[pgpool-general-jp: 494] connect_inet_domain_socket: connect() failed発生

[sugimoto kei]

お世話になります。
 
pgpool-3.4.1においてWeb２台、DB2台でレプリケーション構成をとっています。
下記のDB01にネットワーク的に接続できず、fail overしてしまったのですが、
該当時間にネットワーク的な障害やOSレベルでのNICエラー、DB01の障害もありませんでした。
 
「connect_inet_domain_socket: connect() failed: No route to host」
のエラーが発生するケースはどういったものが考えられますでしょうか？
 
2008-10-08 15:01:03 LOG:   pid 1432: starting health checking2008-10-08 15:02:03 LOG:   pid 1432: starting health checking2008-10-08 15:03:03 LOG:   pid 1432: starting health checking2008-10-08 15:03:40 ERROR: pid 29331: connect_inet_domain_socket: connect() failed: No route to host2008-10-08 15:03:40 LOG:   pid 29331: notice_backend_error: master: 1 fail over request from pid 293312008-10-08 15:03:49 ERROR: pid 1432: connect_inet_domain_socket: connect() failed: No route to host2008-10-08 15:03:49 ERROR: pid 1432: health check failed. master DB01 at port 5432 is down2008-10-08 15:03:49 LOG:   pid 1432: starting degeneration. shutdown master host DB01(5432)2008-10-08 15:03:49 LOG:   pid 1432: degeneration done. shutdown master host DB01(5432)2008-10-08 15:04:02 ERROR: pid 1043: connect_inet_domain_socket: connect() failed: No route to host2008-10-08 15:04:02 LOG:   pid 1043: notice_backend_error: master: 1 fail over request from pid 10432008-10-08 15:04:08 ERROR: pid 1047: connect_inet_domain_socket: connect() failed: No route to host2008-10-08 15:04:08 ERROR: pid 1065: connect_inet_domain_socket: connect() failed: No route to host2008-10-08 15:04:08 LOG:   pid 1047: notice_backend_error: master: 1 fail over request from pid 10472008-10-08 15:04:08 LOG:   pid 1065: notice_backend_error: master: 1 fail over request from pid 10652008-10-08 15:04:12 ERROR: pid 1044: connect_inet_domain_socket: connect() failed: No route to host2008-10-08 15:04:12 ERROR: pid 1064: connect_inet_domain_socket: connect() failed: No route to host2008-10-08 15:04:12 ERROR: pid 1066: connect_inet_domain_socket: connect() failed: No route to host2008-10-08 15:04:12 LOG:   pid 1044: notice_backend_error: master: 1 fail over request from pid 10442008-10-08 15:04:12 LOG:   pid 1064: notice_backend_error: master: 1 fail over request from pid 10642008-10-08 15:04:12 LOG:   pid 1066: notice_backend_error: master: 1 fail over request from pid 10662008-10-08 15:04:15 ERROR: pid 1048: connect_inet_domain_socket: connect() failed: No route to host2008-10-08 15:04:15 ERROR: pid 1070: connect_inet_domain_socket: connect() failed: No route to host2008-10-08 15:04:15 LOG:   pid 1048: notice_backend_error: master: 1 fail over request from pid 10482008-10-08 15:04:15 LOG:   pid 1070: notice_backend_error: master: 1 fail over request from pid 1070
 
以上ご回答いただければ幸いです。
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