Re: [BUG 2.6.21-rc3-git9] SATA NCQ failure with Samsum HD401LJ

[Jeff Garzik <jeff@garzik.org>]

Christian wrote:
> On Monday 19 March 2007 03:48:14 you wrote:
>> Christian wrote:
>>> On Sunday 18 March 2007 06:43:09 you wrote:
>>>> Christian wrote:
>>>>>> This does indeed look like a drive side issue to me (the controller is
>>>>>> reporting CPBs with response flags 2 which as far as I can tell
>>>>>> indicates it's still waiting for the drive to complete the request).
>>>>> I have been using this hw-config (SATA II, NCQ) since the nvidia ADMA
>>>>> support made it in the -mm kernel (maybe around 2.6.19-mm? or even
>>>>> earlyer). I'm seeing this problem excessively since I upgraded to
>>>>> 2.6.21-rc3-mm1. I think something got broken recently...
>>>> Can you post the result of "hdparm -I /dev/sdX"?
>>> Output generated on 2.6.21-rc3-mm1 #3 SMP PREEMPT
>>>
>>> user@ubuntu:~$ sudo hdparm -I /dev/sda
>>>
>>> /dev/sda:
>>>
>>> ATA device, with non-removable media
>>>         Model Number:       SAMSUNG HD401LJ
>>>         Serial Number:      S0HVJ1FL900207
>>>         Firmware Revision:  ZZ100-15
>>> Standards:
>>>         Used: ATA/ATAPI-7 T13 1532D revision 4a
>>>         Supported: 7 6 5 4
>>> Configuration:
>>>         Logical         max     current
>>>         cylinders       16383   16383
>>>         heads           16      16
>>>         sectors/track   63      63
>>>         --
>>>         CHS current addressable sectors:   16514064
>>>         LBA    user addressable sectors:  268435455
>>>         LBA48  user addressable sectors:  781422768
>>>         device size with M = 1024*1024:      381554 MBytes
>>>         device size with M = 1000*1000:      400088 MBytes (400 GB)
>> That's a fairly recent drive.  Does the problem go away if you downgrade
>> the kernel?
> 
> Yes, for me the problem was introduced recently. I have moved around terabytes 
> (sic!) on my discs with older kernels and I never got errors.

I may have missed the answer to this before, but:  does the problem go 
away if you disable preempt?

	Jeff