nbd errors and /dev/nbd* files.

[Marcus Lively]

Marcus Lively wrote:

> Hi,
> Hope someone can help me here, I have noticed the following in my log 
> files and have done some research but seem to be drawing blanks. the 
> messages are as follows:
>
> kernel: end_request: I/O error, dev nbd104, sector 4294965120
> kernel: nbd104: Request when not-ready
> kernel: end_request: I/O error, dev nbd104, sector 0
> kernel: nbd105: Request when not-ready
> kernel: end_request: I/O error, dev nbd105, sector 4294965120
> kernel: nbd105: Request when not-ready
> ...
> also
> kernel: Buffer I/O error on device nbd16, logical block 2
> kernel: Buffer I/O error on device nbd16, logical block 3
> kernel: Buffer I/O error on device nbd16, logical block 4
> kernel: Buffer I/O error on device nbd16, logical block 5
> kernel: Buffer I/O error on device nbd16, logical block 6
> kernel: Buffer I/O error on device nbd16, logical block 7
> ...                                                         There are 
> a number of nbdnnn files in the /dev directory yet I have not 
> configured any nbd filesystems, I have checked lvm and there doesn't 
> seem to be any logical volumes configured. My question is why are 
> these messages appearing in the logs, and how come I seem to have so 
> many nbd device files, could I just remove them from /dev.
>
> Thanks  Marcus.
>
OK, some more info

netfs is set to run at startup
boot log shows - netfs: Mounting other filesystems:  failed
no remote file systems are listed in /etc/fstab
nfsd process is not running
/etc/exports is empty

I do not know if the two are related, and since I do not use nfs perhaps 
I should turn nfs off. I am still confused why these nbd device files 
exist though and would like to remove them. Any advice appreciated.

Thanks Marcus.