softdep_move_dependencies panic

[Leubner, Achim]

Thanks for the information. But could you please explain this workaround in detail? If I understand you correctly I should not remove the device with device_delete_child(). But how should I indicate that it has failed? And how can I complete the i/o with good status although the i/o did not work?

Thanks,
Achim


-----Original Message-----
From: Scott Long [mailto:scottl at samsco.org] 
Sent: Wednesday, May 06, 2009 6:56 PM
To: Leubner, Achim
Cc: Ed Maste; current at freebsd.org; Sridaran, Gana
Subject: Re: softdep_move_dependencies panic

No, there is no fix for this.  FreeBSD doesn't handle this case very 
well.  What I would suggest doing is keeping the logical representation
of the device around, but indicate that it has failed.  Then complete
all i/o with good status.  This is something that is being worked on,
but I have no information on when it might be fixed.

Scott



Leubner, Achim wrote:
> Hi Ed, Hi Scott,
> 
>  
> 
> We run into a problem if a RAID array goes into an "error" state and is 
> marked "offline". The new aac driver removes the device in this case 
> with device_delete_child() and all commands to that device will be 
> answered using biodone() with flag BIO_ERROR and error EINVAL. But this 
> causes a "softdep_move_dependencies: need merge code" panic in the 
> filesystem. Is there any possibility to avoid this panic? We see it 
> under FreeBSD 7.1 too.
> 
> Any help is greatly appreciated.
> 
>  
> 
> Thanks & Regards,
> 
> Achim
> 
>  
> 
> ===========================
> 
> Achim Leubner
> 
> Software Engineer / RAID drivers
> 
> ICP vortex GmbH / Adaptec Inc.
> 
> Phone: +49-351-8718291
> 
>  
>