Re: [eSATA] 2.6.28.7: IO errors

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On Mon, 30 Mar 2009, Tejun Heo wrote:

> Hello,
> 
> Guennadi Liakhovetski wrote:
> > Hi Matthew,
> > 
> > On Fri, 27 Mar 2009, Matthew Wilcox wrote:
> > 
> >> On Sat, Mar 28, 2009 at 12:18:38AM +0100, Guennadi Liakhovetski wrote:
> >>> I'm using an external eSATA / USB / Firewire 2x1T RAID from WD in RAID1 
> >> Looks like your problems are solved by
> >> 9062712fa9ed13b531dfc2228086650b8bd6a255
> > 
> > (added Tejun as the patch author and owner of similar hardware)
> 
> Thanks for forwarding.

Thanks for replying:-)

> > AFAIU, that patch improves or fixes error handling on those drives, and 
> > the symptom, that Tejun was observing, was that the drive was hanging and 
> > required a power cycle.
> > 
> > In my case the drive didn't need a power cycle, and error handling did 
> > work, AFAICS, but even just having that error seems not healthy for the 
> > data, which is confirmed by ext4 errors. Am I right?
> 
> No, your drive checked out after the last error even after the link
> speed had been lowered to 1.5Gbps, so the EH did everything it could
> but no candy.  The drive still checked out.
> 
> > Error handling is great, but I think what I want is to avoid such errors 
> > altogether. So, my question was - can those errors be indeed caused by the 
> > unstable eSATA connector in the drive? Tejun, you have similar drives, do 
> > yours also have such a problem? How are you solving it?
> 
> I don't use the drives extensively but shorter cables seem to solve a
> lot of the issues during testing.  Or rather, longer cables triggered
> a LOT of problems.
> 
> > Is the only way to improve the connector stability by milling the
> > plastic casing to actually be able to insert the connector properly
> > or by contacting the retailer for a replacement?... Sorry, these are
> > not directly Linux driver questions, but the questions are really
> > what those error messages tell me about the possible reasons for the
> > problem:-)
> 
> Give a shot at shorter cable.

Hm, using a 62cm long cable ATM, should it be even shorter? It's going to 
be difficult physically then:-( But what about your drives - dies the 
connector fit well in the slot and sits firmaly there? With my disk looks 
likt the connector cannot be inserted completely because of too small a 
hole in plastic:-(

Thanks
Guennadi
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
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