JorgeB

Yes!!! That explains the missing partition.

Please post diags after a balance attempt. P.S. "No balance" is normal after the balance ends/stops.

I've several, but not on x1 slots, it might work if the slot is open ended.

Unlikely the BIOS would help, it should boot fine without it in legacy or UEFI mode, most likely this, or a compatibility issue with that board.

Only option now is using a file recovery util, like UFS explorer.

Also don't forget that you'll then need to always run reiserfsck on the partition, not the disk, always /dev/sdX1 never /dev/sdX

See if a different flash drive boots.

It doesn't, unless something goes wrong.

This is a hardware issue, if it's a Proliant server see here:

You can use this: sgdisk -o -a 8 -n 1:32K:0 /dev/sdX

There's a problem with the cache filesystem, you should backup and re-format, then restore the data and also best recreate the docker image.

If it didn't download them after 2 minutes it won't, get them on the console by typing "diagnostics"

Without the diags we can only guess, possibly a problem with the cache filesystem.

Note that after correcting that you'll need to run two checks, 1st one might still find errors, 2nd one shouldn't, if it still does run memtest.

First thing to do is to not overclock the RAM, since it's a known issue with some Ryzen servers, respect max officially supported speeds for your config.

With array started please.

Time to ask for help would be before doing this, still not clear to me what's the current array status, please post the diagnostics: Tools -> Diagnostics

Docker image is corrupt, recreate it.

Could be, but not because of the temp, 36C is still cool.

That's weird, create a new partition on the USB disk starting on sector 64, then rebuild the reiser superblock, then run --rebuild-tree.

Nothing obvious, you can run the diskspeed docker to see if all disks are performing nominally.

Yep, cancel and try without a different disk.

Most likely, btrfs will quickly corrupt wit bad RAM.

Disk dropped offline, so there's no SMART, check connections and post new SMART report.

Oct 20 01:15:53 Tower kernel: md: import disk0: (sdh) ST16000NM001G-2KK103_ZL26X1ZV size: 15625879500 Oct 20 01:15:53 Tower kernel: md: import disk1: (sdf) WDC_WD80EDAZ-11TA3A0_VGH3P1DG size: 7814026532 Oct 20 01:15:53 Tower kernel: md: import disk2: (sdi) WDC_WD80EFAX-68LHPN0_7SGD4GEC size: 7814026532 Oct 20 01:15:53 Tower kernel: md: import disk3: (sdk) WDC_WD80EMAZ-00WJTA0_7SH1J64C size: 7814026532 Oct 20 01:15:53 Tower kernel: md: import disk4: (sdj) WDC_WD100EMAZ-00WJTA0_1DGTJHWZ size: 9766436812 Oct 20 01:15:53 Tower kernel: md: import disk5: (sdg) WDC_WD80EZAZ-11TDBA0_7HJPE9VF size: 7814026532 Oct 20 01:15:53 Tower kernel: md: import disk6: (sdb) WDC_WD100EMAZ-00WJTA0_1EG4NS7Z size: 9766436812 Oct 20 01:15:53 Tower kernel: md: import disk7: (sdd) WDC_WD80EDAZ-11TA3A0_VDJUSVAK size: 7814026532 Oct 20 01:15:53 Tower kernel: md: import disk8: (sde) WDC_WD100EMAZ-00WJTA0_JEKU2VWZ size: 9766436812