Mikael,
Thank you for your great help!
I could assemble /dev/md0 by using only /dev/sd[bde], and mount it (read only) to /home.
# mdadm --misc --stop /dev/md0
mdadm: stopped /dev/md0
# mdadm --assemble --force /dev/md0 /dev/sd[bde]
mdadm: forcing event count in /dev/sdb(0) from 34220 upto 34224
mdadm: /dev/md0 has been started with 3 drives (out of 4).
# cat /proc/mdstat
Personalities : [raid10]
md0 : active raid10 sdb[0] sde[3] sdd[2]
3907028992 blocks 1024K chunks 2 near-copies [4/3] [U_UU]
unused devices: <none>
> You need to figure out what happened to get sdb kicked out of the array,
> check logs and "dmesg". Also use smartctl to check sdb and see if it's
> failing.
Here's syslog entries about raid10 and smartctl output.
sdb seems to have too many bad blocks. Is that the reason why sdb was kicked out?
I'm going to copy files from /dev/md0 to anywhere else as soon as possible.
Should I repair filesystem before copying? (like xfs_repair /dev/md0)
Oct 23 18:11:29 localhost kernel: sd 0:0:1:0: [sdb] Sense Key : Medium Error [current] [descriptor]
Oct 23 18:11:29 localhost kernel: Descriptor sense data with sense descriptors (in hex):
Oct 23 18:11:29 localhost kernel: 72 03 11 04 00 00 00 0c 00 0a 80 00 00 00 00 00
Oct 23 18:11:29 localhost kernel: 11 af 30 10
Oct 23 18:11:29 localhost kernel: sd 0:0:1:0: [sdb] Add. Sense: Unrecovered read error - auto reallocate failed
Oct 23 18:11:29 localhost kernel: end_request: I/O error, dev sdb, sector 296693776
Oct 23 18:11:29 localhost kernel: ata1: EH complete
Oct 23 18:11:29 localhost kernel: raid10: Disk failure on sdb, disabling device.
Oct 23 18:11:29 localhost kernel: raid10: Operation continuing on 2 devices.
Oct 23 18:11:29 localhost kernel: raid10: sdb: unrecoverable I/O read error for block 593387520
Oct 23 18:11:29 localhost kernel: raid10: sdb: unrecoverable I/O read error for block 593387768
Oct 23 18:11:29 localhost kernel: raid10: sdb: unrecoverable I/O read error for block 593388016
Oct 23 18:11:29 localhost kernel: raid10: sdb: unrecoverable I/O read error for block 593396704
Oct 23 18:11:29 localhost kernel: raid10: sdb: unrecoverable I/O read error for block 593396952
Oct 23 18:11:29 localhost kernel: raid10: sdb: unrecoverable I/O read error for block 593397200
# badblocks /dev/sdb > sdb.bad
# wc -l sdb.bad
69 sdb.bad
# smartctl -a /dev/sdb
smartctl version 5.38 [i386-redhat-linux-gnu] Copyright (C) 2002-8 Bruce Allen
Home page is http://smartmontools.sourceforge.net/
=== START OF INFORMATION SECTION ===
Device Model: ST2000DM001-9YN164
Serial Number: W240D0XN
Firmware Version: CC4C
User Capacity: 2,000,398,934,016 bytes
Device is: Not in smartctl database [for details use: -P showall]
ATA Version is: 8
ATA Standard is: ATA-8-ACS revision 4
Local Time is: Thu Oct 24 18:48:02 2013 JST
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
See vendor-specific Attribute list for marginal Attributes.
General SMART Values:
Offline data collection status: (0x00) Offline data collection activity
was never started.
Auto Offline Data Collection: Disabled.
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: ( 592) seconds.
Offline data collection
capabilities: (0x73) SMART execute Offline immediate.
Auto Offline data collection on/off support.
Suspend Offline collection upon new
command.
No 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: ( 1) minutes.
Extended self-test routine
recommended polling time: ( 255) minutes.
Conveyance self-test routine
recommended polling time: ( 2) minutes.
SCT capabilities: (0x3085) SCT Status supported.
SMART Attributes Data Structure revision number: 10
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE
1 Raw_Read_Error_Rate 0x000f 115 097 006 Pre-fail Always - 88125160
3 Spin_Up_Time 0x0003 093 093 000 Pre-fail Always - 0
4 Start_Stop_Count 0x0032 100 100 020 Old_age Always - 14
5 Reallocated_Sector_Ct 0x0033 100 100 036 Pre-fail Always - 0
7 Seek_Error_Rate 0x000f 068 060 030 Pre-fail Always - 6495909
9 Power_On_Hours 0x0032 086 086 000 Old_age Always - 12734
10 Spin_Retry_Count 0x0013 100 100 097 Pre-fail Always - 0
12 Power_Cycle_Count 0x0032 100 100 020 Old_age Always - 14
183 Unknown_Attribute 0x0032 100 100 000 Old_age Always - 0
184 Unknown_Attribute 0x0032 100 100 099 Old_age Always - 0
187 Reported_Uncorrect 0x0032 001 001 000 Old_age Always - 655
188 Unknown_Attribute 0x0032 100 100 000 Old_age Always - 0
189 High_Fly_Writes 0x003a 100 100 000 Old_age Always - 0
190 Airflow_Temperature_Cel 0x0022 053 038 045 Old_age Always In_the_past 47 (13 90 58 39)
191 G-Sense_Error_Rate 0x0032 100 100 000 Old_age Always - 0
192 Power-Off_Retract_Count 0x0032 100 100 000 Old_age Always - 7
193 Load_Cycle_Count 0x0032 096 096 000 Old_age Always - 9838
194 Temperature_Celsius 0x0022 047 062 000 Old_age Always - 47 (0 21 0 0)
197 Current_Pending_Sector 0x0012 100 100 000 Old_age Always - 112
198 Offline_Uncorrectable 0x0010 100 100 000 Old_age Offline - 112
199 UDMA_CRC_Error_Count 0x003e 200 200 000 Old_age Always - 0
240 Head_Flying_Hours 0x0000 100 253 000 Old_age Offline - 106154411688763
241 Unknown_Attribute 0x0000 100 253 000 Old_age Offline - 956764483658
242 Unknown_Attribute 0x0000 100 253 000 Old_age Offline - 154136770090
SMART Error Log Version: 1
ATA Error Count: 522 (device log contains only the most recent five errors)
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 522 occurred at disk power-on lifetime: 12729 hours (530 days + 9 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 00 ff ff ff 0f Error: UNC at LBA = 0x0fffffff = 268435455
Commands leading to the command that caused the error were:
CR FR SC SN CL CH DH DC Powered_Up_Time Command/Feature_Name
-- -- -- -- -- -- -- -- ---------------- --------------------
25 00 08 ff ff ff ef 00 23d+01:40:53.125 READ DMA EXT
27 00 00 00 00 00 e0 00 23d+01:40:53.124 READ NATIVE MAX ADDRESS EXT
ec 00 00 00 00 00 a0 00 23d+01:40:53.121 IDENTIFY DEVICE
ef 03 46 00 00 00 a0 00 23d+01:40:53.119 SET FEATURES [Set transfer mode]
27 00 00 00 00 00 e0 00 23d+01:40:53.090 READ NATIVE MAX ADDRESS EXT
Error 521 occurred at disk power-on lifetime: 12729 hours (530 days + 9 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 00 ff ff ff 0f Error: UNC at LBA = 0x0fffffff = 268435455
Commands leading to the command that caused the error were:
CR FR SC SN CL CH DH DC Powered_Up_Time Command/Feature_Name
-- -- -- -- -- -- -- -- ---------------- --------------------
25 00 08 ff ff ff ef 00 23d+01:40:50.249 READ DMA EXT
27 00 00 00 00 00 e0 00 23d+01:40:50.249 READ NATIVE MAX ADDRESS EXT
ec 00 00 00 00 00 a0 00 23d+01:40:50.246 IDENTIFY DEVICE
ef 03 46 00 00 00 a0 00 23d+01:40:50.243 SET FEATURES [Set transfer mode]
27 00 00 00 00 00 e0 00 23d+01:40:50.215 READ NATIVE MAX ADDRESS EXT
Error 520 occurred at disk power-on lifetime: 12729 hours (530 days + 9 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 00 ff ff ff 0f Error: UNC at LBA = 0x0fffffff = 268435455
Commands leading to the command that caused the error were:
CR FR SC SN CL CH DH DC Powered_Up_Time Command/Feature_Name
-- -- -- -- -- -- -- -- ---------------- --------------------
25 00 08 ff ff ff ef 00 23d+01:40:47.373 READ DMA EXT
27 00 00 00 00 00 e0 00 23d+01:40:47.372 READ NATIVE MAX ADDRESS EXT
ec 00 00 00 00 00 a0 00 23d+01:40:47.369 IDENTIFY DEVICE
ef 03 46 00 00 00 a0 00 23d+01:40:47.367 SET FEATURES [Set transfer mode]
27 00 00 00 00 00 e0 00 23d+01:40:47.340 READ NATIVE MAX ADDRESS EXT
Error 519 occurred at disk power-on lifetime: 12729 hours (530 days + 9 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 00 ff ff ff 0f Error: UNC at LBA = 0x0fffffff = 268435455
Commands leading to the command that caused the error were:
CR FR SC SN CL CH DH DC Powered_Up_Time Command/Feature_Name
-- -- -- -- -- -- -- -- ---------------- --------------------
25 00 08 ff ff ff ef 00 23d+01:40:44.506 READ DMA EXT
27 00 00 00 00 00 e0 00 23d+01:40:44.505 READ NATIVE MAX ADDRESS EXT
ec 00 00 00 00 00 a0 00 23d+01:40:44.502 IDENTIFY DEVICE
ef 03 46 00 00 00 a0 00 23d+01:40:44.499 SET FEATURES [Set transfer mode]
27 00 00 00 00 00 e0 00 23d+01:40:44.472 READ NATIVE MAX ADDRESS EXT
Error 518 occurred at disk power-on lifetime: 12729 hours (530 days + 9 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 00 ff ff ff 0f Error: UNC at LBA = 0x0fffffff = 268435455
Commands leading to the command that caused the error were:
CR FR SC SN CL CH DH DC Powered_Up_Time Command/Feature_Name
-- -- -- -- -- -- -- -- ---------------- --------------------
25 00 08 ff ff ff ef 00 23d+01:40:41.622 READ DMA EXT
27 00 00 00 00 00 e0 00 23d+01:40:41.622 READ NATIVE MAX ADDRESS EXT
ec 00 00 00 00 00 a0 00 23d+01:40:41.618 IDENTIFY DEVICE
ef 03 46 00 00 00 a0 00 23d+01:40:41.616 SET FEATURES [Set transfer mode]
27 00 00 00 00 00 e0 00 23d+01:40:41.589 READ NATIVE MAX ADDRESS EXT
SMART Self-test log structure revision number 1
No self-tests have been logged. [To run self-tests, use: smartctl -t]
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.
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