processor over use

Is HDD connected to SATA port or USB? What syslog says?

This sounds something like my problem. It sounds like the connection with the USB drive is lost.

Does the disk show up in the storage -> file system when this happens or disappears?

Does file transfer via SMB work or does the same thing happen? It looks like the HDD usb disconnects.

What Chipset doea USB enclosure has? Jmicron? ASM?

Type lsusb in terminal and copy info here.

Quote from nayb87

Code

Bus 004 Device 002: ID 8087:8000 Intel Corp. Integrated Rate Matching Hub
Bus 004 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:8008 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 005: ID 152d:0583 JMicron Technology Corp. / JMicron USA Technology Corp. JMS583Gen 2 to PCIe Gen3x2 Bridge
Bus 003 Device 004: ID 05e3:0749 Genesys Logic, Inc. SD Card Reader and Writer
Bus 003 Device 003: ID 1058:2620 Western Digital Technologies, Inc. Elements 2620
Bus 003 Device 002: ID 2109:0813 VIA Labs, Inc. VL813 Hub
Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 002 Device 007: ID 1a86:7523 QinHeng Electronics CH340 serial converter
Bus 002 Device 002: ID 2109:2813 VIA Labs, Inc. VL813 Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

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I see a Jmicron hub and a VL813 hub in the list. Is more than one disk connected via usb?

Are you using Rpi or PC as server?

To be short and clear.

I have a suspicion that UAS inside linux is crashing the docking disk. - at least that's how it is with me and I've been struggling for days to discover the problem.

I blacklisted the UAS yesterday and have been testing all day so far everything is working fine! Maybe you have the same problem.

I read on some forum that USB 3.0 in Linux is total chaos and that external drives and hubs often have problems.

If you use an RPi, read this:

STICKY: If you have a Raspberry Pi 4 and are getting bad speeds transferring data to/from USB3.0 SSDs, read this - Raspberry Pi Forums

If you use a PC, then read these two things: - read this to understand what the problem is: https://forums.raspberrypi.com/viewtopic.php?t=245931

-implement blacklisting UAS in this way (because it differs from RPi):

Disable UAS on for PC

Yesterday I did exactly that and everything is magically stable!

[69968.727478] I/O error, dev sdb, sector 6587100624 
op 0x0:(READ) flags 0x80700 phys_seg 2 prio class 2

[70204.067625] INFO: task usb-storage:183 blocked for more than 120 seconds.

I think it is directly related to external storage. Disk or enclosure is failing or it has bad chipset/driver software for linux (you can test it on windows and it would work).

Run SMART test to see if disk fails or have bad sectors.

I'm having big problems with usb external HDD too.. Now I'm in search for ASM chipset enclosure to try.

But saw somewhere that external enclosures can randomly fail.

Can't help. All I can say is that usb 3.0 external storage on Linux is trash.

You can hear people saying that Debian an Linux are most robust systems..well yes but same time no.

Quote from nayb87

Ok thanks for your answer.

I see SMART and I view 1 of my hdd have a bad sector.

Is it possible to repair this?

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I would never trust a disk with a bad sector. Change the disk as soon as possible while you can still save data from it.