On 08/15/2010 12:05 PM, Suvayu Ali wrote:
>> SMART Attributes Data Structure revision number: 16
>> Vendor Specific SMART Attributes with Thresholds:
>> ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE
>> 1 Raw_Read_Error_Rate 0x002f 199 199 051 Pre-fail Always - 1354
>> 3 Spin_Up_Time 0x0027 253 253 021 Pre-fail Always - 1158
>> 4 Start_Stop_Count 0x0032 100 100 000 Old_age Always - 40
>> 5 Reallocated_Sector_Ct 0x0033 200 200 140 Pre-fail Always - 0
>> 7 Seek_Error_Rate 0x002e 200 200 000 Old_age Always - 0
>> 9 Power_On_Hours 0x0032 099 099 000 Old_age Always - 1403
>> 10 Spin_Retry_Count 0x0032 100 253 000 Old_age Always - 0
>> 11 Calibration_Retry_Count 0x0032 100 253 000 Old_age Always - 0
>> 12 Power_Cycle_Count 0x0032 100 100 000 Old_age Always - 38
>> 192 Power-Off_Retract_Count 0x0032 200 200 000 Old_age Always - 21
>> 193 Load_Cycle_Count 0x0032 200 200 000 Old_age Always - 18
>> 194 Temperature_Celsius 0x0022 112 107 000 Old_age Always - 38
>> 196 Reallocated_Event_Count 0x0032 200 200 000 Old_age Always - 0
>> 197 Current_Pending_Sector 0x0032 199 199 000 Old_age Always - 172
>> 198 Offline_Uncorrectable 0x0030 200 200 000 Old_age Offline - 0
>> 199 UDMA_CRC_Error_Count 0x0032 200 200 000 Old_age Always - 0
>> 200 Multi_Zone_Error_Rate 0x0008 200 200 000 Old_age Offline - 0
>>
>> SMART Error Log Version: 1
>> No Errors Logged
>>
>> SMART Self-test log structure revision number 1
>> Num Test_Description Status Remaining LifeTime(hours) LBA_of_first_error
>> # 1 Extended offline Completed: read failure 90% 1393 1106820646
Your problem is the 172 sectors pending reallocation. Those are sectors
that are currently unreadable and will be reallocated to spare sectors
the next time they are written. The problem is that the drive has no
way to know whether the current contents are important (part of some
file, or file system metadata) or irrelevant (part of file system free
space), so the drive _must_ continue to return an error on any attempted
read of those sectors.
The most straightforward way to recover is to back up all of the data
now on the drive while making note of any files that have read errors,
write zeros to the entire drive, then re-make the file system(s) and
restore the data, hopefully having some other source for any important
files that could not be read when backing up.
Trying to use a less ham-fisted approach gets complicated in a hurry.
You need to identify every file affected by a bad sector and re-write
it, then find all of the bad sectors that are now part of free space and
re-write those (filling up the file system with a huge all-zero file
would be one way), and then hope that there are no bad sectors that are
part of file system metadata or otherwise inaccessible via normal file
I/O.
If it were my drive I'd probably make an attempt at rewriting any
affected files I could find (using dd with the "conv=notrunc" option so
that the OS won't reallocate the space) and hope I could get lucky (all
of the errors bunched in a few files that I could recover elsewhere or
simply overwrite with zeros and delete). In the end, I'd probably waste
more time than the simplistic approach would take, and with less
assurance of success.
--
Bob Nichols "NOSPAM" is really part of my email address.
Do NOT delete it.
--
users mailing list
users@xxxxxxxxxxxxxxxxxxxxxxx
To unsubscribe or change subscription options:
https://admin.fedoraproject.org/mailman/listinfo/users
Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
