commit or commit synchronize on asw-b-codfw fails with:
fpc2: configuration check succeeds error: failed to copy file '//var/etc/if_alias_map+' to 'fpc7'
Nov 5 09:03:30 asw-b-codfw ffp: LIBJNX_REPLICATE_RCP_ERROR: rcp -l -Ji var/etc/if_alias_map+ fpc7://var/etc/if_alias_map+ : rcp: var/etc/if_alias_map+: Input/output error
Looking around I was not able to find relevant doc. The closest was https://kb.juniper.net/InfoCenter/index?page=content&id=KB36459&showDraft=false or https://kb.juniper.net/InfoCenter/index?page=content&id=KB33527&cat=ROUTER_PRODUCTS&actp=LIST but for a different platform.
As support is expired I'm not able to open a JTAC case (cf. T294792).
One option is to try a master switchover, or more aggressively reboot FPC7, but those can be risky without anyone onsite and no support if it gets worse.