Re: libata timeouts when stressing a Samsung HDD

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On Mon, 16 Feb 2009 12:12:56 +0900
Tejun Heo <tj@xxxxxxxxxx> wrote:


> > 
> > Mmm.. I think it is the SD_TIMEOUT value, defined in drivers/scsi/sd.h
> > which currently uses (30 * HZ) as the timeout for most things,
> > including for cache flushes.
> > 
> > Try changing it to (180 * HZ) just for fun.
> 
> Yeap, SD_TIMEOUT should be it.  But I've never personally seen disk
> flushing taking as long as 30 seconds.  Does it really happen?  It's
> not like the drive would be doing random seeking.  One full stroke
> across the platter should be it.  Even with the rotational delay,
> going over 30 seconds doesn't seem very likely.

I just noticed that the other drive, a Western Digital, was using 1.5Gbps
instead of 3.0. So I forced the Samsung to the slower speed and now I
can't make the timeout happen anymore.
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