CHASSIS FAN FRU FAILED: SP/BMCをアップグレードした後でも複数のファンが故障しています

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環境

FAS2620 / FAS2650 / AFF A200
FAS2720 / FAS2750 / AFF A220
FAS8200 / AFF A300

問題

EMSエラーで複数のセンサーが利用不可と表示される：

[Cluster: env_mgr: monitor.fan.warning:notice]: multiple fans have failed. Replace it to avoid overheating [Cluster: env_mgr: monitor.temp.unreadable:error]: The controller temperature (Module B Expander Temp) is not readable. [Cluster: env_mgr: monitor.temp.unreadable:error]: The controller temperature (Module A Expander Temp) is not readable. [Cluster: env_mgr: monitor.temp.unreadable:error]: The controller temperature (Midplane 4 Temp) is not readable. [Cluster: env_mgr: monitor.temp.unreadable:error]: The controller temperature (Midplane 3 Temp) is not readable. [Cluster: env_mgr: monitor.temp.unreadable:error]: The controller temperature (Midplane 2 Temp) is not readable. [Cluster: env_mgr: monitor.temp.unreadable:error]: The controller temperature (Midplane 1 Temp) is not readable. [Cluster: env_mgr: monitor.temp.unreadable:error]: The controller temperature (Ambient Temp) is not readable. [Cluster: env_mgr: callhome.c.fan.fru.fault:error]: Call home for CHASSIS FAN FRU FAILED: Multiple fans have failed

高い SP 負荷はイベントログ（SP-LATEST-SYSTEM-EVENT-LOG）に記録される場合があります：

[SP.notice]: SP load is high: 2.62 2.37 2.04 [SP.notice]: SP load is high: 2.71 2.31 2.08

SP-LATEST-SYSLOG 出力における env_mgr エラーの繰り返し発生：

env_mgr[1356]: Error opening ses, err -1 env_mgr[1356]: cdev_reopen: error opening device 'ses', err -1. env_mgr[1356]: cdevices_poll_pending: cdev(2001) re-open, state is 4.