Ill try creating the partitions similar and see if that resolves the issue:
Sep 4 16:55:46 Server unassigned.devices: Adding disk '/dev/sdh2'...
Sep 4 16:55:46 Server unassigned.devices: Adding disk '/dev/sdg1'...
Sep 4 16:55:46 Server unassigned.devices: Adding disk '/dev/sdh1'...
Sep 4 16:55:46 Server unassigned.devices: Adding disk '/dev/sdg2'...
Sep 4 16:55:46 Server unassigned.devices: No filesystem detected on '/dev/sdg1'.
Sep 4 16:55:46 Server unassigned.devices: Mount drive command: /sbin/mount -t 'ext4' -o rw,auto,noatime,nodiratime,async,nodev,nosuid '/dev/sdh2' '/mnt/disks/Part_1'
Sep 4 16:55:46 Server unassigned.devices: No filesystem detected on '/dev/sdh1'.
Sep 4 16:55:46 Server unassigned.devices: Mount drive command: /sbin/mount -t 'ext4' -o rw,auto,noatime,nodiratime,async,nodev,nosuid '/dev/sdg2' '/mnt/disks/Part_2'
Sep 4 16:55:46 Server unassigned.devices: Partition 'H_W_RAID 5-part1' cannot be mounted.
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Sep 4 16:55:46 Server kernel: EXT4-fs (sdg2): mounted filesystem with ordered data mode. Opts: (null)
Sep 4 16:55:46 Server unassigned.devices: Successfully mounted '/dev/sdg2' on '/mnt/disks/Part_2'.
Sep 4 16:55:46 Server unassigned.devices: Adding SMB share 'Part_2'.
Sep 4 16:55:46 Server kernel: EXT4-fs (sdh2): mounted filesystem with ordered data mode. Opts: (null)
Sep 4 16:55:46 Server unassigned.devices: Successfully mounted '/dev/sdh2' on '/mnt/disks/Part_1'.
Sep 4 16:55:46 Server unassigned.devices: Adding SMB share 'Part_1'.
Sep 4 16:57:08 Server emhttpd: spinning down /dev/sdc
Sep 4 17:00:07 Server crond[1678]: exit status 1 from user root /usr/local/sbin/mover &> /dev/null
Sep 4 17:07:51 Server webGUI: Successful login user root from 192.168.1.240
Sep 4 17:07:51 Server emhttpd: H_W_RAID_5_0123456789ABCDEF-0:1 (sdh) 512 23441768448
Sep 4 17:07:51 Server emhttpd: H_W_RAID_5_0123456789ABCDEF-0:0 (sdg) 512 23441768448
Sep 4 17:07:52 Server emhttpd: read SMART /dev/sdh
Sep 4 17:07:52 Server emhttpd: read SMART /dev/sdg
Sep 4 17:08:06 Server emhttpd: read SMART /dev/sdd
Sep 4 17:08:06 Server emhttpd: read SMART /dev/sdb