Hi,

I have a new install of Ubuntu 14.04.3 (kernel 3.19.0-47-generic). In this PC, I have a PCIe USB3 expansion card. Plugged into the card are two external USB3 drives. One is a Seagate Backup Plus Desktop, the other is a Seagate GoFlex Desk. Both are 3TB drives. These drives hold the backups from all the computers in the house, as well as videos and music. Almost 2TB of stuff. The intention is that one of the drives is a backup of the other.

The Backup Plus was just formatted as ext4, and I am trying to copy all the stuff from the GoFlex to the Backup Plus. Writing to the Backup Plus causes a hard crash. Not immediately, but usually in less than 10 minutes. I can read the entire contents of the GoFlex without a problem. When the crash happens, the screen freezes. I have to cycle power to reboot. I do not see anything interesting in the logs after the crash.

I can read the contents of the Backup Plus, either as a raw device or at the file system, without triggering the crash. It seems just writing triggers the crash.

I found some threads reporting that the uas module sometimes causes problems, so I blacklisted it. With it blacklisted, the Backup Plus does not mount.

The HW combo works fine under Win7, which was previously loaded on this PC.

Looking for recommendations.

Thanks,
Jim

The latest kernel you can get would probably be a good idea.
Have a read of this interesting thread over on Arch, where the maintainer had to request input so s?he could update the driver for various (misbehaving ?) hardware.

I don't have any experience with uas, just passing along what I found.

syg00, I will try posting to the kernel mailing list.

BTW, further testing seems to indicate the problem occurs when simultaneously reading from one of the USB drives and writing to the other. I have not been successful in forcing the error while writing to the Backup Plus drive when the other drive is not involved.

Thanks