So, I've used 2 of my cache devices to be selected as boot + data partition. They where at "cache" pool, so set all devices from "cache" to unassigned (no device) and started the wizard. Choose 16GB, and it ask for a name for the data partition that I set "cacheta". After restart the boot partition works great, but I could not start the array as "cache - too many wrong or missing devices ".

Tried to click on "cache", ERASE POOL, proceed, nothing happen, logs shows this red message:

May 25 01:00:39 LeitoaNas kernel: read_file: error 2 opening /boot/config/super.dat

Full log after pressing the ERASE POOL

May 25 01:01:59 LeitoaNas emhttpd: update_pool_cfg: 30 cache 0

May 25 01:01:59 LeitoaNas kernel: md: unRAID driver removed

May 25 01:01:59 LeitoaNas emhttpd: shcmd (282): /sbin/modprobe md-mod super=/boot/config/super.dat

May 25 01:01:59 LeitoaNas kernel: md: unRAID driver 2.9.40 installed

May 25 01:01:59 LeitoaNas kernel: read_file: error 2 opening /boot/config/super.dat

May 25 01:01:59 LeitoaNas kernel: md: could not read superblock from /boot/config/super.dat

May 25 01:01:59 LeitoaNas kernel: md: initializing superblock

May 25 01:01:59 LeitoaNas kernel: mdcmd (1): import 0 sda 64 3907018532 0 WDC_WD40EFPX-68C6CN0_WD-WX22DC391VED

May 25 01:01:59 LeitoaNas kernel: md: import disk0: (sda) WDC_WD40EFPX-68C6CN0_WD-WX22DC391VED size: 3907018532

May 25 01:01:59 LeitoaNas kernel: md: disk0 new disk

May 25 01:01:59 LeitoaNas kernel: mdcmd (2): import 29

May 25 01:01:59 LeitoaNas kernel: mdcmd (3): import 1 sdc 64 1953514552 0 WDC_WD20EFPX-68C4TN0_WD-WX52DA3ACDT7

May 25 01:01:59 LeitoaNas kernel: md: import disk1: (sdc) WDC_WD20EFPX-68C4TN0_WD-WX52DA3ACDT7 size: 1953514552

May 25 01:01:59 LeitoaNas kernel: md: disk1 new disk

May 25 01:01:59 LeitoaNas kernel: mdcmd (4): import 2

May 25 01:01:59 LeitoaNas kernel: mdcmd (5): import 3

May 25 01:01:59 LeitoaNas kernel: mdcmd (6): import 4

May 25 01:01:59 LeitoaNas kernel: mdcmd (7): import 5

May 25 01:01:59 LeitoaNas kernel: mdcmd (8): import 6

May 25 01:01:59 LeitoaNas kernel: mdcmd (9): import 7

May 25 01:01:59 LeitoaNas kernel: mdcmd (10): import 8

May 25 01:01:59 LeitoaNas kernel: mdcmd (11): import 9

May 25 01:01:59 LeitoaNas kernel: mdcmd (12): import 10

May 25 01:01:59 LeitoaNas kernel: mdcmd (13): import 11

May 25 01:01:59 LeitoaNas kernel: mdcmd (14): import 12

May 25 01:01:59 LeitoaNas kernel: mdcmd (15): import 13

May 25 01:01:59 LeitoaNas kernel: mdcmd (16): import 14

May 25 01:01:59 LeitoaNas kernel: mdcmd (17): import 15

May 25 01:01:59 LeitoaNas kernel: mdcmd (18): import 16

May 25 01:01:59 LeitoaNas kernel: mdcmd (19): import 17

May 25 01:01:59 LeitoaNas kernel: mdcmd (20): import 18

May 25 01:01:59 LeitoaNas kernel: mdcmd (21): import 19

May 25 01:01:59 LeitoaNas kernel: mdcmd (22): import 20

May 25 01:01:59 LeitoaNas kernel: mdcmd (23): import 21

May 25 01:01:59 LeitoaNas kernel: mdcmd (24): import 22

May 25 01:01:59 LeitoaNas kernel: mdcmd (25): import 23

May 25 01:01:59 LeitoaNas kernel: mdcmd (26): import 24

May 25 01:01:59 LeitoaNas kernel: mdcmd (27): import 25

May 25 01:01:59 LeitoaNas kernel: mdcmd (28): import 26

May 25 01:01:59 LeitoaNas kernel: mdcmd (29): import 27

May 25 01:01:59 LeitoaNas kernel: mdcmd (30): import 28

May 25 01:01:59 LeitoaNas emhttpd: import 30 pool device: no device

May 25 01:01:59 LeitoaNas emhttpd: import 31 pool device: no device

May 25 01:01:59 LeitoaNas emhttpd: import 32 pool device: (nvme0n1) Samsung_SSD_970_EVO_Plus_1TB_S59ANM0W542695L

May 25 01:01:59 LeitoaNas emhttpd: import 33 pool device: (nvme1n1) Samsung_SSD_970_EVO_Plus_1TB_S4EWNJ0N421679T

May 25 01:01:59 LeitoaNas emhttpd: import 34 pool device: (sdb) Samsung_SSD_850_EVO_500GB_S2RBNX0J120136A

May 25 01:01:59 LeitoaNas emhttpd: flash: zfs assign devices

May 25 01:01:59 LeitoaNas emhttpd: import boot device: 35 (nvme0n1p3)

May 25 01:01:59 LeitoaNas emhttpd: import boot device: 36 (nvme1n1p3)

May 25 01:01:59 LeitoaNas emhttpd: update_pool_cfg: 30 cache 0

May 25 01:01:59 LeitoaNas emhttpd: update_pool_cfg: 32 cacheta 0

May 25 01:01:59 LeitoaNas emhttpd: update_pool_cfg: 34 tempcache 0

So, deleting the pool doesn't work, I can't start the pool also.

Tried to unassign from "cacheta" to the old one also doesn't work as it looks that needs the previous one.

Tried to delete /boot/config/pools/cache.cfg but it got recreated as soon as I ask to delete again (as it appears again at the Main).

Tried to recreate a New config and selected "ALL" for "Preserve current assignments". The problematic "cache" partition was recreated.

Tried to again to recreate a New Config, but now it says: "Array has been Reset (please configure)"

So I'm in a catch-22 situation. I can't reconfigure as it asks for this reference of the old (non partitioned device). Can't create a New Config. Delete the new pool doesn't work. Set pool size to 0 doesn't work (it only shows 2).

I'm adding a screenshot, please let me know if you have any suggestion as my array can't be started.

Type

mv /boot/config/pools/cache.cfg /boot/config/pools/cache.bak

Then reboot

That solved my problem!!! Thank you very much!

Just wanted to add that I had the same issue as vessosa. Whilst my cache name was different (in my instance it was nvme500g - which makes sense as that was what the pool was previously called) the above syntax worked for me by renaming the file and rebooting so it regenerated it.