Re: Serial console - how to reboot?

Hello,

AMI MegaRAID also had this problem on Linux, so I suspect it's a design 
fault in the RAID controller or firmware / BIOS.

They even mentioned in a previous firmware README that you should 
increase the timeout in the Linux SCSI driver to avoid this problem :-)


Mvh,
Frode

On Jun 12, 2004, at 12:08, Eirik Oeverby wrote:

> Hi all,
>
> I have recently been getting the following messages on my console:
> swap_pager: indefinite wait buffer: device: #amrd/0x20001, blkno: 
> 1072, size: 4096
> swap_pager: indefinite wait buffer: device: #amrd/0x20001, blkno: 832, 
> size: 4096
> swap_pager: indefinite wait buffer: device: #amrd/0x20001, blkno: 512, 
> size: 4096
> swap_pager: indefinite wait buffer: device: #amrd/0x20001, blkno: 576, 
> size: 4096
> swap_pager: indefinite wait buffer: device: #amrd/0x20001, blkno: 584, 
> size: 4096
>
> I am aware that this usually indicates a bad drive or something, but 
> given that it's a RAID volume hanging on an AMI MegaRAID controller 
> (SCSI), and none of the drives in the array are degraded, that can't 
> really be the case. I'm suspecting a bug in the driver (though freebsd 
> 4.10 should be stable, right?) or a faulty cable or such.
>
> What would mitigate the problem for now though would be to have a way 
> to reboot the system. I'm about 1000 miles away from the box, so I 
> can't go there, but I do have access via serial console (which is 
> where I'm getting these messages). I'm using minicom, but could use 
> any other serial comms package on FreeBSD. Not sure if C-A-D would 
> help, but as I don't know how to push that keycombo through minicom 
> anyway, I'm kinda stuck.
> The box is replying to pings but no other services are available. The 
> console is also 'dead', i.e. i can't get any command prompts or login 
> prompt. Only these messages who keep showing up, about 1 per second.
>
> Entering the kernel debugger might help, though I'm actually not sure 
> if it's compiled into the running kernel. But if it is, how can I get 
> to it via serial?
>
> Anyone?
>
> Thanks,
> /Eirik
>
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