I was able to restore 389ds data and start service after below exercises.
[ on failed-server] ipa-restore -d --data
/var/lib/ipa/backup/ipa-data--mm-dd-hh-mm-ss
[ on failed-server] systemctl start dirsrv@US--COM.service
[ on failed-server] ipa-replica-manage -v re-initialize
Thanks Marc, and what files / directories exactly to remove?
[1] I see many db file in /var/lib/dirsrv/slapd-US-COM/db/changelog/ directory
aci.db
ancestorid.db
changenumber.db
cn.db
DBVERSION
entryrdn.db
entryusn.db
id2entry.db
nsuniqueid.db
numsubordinates.db
objectclass.db
parentid.db
Restore is one way t proceed.
A quick way to recover the LDAP service in this situation, is to remove the
changelog files and let 389-ds create new ones at start up.
Then check for consistency as much as possible.
Eventually re-init from another replica.
The recovery process may take "some time",