Re: Trouble finding bad block on WDC WD1600SB-01KBA0

I've also seen the UDMA_CRC_ERROR_COUNT caused by a bad SATA cable. With
only 1, I wouldn't sweat it. The case I remember, the count was in the
hundreds. It stopped climbing after I switched out the cable. The existing
one was noticeably frayed.

> David, I think the UDMA_CRC_ERROR_COUNT is referring to a crc error on the
> data bus.  If that is right then it can be safely ignored; if it is
> recurring I would try and clean and replug the data connections to the
> drive.  Cheers, Bruce
>
>
>
>> On 11 Jan 2017, at 02:15, mathog <[email protected]> wrote:
>>
>> On 10-Jan-2017 02:07, Carlos E. R. wrote:
>>> On 2017-01-10 02:12, mathog wrote:
>>>> Hi,
>>>>
>>>> One system has a WDC WD1600SB-01KBA0 which shows
>>>>
>>>> 197 Current_Pending_Sector  0x0012   200   200   000    Old_age
>>>> Always
>>>>       -       1
>>>> 198 Offline_Uncorrectable   0x0012   200   200   000    Old_age
>>>> Always
>>>>       -       0
>>>> 199 UDMA_CRC_Error_Count    0x000a   200   253   000    Old_age
>>>> Always
>>>>       -       1
>>>
>>>> Is there some other trick to find the thing?
>>>
>>> I run "badblocks" with the intention of locating them, and they
>>> disappeared...
>>
>> Rebooted that node into PLD Rescue CD over the network, ssh'd into it
>> and ran
>>
>>    badblocks -nvs /dev/sda >/tmp/bb.log 2>&1 &
>>
>> somewhere along the line the pending sector cleared, but there was no
>> message
>> giving the block number, and it said there were no errors.  The
>> UDMA_CRC_ERROR_COUNT is still 1.
>>
>> So that worked.
>>
>> Now, for the next time, is there a command one can use
>> while the OS is running and the disk mounted that can do something
>> similar?
>> badblocks -n isn't happy running on mounted disks, and that badblocks
>> command took ~4.5 hours.
>>
>> Thanks,
>>
>> David Mathog
>> [email protected]
>> Manager, Sequence Analysis Facility, Biology Division, Caltech
>>
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Order your platform today. http://sdm.link/xeonphi