Re: RAID barely usable on my home machine

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On Thu Apr 04, 2013 at 10:13:05 +0200, Maik Zumstrull wrote:

> Hello Linux RAID and ATA people,
> 
> I've managed to find a configuration on my home desktop where a
> particular RAID array is barely usable.
> 
> You can find my initial report at:
> http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=700975
> 
> In summary:
> 
> - I create an array across four disks on a Marvell AHCI controller,
> which automatically goes into rebuild mode.
> - Somebody (e.g. smartd or udisks2 or me, testing) sends a SMART
> command to one of the disks.
> - The SMART command fails.
> - The ATA subsystems freaks out all over the place, until eventually
> none of the disks on that controller are responsive.
> - The array is dead until reboot. (Curiously, without data loss so
> far. Kudos on the RAID code, I guess.)
> 
> I've found the issue to be highly reproducible so far. Things mostly
> work if the array is not under heavy load (not rebuilding, no big file
> copies going on) or I make completely sure nothing sends SMART
> commands. I currently do keep real files on that array, but backed-up
> ones, so I could wipe it for more tests if really necessary.
> 
I used to have the same issues on one of my machines. The solution was
to buy a decent SAS/SATA HBA (I went with the Intel RS2WC080, but see
http://blog.zorinaq.com/?e=10 for a more complete list), which now works
perfectly with exactly the same drives as before.

HTH,
    Robin
-- 
     ___        
    ( ' }     |       Robin Hill        <robin@xxxxxxxxxxxxxxx> |
   / / )      | Little Jim says ....                            |
  // !!       |      "He fallen in de water !!"                 |

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