We have a PS4100X and today we face an equipment failure, and we were unable to access any lun by any of the configured hosts. We also didn't get any management access, that is, completely unavailable.

We performed a complete shutdown with the removal of electrical connections, we waited an interval of 30 minutes and when we reconnected the equipment, all the disks, arrays, luns presented, everything was working correctly and we went up our productive environment.

I would like to understand what happened, but in the evidence, I have only one note that I could not find in research here in the community, or even on google:

The log follows, where we can identify an interval without any occurrence. Please, can anyone point me to any reason for this behavior? Another question, does anyone know anything about this event? EVENT_NEAR_UNEXPECTED_REBOOT: Warning

*************************************
* Events related to Control Modules *
*************************************
197: 195: BRZ: SP: 20-Jan-2021 15: 17: 41.190195: cache_driver.cc: 1058: INFO :: 28.2.39: Active control module cache set to write-back mode.
107: 107: BRZ: SP: 20-Jan-2021 15: 17: 17.610107: ppool_nvram.c: 380: WARNING :: 15.3.0: NVRAM contains valid data. This is a POWER FAILURE RECOVERY.
323: 110: BRZ: SP [secondary]: 20-Jan-2021 15: 17: 08.840000: ppool_nvram.c: 380: WARNING :: 15.3.0: NVRAM contains valid data. This is a POWER FAILURE RECOVERY.
120850: 14047: BRZ: SP: 20-Jan-2021 13: 09: 44.931759:: EVENT_NEAR_UNEXPECTED_REBOOT: Warning health conditions currently exist.

Correct these conditions before they affect array operation.

EVENT_NEAR_UNEXPECTED_REBOOT: Power supply failure.

EVENT_NEAR_UNEXPECTED_REBOOT: There are 1 outstanding health conditions. Correct these conditions before they affect array operation.
91903: 1977: BRZ: SP: 14-Jul-2020 23: 08: 07.231977: emm.c: 2363: WARNING :: 28.3.51: Warning health conditions currently exist.

Correct these conditions before they affect array operation.

More spare drives are expected.

There are 1 outstanding health conditions. Correct these conditions before they affect array operation.
91886: 1965: BRZ: SP: 14-Jul-2020 09: 56: 57.101965: emm.c: 2363: WARNING :: 28.3.51: Warning health conditions currently exist.

Currently applied versions:
Controller Part Number: 70-0476
Controller Type: Type 12: Two Fingers
Controller Revision Number: A06
Controller ECO Number: C01
Boot ROM Version Number: 3.6.4
FPGA Version Number: 2.5
Active CM SEP Version Number: A011
Passive CM SEP Version Number: A011
Maxim Power Seq Firmware Version: 1.6
C2F Hardware Version: 2.8
C2F Firmware Version: 2.4
C2F Power Module Version: A01
C2F Power Module ECO Number: C00
Power CPLD Version Number: 2.3