Re: MegaSAS Hang on Smart Query

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Keith Baker wrote:
> I've been having a hang with 2.6.16.22 and the megasas driver.  I'm pretty
> sure it has to do with a smartctl -a <logical drive>.  The SCSI layer gets
> all sorts of in a twist.

Keith,
Could you add '-r ioctl,3' to the smartctl command line
to get a full debug output. Then we can see which SCSI
commands the megasas driver or hardware doesn't like.

> megasas: waiting for 2 commands to complete
> - repeats a bunch of times then -
> sd 0:2:0:0: rejecting I/O to offline device
> 
> Given a bit of wisdom in a driver distributed by dell which mentioned the
> controller not responding to a cache inqury...  isn't the correct thing to
> do respond with some sort of unsupported response?  not just ignore the
> query?

Correct. I'm sure the vendor knows what should be done.

> I've hunted around for patches around this problem but haven't found any,
> of course "don't use smart against a logical drive" works, but I'm not the
> only one using these boxes and it does cause the system to go down.

Doug Gilbert


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