Hi there,
First post here 
I’m using RPi 4B 2Gb with Quad SATA Hat with 4 HDD (2x1TB & 2x 750GB) and I was trying to use the hardware RAID capabilities provided by the JMS 561 controller, as already described there:
Setting up HARDWARE RAID with QUAD SATA-HAT (jms561 controller)
After having created by RAID 0 array and “played” with it, I wanted to remove it in order to use mdadm again.
I used the following command to delete my RAID array:
JMS56X>dr c1 r0
And got that kind of output:
RAID Port = 0
RAID level = 0
But my array is still present (sdc here):
flo@raspberrypi:~ $ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 931.5G 0 disk
sdb 8:16 0 931.5G 0 disk
sdc 8:32 0 1.4T 0 disk
mmcblk0 179:0 0 29G 0 disk
├─mmcblk0p1 179:1 0 256M 0 part /boot
└─mmcblk0p2 179:2 0 28.7G 0 part /
flo@raspberrypi:~ $
And when I’m trying to get the raid status:
JMS56X>sr c1
-- Raid[0]
------ ModelName = H/W RAID0
------ SerialNumber = 2TVVSVZELAOP9BMRVKRY
------ Capacity = 1397 GB
------ RaidStatus = Broken
------ RaidLevel = RAID 0
------ RaidMbrCount = 2
------ RebuildPriority = 3
------ RaidMember[0]
--------- Ready = 1
--------- LBA48Support = 1
--------- SataPage = 0
--------- SataPort = 0
--------- SataBase = 0
--------- SataSize = 698 GB
JMS56X>
The RAID status is BROKEN.
Both controllers FW were up to date, and I tried to flash them again but changed nothing.
I also tryed with the Windows JMS Raid Manager and I get an error when trying to remove my RAID.
And last but not least, this RAID array is completely unusable:
flo@raspberrypi:~ $ sudo fdisk /dev/sdc
Welcome to fdisk (util-linux 2.36.1).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
fdisk: cannot open /dev/sdc: Input/output error
flo@raspberrypi:~ $
Anyone have an idea to “reset” completely the controller?
Thanks in advance