What’s wrong with the messages like “UnrecovData 10B8B BadCRC” and “failed command: READ FPDMA QUEUED” on Linux?
I keep seeing messages in dmesg as follows with “exception Emask 0x10” -> “SError: { UnrecovData 10B8B BadCRC }” -> “failed command: READ FPDMA QUEUED” -> “hard resetting link”:
[ 7395.936692] ata4.00: exception Emask 0x10 SAct 0xe000 SErr 0x280100 action 0x6 frozen
[ 7395.936701] ata4.00: irq_stat 0x08000000, interface fatal error
[ 7395.936703] ata4: SError: { UnrecovData 10B8B BadCRC }
[ 7395.936705] ata4.00: failed command: READ FPDMA QUEUED
[ 7395.936708] ata4.00: cmd 60/00:68:20:7c:b0/04:00:7c:00:00/40 tag 13 ncq 524288 in
res 40/00:78:20:84:b0/00:00:7c:00:00/40 Emask 0x10 (ATA bus error)
[ 7395.936709] ata4.00: status: { DRDY }
[ 7395.936710] ata4.00: failed command: READ FPDMA QUEUED
[ 7395.936712] ata4.00: cmd 60/00:70:20:80:b0/04:00:7c:00:00/40 tag 14 ncq 524288 in
res 40/00:78:20:84:b0/00:00:7c:00:00/40 Emask 0x10 (ATA bus error)
[ 7395.936713] ata4.00: status: { DRDY }
[ 7395.936714] ata4.00: failed command: READ FPDMA QUEUED
[ 7395.936715] ata4.00: cmd 60/e0:78:20:84:b0/03:00:7c:00:00/40 tag 15 ncq 507904 in
res 40/00:78:20:84:b0/00:00:7c:00:00/40 Emask 0x10 (ATA bus error)
[ 7395.936716] ata4.00: status: { DRDY }
[ 7395.936719] ata4: hard resetting link
[ 7396.241404] ata4: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
[ 7396.243180] ata4.00: configured for UDMA/133
[ 7396.243195] ata4: EH complete
It seems are disks related warnings/errors.
ata4 seems the disk sdd:
# ls -l /sys/class/block/ | grep ata4
lrwxrwxrwx 1 root root 0 May 5 15:04 sdd -> ../../devices/pci0000:00/0000:00:1f.2/ata4/host3/target3:0:0/3:0:0:0/block/sdd
lrwxrwxrwx 1 root root 0 May 5 15:04 sdd1 -> ../../devices/pci0000:00/0000:00:1f.2/ata4/host3/target3:0:0/3:0:0:0/block/sdd/sdd1
The smartctl checking on sdd shows:
# smartctl -a /dev/sdd
smartctl 6.2 2014-07-16 r3952 [x86_64-linux-3.17.8-200.fc20.x86_64] (local build)
Copyright (C) 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org
=== START OF INFORMATION SECTION ===
Model Family: Seagate Barracuda 7200.14 (AF)
Device Model: ST2000DM001-1CH164
Serial Number: .........
LU WWN Device Id: 5 000c50 072c9ba25
Firmware Version: CC29
User Capacity: 2,000,398,934,016 bytes [2.00 TB]
Sector Sizes: 512 bytes logical, 4096 bytes physical
Rotation Rate: 7200 rpm
Device is: In smartctl database [for details use: -P show]
ATA Version is: ACS-2, ACS-3 T13/2161-D revision 3b
SATA Version is: SATA 3.1, 6.0 Gb/s (current: 3.0 Gb/s)
Local Time is: Tue May 5 15:08:13 2015 CST
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: (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: ( 600) 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: ( 225) 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 119 099 006 Pre-fail Always - 229791872
3 Spin_Up_Time 0x0003 096 096 000 Pre-fail Always - 0
4 Start_Stop_Count 0x0032 100 100 020 Old_age Always - 7
5 Reallocated_Sector_Ct 0x0033 100 100 010 Pre-fail Always - 0
7 Seek_Error_Rate 0x000f 073 060 030 Pre-fail Always - 21876240
9 Power_On_Hours 0x0032 097 097 000 Old_age Always - 3330
10 Spin_Retry_Count 0x0013 100 100 097 Pre-fail Always - 0
12 Power_Cycle_Count 0x0032 100 100 020 Old_age Always - 6
183 Runtime_Bad_Block 0x0032 099 099 000 Old_age Always - 1
184 End-to-End_Error 0x0032 100 100 099 Old_age Always - 0
187 Reported_Uncorrect 0x0032 100 100 000 Old_age Always - 0
188 Command_Timeout 0x0032 100 100 000 Old_age Always - 3 3 3
189 High_Fly_Writes 0x003a 100 100 000 Old_age Always - 0
190 Airflow_Temperature_Cel 0x0022 070 064 045 Old_age Always - 30 (Min/Max 29/31)
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 - 6
193 Load_Cycle_Count 0x0032 060 060 000 Old_age Always - 81321
194 Temperature_Celsius 0x0022 030 040 000 Old_age Always - 30 (0 22 0 0 0)
197 Current_Pending_Sector 0x0012 100 100 000 Old_age Always - 0
198 Offline_Uncorrectable 0x0010 100 100 000 Old_age Offline - 0
199 UDMA_CRC_Error_Count 0x003e 200 200 000 Old_age Always - 5
240 Head_Flying_Hours 0x0000 100 253 000 Old_age Offline - 2784h+08m+57.117s
241 Total_LBAs_Written 0x0000 100 253 000 Old_age Offline - 8817986301
242 Total_LBAs_Read 0x0000 100 253 000 Old_age Offline - 18410704178
SMART Error Log Version: 1
No Errors Logged
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.
The results seem fine. What’s wrong on this server as indicated by the messages from dmesg?
Found some good sources of information related to ata error messages and some useful tips.
Understanding these messages
DRDY: Device ready. Normally 1, when all is OK.
UnrecovData: Data integrity error occurred, interface did not recover
BadCRC: Link layer CRC error occurred
Reference: Libata error messages
Possible reasons
An example:
ata3.00: exception Emask 0x50 SAct 0x1 SErr 0x280900 action 0x6 frozen
ata3.00: irq_stat 0x08000000, interface fatal error
ata3: SError: { 10B8B BadCRC } often may also include DisPar, UnrecovData, and/or HostIntFrom an expert:
“Your machine seems to be suffering genuine link layer problem. In most cases, this indicates hardware problem and in my experience, common causes are (in the order of ballpark frequency)…
# inadequate power supply
# device and controller don’t like each other on 3Gbps
# cable too long or flaky connector (especially with eSATA cables or genders or backplanes)
# faulty controller or drive”
— tejun ( http://lkml.org/lkml/2008/12/2/426 ) (written by one of the foremost experts)
The presence of BadCRC is a pretty good indicator of a poor quality SATA cable. However, if a better cable does not solve the issue, then it is probably a power problem (loose power cable or backplane connection, poor connectors, poor power splitter, overloaded power supply, too many drives on power rail, bad power supply, etc).
Reference: The Analysis of Drive Issues
I had the same issue. I replaced a 1 meter long SATA cable that was attached to the affected drive with a shorter one and the problem went away.