Re: Kernel Dump when accessing second drive

[YONETANI Tomokazu <qhwt+dfly@xxxxxxxxxx>]

On Mon, May 17, 2010 at 12:13:55AM -0700, Dylan Reinhold wrote:
> May 15 15:53:37 backup_a kernel: ad6: TIMEOUT - READ_DMA retrying (1
> retry left) LBA=49814018
> May 15 15:53:38 backup_a kernel: ad6: WARNING - READ_DMA soft error
> (ECC corrected) LBA=49871650
> May 15 15:53:38 backup_a kernel: ad6: WARNING - READ_DMA UDMA ICRC
> error (retrying request) LBA=49871682
> May 15 15:53:38 backup_a kernel: ad6: timeout waiting to issue command

These messages usually indicate problems on the harddisk.  You may also
want to check the cable or the power supply.

> May 15 15:55:42 backup_a syslogd: kernel boot file is /boot/kernel
> May 15 15:55:42 backup_a kernel: ad6: FAILURE - device detached
> May 15 15:55:42 backup_a kernel: subdisk6: detached
> May 15 15:55:42 backup_a kernel: ad6: detached
> 
> Does this mean the controller is reporting the disk is gone?

When the driver detects a timeout on a device, it attempts to
reinitialize the children, and if that fails, the driver gives up
and tries to detach it --- at least that's how I read the code.

Cheers.