Проблемы монтирования raid5 массива

Доброго времени суток!
Имеется RAID 5 массив
# smartctl -a /dev/sdd
smartctl 6.6 2016-05-31 r4324 [i686-linux-4.9.0-8-686-pae] (local build)
Copyright (C) 2002-16, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Vendor: ASR8805
Product: a0
Revision: V1.0
User Capacity: 17 990 533 775 360 bytes [17,9 TB]
Logical block size: 512 bytes
Physical block size: 8388608 bytes
Lowest aligned LBA: 9217
Logical Unit id: 0xfde9a4a700d00000
Serial number: A7A4E9FD
Device type: disk
Local Time is: Wed Mar 25 22:38:10 2020 MSK
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
Temperature Warning: Disabled or Not Supported

=== START OF READ SMART DATA SECTION ===
SMART Health Status: OK
Current Drive Temperature: 0 C
Drive Trip Temperature: 0 C

Error Counter logging not supported

Device does not support Self Test logging




Пытаюсь создать на этом массиве GPT заголовок

# gdisk /dev/sdd
GPT fdisk (gdisk) version 1.0.1

Warning! Read error 27; strange behavior now likely!
Caution: invalid backup GPT header, but valid main header; regenerating
backup header from main header.

Warning! Error 27 reading partition table for CRC check!
Warning! One or more CRCs don't match. You should repair the disk!

Partition table scan:
MBR: protective
BSD: not present
APM: not present
GPT: damaged

****************************************************************************
Caution: Found protective or hybrid MBR and corrupt GPT. Using GPT, but disk
verification and recovery are STRONGLY recommended.
****************************************************************************

Command (? for help): o
This option deletes all partitions and creates a new protective MBR.
Proceed? (Y/N): Y

Command (? for help): w

Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING
PARTITIONS!!

Do you want to proceed? (Y/N): Y
OK; writing new GUID partition table (GPT) to /dev/sdd.
The operation has completed successfully.


Повторно вызываю gdisk:

# gdisk /dev/sdd
GPT fdisk (gdisk) version 1.0.1

Warning! Read error 27; strange behavior now likely!
Caution: invalid backup GPT header, but valid main header; regenerating
backup header from main header.

Warning! Error 27 reading partition table for CRC check!
Warning! One or more CRCs don't match. You should repair the disk!

Partition table scan:
MBR: protective
BSD: not present
APM: not present
GPT: damaged

****************************************************************************
Caution: Found protective or hybrid MBR and corrupt GPT. Using GPT, but disk
verification and recovery are STRONGLY recommended.
****************************************************************************
................................................................................................

Т.е. повторяется прежняя ошибка в резервных копиях GPT.
Подскажите, как избавиться от этой ситуации и записать правильный GPT? Если создаю на таком диске ext4 файловую систему, то диск не монтируется.
Заранее признателен

Это не софтварный рейд?

Апаратный - адаптек ASR8805
4 диска по 6 Тб