Storage Pool not deleteable

[mandrael]

Hi,
I have 3 Seagate Ironwolf 8TB in my T6-423. Cam back to TOS 5.1 after testing unRAID. During the reinitialization TOS didn't ask me details and just started with syncing 2 of the 3 drives. I tried to delete Volume and Pool. The Volume was deletable, but after showing "deleting" and a blank page, the storage pool showed again and counted up syncing. Not it shows RAID degraded.
I want a clean start with TRAID (3 HDDs). How can I do that? No data involved, I just want a regular TRAID.
Best, Michael

[TMzethar]

Although I don't know what the specific reason is, you should be able to reset your hard drives by clearing the soft RAID. Please refer to the following steps (please note that this will lose all data on the hard drive)
1. Boot T6-423 as an empty device (no HDD, no SSD)
2. Search and open the U disk init system web page
3. Insert the three disks and wait for 1 minute
4. Log in to SSH, account: root, password: admin
5. Enter the following command to confirm your disks and partitions:()

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ls /dev/sd*

6. Enter the following command to clear disks soft RAID at sd*4:(Assuming sdb,sdc,sdd is your three disks, and only 4 partitions each one)

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mdadm --zero-superblock /dev/sdb4
mdadm --zero-superblock /dev/sdc4
mdadm --zero-superblock /dev/sdd4

If there is 5 partition, you need to clear the soft RAID at sd*5 too.
7.follow the prompt at init USB system web page to complete the initialization

[mandrael]

Thanks,
I started the device without hdds and waited, then went into ssh and plugged all hdds in:

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[root@TNAS ~]# ls /dev/sd* -l
brw-rw----    1 root     disk        8,   0 Apr 18 04:11 /dev/sda
brw-rw----    1 root     disk        8,   1 Apr 18 04:11 /dev/sda1
brw-rw----    1 root     disk        8,  16 Apr 18 04:27 /dev/sdb
brw-rw----    1 root     disk        8,  17 Apr 18 04:27 /dev/sdb1
brw-rw----    1 root     disk        8,  18 Apr 18 04:27 /dev/sdb2
brw-rw----    1 root     disk        8,  19 Apr 18 04:27 /dev/sdb3
brw-rw----    1 root     disk        8,  20 Apr 18 04:27 /dev/sdb4
brw-rw----    1 root     disk        8,  32 Apr 18 04:27 /dev/sdc
brw-rw----    1 root     disk        8,  33 Apr 18 04:27 /dev/sdc1
brw-rw----    1 root     disk        8,  34 Apr 18 04:27 /dev/sdc2
brw-rw----    1 root     disk        8,  35 Apr 18 04:27 /dev/sdc3
brw-rw----    1 root     disk        8,  36 Apr 18 04:27 /dev/sdc4
brw-rw----    1 root     disk        8,  48 Apr 18 04:28 /dev/sdd
brw-rw----    1 root     disk        8,  49 Apr 18 04:28 /dev/sdd1
brw-rw----    1 root     disk        8,  50 Apr 18 04:28 /dev/sdd2
brw-rw----    1 root     disk        8,  51 Apr 18 04:28 /dev/sdd3
brw-rw----    1 root     disk        8,  52 Apr 18 04:28 /dev/sdd4

afterwards:

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[root@TNAS ~]# mdadm --zero-superblock /dev/sdb4
mdadm: Unrecognised md component device - /dev/sdb4
[root@TNAS ~]# mdadm --zero-superblock /dev/sdc4
[root@TNAS ~]# mdadm --zero-superblock /dev/sdd4

I also entered this command:

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[root@TNAS ~]# cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] [multipath] [faulty] 
unused devices: <none>

[root@TNAS ~]# ls /dev/md*
ls: /dev/md*: No such file or directory

Are all HDDs reset now and can I restart the Terramaster initialization? Is there a general way to start over with fresh drives? They have already partitions.

Best, Michael

[mandrael]

It seems it worked
See screenshot in attachment.
Are there disadvantages of TRAID compared to RAID 5? How about speed. Is the difference between the two relevant?
(With three 8TB drives available data space and parity are equal: 16 TB Data 8TB Parity)
Best, Michael

[TMzethar]

No obvious disadvantages compared to RAID5 have been found yet.
They are all 1 disk or partition as redundancy, but the mechanism of TRAID is more flexible and complex.
If you want to know more, you can refer to here:
viewtopic.php?f=87&t=3191
viewtopic.php?f=79&t=1723