice system-modprobe.slice.

<no further log until power on>

<power on manually>

Sep 25 08:50:39 vault systemd[1]: Finished Coldplug All udev Devices.

Sep 25 08:50:39 vault kernel: [ 0.000000] microcode: microcode updated early to revision 0x59, date = 2023-02-26

Sep 25 08:50:39 vault kernel: [ 0.000000] Linux version 5.14.0-0.bpo.2-amd64 (debian-kernel@lists.debian.org) (gcc-10 (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2) #1 SMP Debian 5.14.9-2~bpo11+1 (2021-10-10)

Thanks,

Steve

Right, I received the 2 messages at shutdown, each a single line

1. "UPS ups - Low battery power"

2. "Automatic logout and shutdown proceeding"

I put more stock in system log files than info I receive via email. I was hoping to find logged confirmation of a proper shutdown, but perhaps Debian does not do such logging. In any event it appears the shutdown worked just fine.