archiver errors: FAILED (duplicates: 8)

[franxav06]

Hello
I have the a problem of duplicated wal files on a server on a replicated database barman backup server
Server xxxxxxxxxx02b:
PostgreSQL: OK
superuser or standard user with backup privileges: OK
PostgreSQL streaming: OK
wal_level: OK
replication slot: OK
directories: OK
retention policy settings: OK
backup maximum age: OK (no last_backup_maximum_age provided)
backup minimum size: OK (1.9 GiB)
wal maximum age: OK (no last_wal_maximum_age provided)
wal size: OK (0 B)
compression settings: OK
failed backups: OK (there are 0 failed backups)
minimum redundancy requirements: OK (have 7 backups, expected at least 7)
ssh: OK (PostgreSQL server)
systemid coherence: OK
pg_receivexlog: OK
pg_receivexlog compatible: OK
receive-wal running: OK
archive_mode: OK
archive_command: OK
continuous archiving: OK
archiver errors: FAILED (duplicates: 8)

Here under the traces from the log

2024-02-07 03:15:23,531 [911882] barman.server INFO: Received file '00000001000000030000006D' with checksum '925b30ed0a852651fe5d418cd4df84e6' by put-wal for server 'XXXXXXXXX02b' (SSH host: XX.XXX.XXX.XX)
2024-02-07 03:15:26,216 [911869] barman.copy_controller INFO: Copy step 3 of 5: [bucket 0] finished (duration: 22 seconds) copy safe files from remote PGDATA directory: /var/lib/pgsql/15/data/
2024-02-07 03:15:26,243 [911869] barman.copy_controller INFO: Copy step 4 of 5: [bucket 0] starting copy files with checksum from remote PGDATA directory: /var/lib/pgsql/15/data/
2024-02-07 03:15:26,569 [911869] barman.copy_controller INFO: Copy step 4 of 5: [bucket 0] finished (duration: less than one second) copy files with checksum from remote PGDATA directory: /var/lib/pgsql/15/data/
2024-02-07 03:15:26,570 [911869] barman.copy_controller INFO: Copy step 5 of 5: [global] starting copy remote pg_control file: /var/lib/pgsql/15/data/global/pg_control
2024-02-07 03:15:26,722 [911869] barman.copy_controller INFO: Copy step 5 of 5: [global] finished (duration: less than one second) copy remote pg_control file: /var/lib/pgsql/15/data/global/pg_control
2024-02-07 03:15:26,723 [911849] barman.copy_controller INFO: Copy finished (safe before 2024-02-06 03:15:03.221710+01:00)
2024-02-07 03:15:26,743 [911849] barman.backup_executor INFO: Copy done (time: 22 seconds)
2024-02-07 03:15:26,745 [911849] barman.backup_executor INFO: Asking PostgreSQL server to finalize the backup.
2024-02-07 03:15:29,252 [911849] barman.backup INFO: Backup size: 1.9 GiB. Actual size on disk: 1.6 GiB (-14.40% deduplication ratio).
2024-02-07 03:15:29,253 [911849] barman.backup INFO: Backup end at LSN: 3/6D0000D8 (00000001000000030000006D, 000000D8)
2024-02-07 03:15:29,253 [911849] barman.backup INFO: Backup completed (start time: 2024-02-07 03:15:02.725770, elapsed time: 26 seconds)
2024-02-07 03:15:29,253 [911849] barman.server INFO: Waiting for the WAL file 00000001000000030000006D from server 'lavdcpgsql02b'
2024-02-07 03:15:29,255 [911849] barman.wal_archiver INFO: Found 2 xlog segments from streaming for lavdcpgsql02b. Archive all segments in one run.
2024-02-07 03:15:29,255 [911849] barman.wal_archiver INFO: Archiving segment 1 of 2 from streaming: lavdcpgsql02b/00000001000000030000006C
2024-02-07 03:15:29,931 [911849] barman.wal_archiver INFO: Archiving segment 2 of 2 from streaming: lavdcpgsql02b/00000001000000030000006D
2024-02-07 03:15:30,054 [911849] barman.wal_archiver INFO: Found 2 xlog segments from file archival for lavdcpgsql02b. Archive all segments in one run.
2024-02-07 03:15:30,054 [911849] barman.wal_archiver INFO: Archiving segment 1 of 2 from file archival: lavdcpgsql02b/00000001000000030000006C
2024-02-07 03:15:30,183 [911849] barman.wal_archiver INFO:      Error: 00000001000000030000006C is already present in server lavdcpgsql02b. File moved to errors directory.
2024-02-07 03:15:30,183 [911849] barman.wal_archiver INFO: Archiving segment 2 of 2 from file archival: lavdcpgsql02b/00000001000000030000006D
2024-02-07 03:15:30,274 [911849] barman.wal_archiver INFO:      Error: 00000001000000030000006D is already present in server lavdcpgsql02b. File moved to errors directory.

And here the configuration for WALs in postgresql.conf

`#------------------------------------------------------------------------------

WRITE-AHEAD LOG

#------------------------------------------------------------------------------

- Settings -

wal_level = replica # minimal, replica, or logical
# (change requires restart)
fsync = on # flush data to disk for crash safety
# (turning this off can cause
# unrecoverable data corruption)
#synchronous_commit = on # synchronization level;
# off, local, remote_write, remote_apply, or on
#wal_sync_method = fsync # the default is the first option
# supported by the operating system:
# open_datasync
# fdatasync (default on Linux and FreeBSD)
# fsync
# fsync_writethrough
# open_sync
#full_page_writes = on # recover from partial page writes
wal_log_hints = on # also do full page writes of non-critical updates
# (change requires restart)
#wal_compression = off # enables compression of full-page writes;
# off, pglz, lz4, zstd, or on
#wal_init_zero = on # zero-fill new WAL files
#wal_recycle = on # recycle WAL files
#wal_buffers = -1 # min 32kB, -1 sets based on shared_buffers
# (change requires restart)
#wal_writer_delay = 200ms # 1-10000 milliseconds
#wal_writer_flush_after = 1MB # measured in pages, 0 disables
#wal_skip_threshold = 2MB

#commit_delay = 0 # range 0-100000, in microseconds
#commit_siblings = 5 # range 1-1000

- Checkpoints -

#checkpoint_timeout = 5min # range 30s-1d
#checkpoint_completion_target = 0.9 # checkpoint target duration, 0.0 - 1.0
#checkpoint_flush_after = 256kB # measured in pages, 0 disables
#checkpoint_warning = 30s # 0 disables
max_wal_size = 1GB
min_wal_size = 80MB

- Prefetching during recovery -

#recovery_prefetch = try # prefetch pages referenced in the WAL?
#wal_decode_buffer_size = 512kB # lookahead window used for prefetching
# (change requires restart)

- Archiving -

archive_mode = on # enables archiving; off, on, or always
# (change requires restart)
#archive_library = '' # library to use to archive a logfile segment

archive_command = 'barman-wal-archive xxxxxbarman01a xxxxxpgsql02b %p' # command to use to archive a logfile segment
# placeholders: %p = path of file to archive
# %f = file name only

`
Thanks in advance for your help

Francesco