IBM Spectrum Protect を使用した FlexGroup NDMP バックアップの失敗

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環境

ONTAP 9
FlexGroup
NDMP （ Network Data Management Protocol ；ネットワークデータ管理プロトコル）
IBM Spectrum Protect

問題

FlexVol を使用した NDMP バックアップは正常に動作しています
フェーズ III で FlexGroup NDMP バックアップが次のエラーで失敗します。 Write to socket failed

バックアップログ

dmp Wed Mar 16 17:22:15 CET 2022 TSM /vserver/flexgroup_volume (Phase_change (I)
 dmp Wed Mar 16 17:22:15 CET 2022 TSM /vserver/flexgroup_volume (Phase_change (II)
 dmp Wed Mar 16 17:22:15 CET 2022 TSM /vserver/flexgroup_volume (Phase_change (III)
 dmp Wed Mar 16 17:22:16 CET 2022 TSM /vserver/flexgroup_volume (Log_msg (Write DIRNET for BKP ID=480, type=3 failed because bkp_out is closing.
 dmp Wed Mar 16 17:22:16 CET 2022 TSM /vserver/flexgroup_volume (Error (Write to socket failed
 dmp Wed Mar 16 17:22:17 CET 2022 TSM /vserver/flexgroup_volume (Tape_close (ndmp)
 dmp Wed Mar 16 17:22:17 CET 2022 TSM /vserver/flexgroup_volume (Log_msg (Flush DIRNET called on error = 4.
 dmp Wed Mar 16 17:22:17 CET 2022 TSM /vserver/flexgroup_volume (Abort (8 MB, 3 secs, 2 MBps)
 dmp Wed Mar 16 17:22:17 CET 2022 TSM /vserver/flexgroup_volume (Error (DUMP IS ABORTED

NDMP ログ

Wed Mar 16 2022 17:22:16 +01:00 [kern_ndmpd:info:8177] [91470]  DEBUG: S<BKUP (ndmp_server) BR2NDMPD_LOG_MESSAGE
 Wed Mar 16 2022 17:22:16 +01:00 [kern_ndmpd:info:8177] [91470]  DEBUG:    sess_handle 0x40600000002 seq 17 (0x11)
 Wed Mar 16 2022 17:22:16 +01:00 [kern_ndmpd:info:8177] [91470]  DEBUG:    log_type 2 (LOG_TYPE ERROR)
 Wed Mar 16 2022 17:22:16 +01:00 [kern_ndmpd:info:8177] [91470]  DEBUG:    msg (DUMP: Error: Write to socket failed\n)
 Wed Mar 16 2022 17:22:16 +01:00 [kern_ndmpd:info:8177] [91470]  DEBUG: S>BKUP (ndmp_server) BR2NDMPD_LOG_MESSAGE
 Wed Mar 16 2022 17:22:16 +01:00 [kern_ndmpd:info:8177] [91470]  DEBUG: COMMON_State::posts_log_message called
 Wed Mar 16 2022 17:22:16 +01:00 [kern_ndmpd:info:8177] [91470]  DEBUG: DMA<<S V4 sequence=180 (0xb4)
 Wed Mar 16 2022 17:22:16 +01:00 [kern_ndmpd:info:8177] [91470]  DEBUG:    Time_stamp=0x62320eb8 (Mar 16 17:22:16 2022)
 Wed Mar 16 2022 17:22:16 +01:00 [kern_ndmpd:info:8177] [91470]  DEBUG:    message type=0 (NDMP4_MESSAGE_REQUEST)
 Wed Mar 16 2022 17:22:16 +01:00 [kern_ndmpd:info:8177] [91470]  DEBUG:    message_code=0x603 (NDMP4_LOG_MESSAGE)
 Wed Mar 16 2022 17:22:16 +01:00 [kern_ndmpd:info:8177] [91470]  DEBUG:    reply_sequence=0 (0x0)
 Wed Mar 16 2022 17:22:16 +01:00 [kern_ndmpd:info:8177] [91470]  DEBUG:    error_code=0 (NDMP4_NO_ERR)
 Wed Mar 16 2022 17:22:16 +01:00 [kern_ndmpd:info:8177] [91470]  DEBUG:    log_type=2 (NDMP4_LOG_ERROR)
 Wed Mar 16 2022 17:22:16 +01:00 [kern_ndmpd:info:8177] [91470]  DEBUG:    message_id=15 (0xf)
 Wed Mar 16 2022 17:22:16 +01:00 [kern_ndmpd:info:8177] [91470]  DEBUG:    entry='DUMP: Error: Write to socket failed\n'