**Update**
I have discovered that the RAID array is intact and the helios4 seems fine. It was not an OMV issue.
The power brick appears to be the issue as it is only outputting 8v instead of 12v, and drives are recognized when powered externally.
Hello,
I recently had my Helios4 NAS crash and had to reinstall Armbian and OMV. My pre-existing RAID array does not show up and after reading through the forums I discovered that all four sata links are down.
root@Tartarus:~# cat /proc/mdstat
Personalities : [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
unused devices: <none>
root@Tartarus:~# blkid
/dev/mmcblk0p1: UUID="ae133275-b674-4f03-bed3-1f9bcdbb6508" TYPE="ext4" PARTUUID="caa0df2d-01"
/dev/zram0: LABEL="log2ram" UUID="ee603709-5a6c-4229-9b26-09621f57b696" TYPE="ext4"
/dev/mmcblk0: PTUUID="caa0df2d" PTTYPE="dos"
/dev/zram1: UUID="40d0f076-3afb-4efc-b0a0-b9c574773f9e" TYPE="swap"
root@Tartarus:~# fdisk -l | grep "Disk "
Disk /dev/mmcblk0: 29.8 GiB, 32010928128 bytes, 62521344 sectors
Disk identifier: 0xcaa0df2d
Disk /dev/zram0: 50 MiB, 52428800 bytes, 12800 sectors
Disk /dev/zram1: 1008 MiB, 1056894976 bytes, 258031 sectors
root@Tartarus:~# cat /etc/mdadm/mdadm.conf
# mdadm.conf
#
# Please refer to mdadm.conf(5) for information about this file.
#
# by default, scan all partitions (/proc/partitions) for MD superblocks.
# alternatively, specify devices to scan, using wildcards if desired.
# Note, if no DEVICE line is present, then "DEVICE partitions" is assumed.
# To avoid the auto-assembly of RAID devices a pattern that CAN'T match is
# used if no RAID devices are configured.
DEVICE partitions
# auto-create devices with Debian standard permissions
CREATE owner=root group=disk mode=0660 auto=yes
# automatically tag new arrays as belonging to the local system
HOMEHOST <system>
# definitions of existing MD arrays
ARRAY <ignore> devices=*
# Trigger Fault Led script when an event is detected
PROGRAM /usr/sbin/mdadm-fault-led.sh
[ 287.775306] ata1: SATA link down (SStatus 0 SControl 300)
[ 288.087304] ata4: SATA link down (SStatus 0 SControl 300)
[ 288.399307] ata2: SATA link down (SStatus 0 SControl 300)
[ 288.711312] ata3: SATA link down (SStatus 0 SControl 300)I only posted the end of dmesg as the full output was over the message size limit
I tried using omv-extras as suggested here: [SOLVED]2 of the hard disks are not dectected, but that didn't help.
I re-seated all of the connectors and ran quick SMART tests on all four WD RED 8TB drives, which they passed.
OMV 4.1.32-1 (Arrakis)
Debian Stretch with Armbian Linux 4.19.63-mvebu
Thanks