The error ping: sendto: No space left on device along with the system alarm indicating that the /var partition is full (/var partition usage is high) suggests that your device's disk space for the /var directory is running low, which is causing the ping command to fail.

Below errors are seen while executing the ping.

switch> ping 10.122.XX.XX

PING 10.122.XX.XX (10.122.XX.XX): 56 data bytes

ping: sendto: No space left on device

ping: sendto: No space left on device

ping: sendto: No space left on device

switch> show chassis alarms

1 alarms currently active

Alarm time Class Description

2024-12-10 19:28:28 ICT Minor RE 1 /var partition usage is high

{master:1}

switch> show system alarms

1 alarms currently active

Alarm time Class Description

2024-12-10 19:28:28 ICT Minor RE 1 /var partition usage is high

Steps to Resolve the Issue:

• Try "request system storage cleanup"
• Reboot the switch

Referred below KB:

https://supportportal.juniper.net/s/article/EX-QFX-How-to-troubleshoot-var-partition-usage-is-high