Sectors pending re-allocation

Hi,

I’ve a bad block on my WD MBWE (white light, single drive) since yesterday morning. (I’m monitoring this drive with Nagios3 and got a ‘Sectors pending re-allocation’-warning)

Here is the output of smartctl:

$ smartctl -d ata -t long /dev/sda...$ smartctl -d ata -l selftest /dev/sda 
smartctl 5.40 2010-10-16 r3189 [arm-none-linux-gnueabi] (local build)
Copyright (C) 2002-10 by Bruce Allen, http://smartmontools.sourceforge.net

=== START OF READ SMART DATA SECTION ===
SMART Self-test log structure revision number 1
Num Test_Description Status Remaining LifeTime(hours) LBA_of_first_error
# 1 Extended offline Completed without error 00% 16395 -
$ 
$ smartctl -d ata -a /dev/sda 
smartctl 5.40 2010-10-16 r3189 [arm-none-linux-gnueabi] (local build)
Copyright (C) 2002-10 by Bruce Allen, http://smartmontools.sourceforge.net

=== START OF INFORMATION SECTION ===
Model Family: Western Digital Caviar Green family
Device Model: WDC WD10EADS-11M2B2
Serial Number: WD-WCAV59095523
Firmware Version: 80.00A80
User Capacity: 1,000,204,886,016 bytes
Device is: In smartctl database [for details use: -P show]
ATA Version is: 8
ATA Standard is: Exact ATA specification draft version not indicated
Local Time is: Sun May 13 04:42:58 2012 CEST
SMART support is: Available - device has SMART capability.
SMART support is: Enabled

=== START OF READ SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED

General SMART Values:
Offline data collection status: (0x82)	Offline data collection activity
					was completed without error.
					Auto Offline Data Collection: Enabled.
Self-test execution status: ( 0)	The previous self-test routine completed
					without error or no self-test has ever 
					been run.
Total time to complete Offline 
data collection: (18960) seconds.
Offline data collection
capabilities: (0x7b) SMART execute Offline immediate.
					Auto Offline data collection on/off support.
					Suspend Offline collection upon new
					command.
					Offline surface scan supported.
					Self-test supported.
					Conveyance Self-test supported.
					Selective Self-test supported.
SMART capabilities: (0x0003)	Saves SMART data before entering
					power-saving mode.
					Supports SMART auto save timer.
Error logging capability: (0x01)	Error logging supported.
					General Purpose Logging supported.
Short self-test routine 
recommended polling time: ( 2) minutes.
Extended self-test routine
recommended polling time: ( 219) minutes.
Conveyance self-test routine
recommended polling time: ( 5) minutes.
SCT capabilities: (0x3031)	SCT Status supported.
					SCT Feature Control supported.
					SCT Data Table supported.

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 200 200 051 Pre-fail Always - 0
  3 Spin_Up_Time 0x0027 128 126 021 Pre-fail Always - 6600
  4 Start_Stop_Count 0x0032 089 089 000 Old_age Always - 11901
  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 078 078 000 Old_age Always - 16409
 10 Spin_Retry_Count 0x0032 100 100 000 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 - 20
192 Power-Off_Retract_Count 0x0032 200 200 000 Old_age Always - 11
193 Load_Cycle_Count 0x0032 001 001 000 Old_age Always - 986214
194 Temperature_Celsius 0x0022 096 090 000 Old_age Always - 51
196 Reallocated_Event_Count 0x0032 200 200 000 Old_age Always - 0
197 Current_Pending_Sector 0x0032 200 200 000 Old_age Always - 1
198 Offline_Uncorrectable 0x0030 200 200 000 Old_age Offline - 1
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 - 1

SMART Error Log Version: 1
ATA Error Count: 1
	CR = Command Register [HEX]
	FR = Features Register [HEX]
	SC = Sector Count Register [HEX]
	SN = Sector Number Register [HEX]
	CL = Cylinder Low Register [HEX]
	CH = Cylinder High Register [HEX]
	DH = Device/Head Register [HEX]
	DC = Device Command Register [HEX]
	ER = Error register [HEX]
	ST = Status register [HEX]
Powered_Up_Time is measured from power on, and printed as
DDd+hh:mm:SS.sss where DD=days, hh=hours, mm=minutes,
SS=sec, and sss=millisec. It "wraps" after 49.710 days.

Error 1 occurred at disk power-on lifetime: 15791 hours (657 days + 23 hours)
  When the command that caused the error occurred, the device was active or idle.

  After command completion occurred, registers were:
  ER ST SC SN CL CH DH
  -- -- -- -- -- -- --
  40 51 10 28 3c 57 eb Error: UNC 16 sectors at LBA = 0x0b573c28 = 190266408

  Commands leading to the command that caused the error were:
  CR FR SC SN CL CH DH DC Powered_Up_Time Command/Feature_Name
  -- -- -- -- -- -- -- -- ---------------- --------------------
  c8 00 10 28 3c 57 eb 00 20d+00:25:36.876 READ DMA

SMART Self-test log structure revision number 1
Num Test_Description Status Remaining LifeTime(hours) LBA_of_first_error
# 1 Extended offline Completed without error 00% 16395 -

SMART Selective self-test log data structure revision number 1
 SPAN MIN_LBA MAX_LBA CURRENT_TEST_STATUS
    1 0 0 Not_testing
    2 0 0 Not_testing
    3 0 0 Not_testing
    4 0 0 Not_testing
    5 0 0 Not_testing
Selective self-test flags (0x0):
  After scanning selected spans, do NOT read-scan remainder of disk.
If Selective self-test is pending on power-up, resume after 0 minute delay.

I know how to fix this on a normal drive with ext2/3 (e.g. like this) but how to deal with sw-raid (/dev/mdX) and xfs? Does someone has a hint for me please?

Edit: Firmware version 01.01.18

log and volume status in web-admin doesn’t have any error regarding this.

You might have better results posting on the internal drives board