Customer upgraded the JUNOS from 21.4 to 23.2R2.21 and saw different size of memory size of SPC3 card. The displayed CPU DRAM decreased to 1760MB from 3168MB.
23.2:
Slot 8 information:
State Online
Temperature 52 degrees C / 125 degrees F
Total CPU DRAM 1760 MB
FIPS Capable True
FIPS Mode False
Start time 2024-07-04 04:35:26 UTC
Uptime 3 days, 21 hours, 22 minutes, 8 seconds
Max power consumption 650 Watts
21.4
Temperature 62 degrees C / 143 degrees F
Total CPU DRAM 3168 MB
FIPS Capable False
The Total CPU DRAM displays as 1760MB instead of 3168MB in 23.2R2.21.
According to Juniper engineering team, this is an expected behavior after 22.1R1 as a result of memory optimization, there won't have service impacts with the changes.