[Info-vax] Processes hang on USB-access

[Craig A. Berry]

On 2/17/22 3:15 AM, Joukj wrote:
> Hi all,
> 
> I have an 2 TB USB-disk attached to a DPWS500 running OpenVMS Alpha 
> V8.4-2L1. After a couple of hours to couple of days the process 
> reading/writing to the disk seems to hang on the disk access. When some 
> other process tries to access this disk in this state, it also hangs. A 
> normal reboot of the machine is not possible anymore since also the 
> dismount of the disk hangs. I have to reset the machine.
> 
> No errors are logged for the device.

Logged where?

> What could be the problem and how can I avoid processes hanging on 
> access to this disk?
> 
> I already changed the USB-disk for a brand new one and I changed the 
> machine to which it is connected. I think I also tried a XP1000.

Have you read the section in the system management utilities reference
manual (volume 2) on managing USB devices?  Have you done any basic
investigation of what the system thinks about the device, with, say UCM
SHOW DEVICE or UCM SHOW EVENTS?  Or just looked at
SYS$SYSTEM:USB$UCM_DEVICES.DAT to see how the device is configured?