Switch Log empty after power outage

[Silence4eveR]

Hello,
unfortunately I had to realize that the switch logs are empty after a power failure. Or the last entries are several weeks old (Power failure was on 17.01.25 the last log entries are from 06.12.24. I know for sure that there were log entries because I checked the log on a switch last week). Is this normal? How can I change this?  This has happened with 8  pieces with the following Firmware 32.7.1.9-patch1-49 and models X440-G2-24T-G4, X460-G2-48T-10G4, 5420F-24T-4XE- Switch Engin

log settings:

 # show log configuration
Debug-Mode: Disabled
Show Message Privilege: Administrative
Enabled TLS Ciphers: aes128-sha, aes128-sha256, aes256-sha256, dhe-rsa-aes128-sha256, dhe-rsa-aes256-sha256
Disabled TLS Ciphers: None
Syslog TLS TCP User Timeout: Default
Syslog TLS OCSP: On
Syslog TLS OCSP Attributes:
Nonce : Off
Signer ocsp-nocheck : Off
Override Server URL : None

Log Target : memory-buffer
Enabled : yes
Filter Name : DefaultFilter
Match regex : Any
Severity : Debug-Data (through Critical)
Format : MM/DD/YYYY HH:MM:SS.hh <Severity:Component.SubComponent.Condition>
Buffer size : 1000 messages
Percent Full : 62%
Full Alert : 90%

Log Target : nvram
Enabled : yes
Filter Name : DefaultFilter
Match regex : Any
Severity : Warning (through Critical)
Format : MM/DD/YYYY HH:MM:SS.hh <Severity:Component.SubComponent.Condition>

Log Target : console
Enabled : no
Filter Name : DefaultFilter
Match regex : Any
Severity : Info (through Critical)
Format : MM/DD/YYYY HH:MM:SS.hh <Severity:Component.SubComponent.Condition>

kind regards
Silence4eveR

[teresa32yon]

Hi Silence4eveR,

I'm sorry to hear about the issue with your switch logs. It sounds frustrating, especially since you know there should be recent entries.

From what I've found, it seems that after a power failure, the logs might not be retained due to how the switch handles log storage. However, logs with severity levels Warning through Critical should be retained in the NVRAM. You can check these logs with the command show log messages nvram.

If the logs are still missing, it might be worth checking if there's a firmware update available for your switches that addresses this issue.

[OscarK]

This by design. Logs with severity Warning through Critical are retained after a power outage in the nvram which you can see with below command.

show log messages nvram