I'm suddenly seeing some strange behaviour on our USB backup drive that doesn't make sense to me:
(2013-10-21 14:58:23 [root@newdc /]$ cd /mnt/backup/
(2013-10-21 14:59:03 [root@newdc backup]$ ls -la
ls: reading directory .: Input/output error
total 0
(2013-10-21 14:59:05 [root@newdc backup]$ df -h /mnt/backup
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 917G 843G 28G 97% /mnt/backup
How is it possible for the OS to know how much is in use, but I can't ls any of it as root? Or more to the point, what problem does this indicate?
/var/log/messages said this:
Oct 21 14:57:54 g5 kernel: EXT4-fs error (device sda1): ext4_journal_start_sb: Detected aborted journal
Oct 21 14:57:54 g5 kernel: EXT4-fs (sda1): Remounting filesystem read-only
But…read-only is something different than 'throw an io error'…
After unmounting to try fsck on it, I had someone on-site look at it, and the drive was not spun up, and had a slow-flashing light, which I believe means it was in a power-suspend mode. So I had them unplug and replug the USB cable, and now (before remounting) it says:
fsck from util-linux-ng 2.17.2
e2fsck 1.41.12 (17-May-2010)
/dev/sda1: clean, 2805106/61046784 files, 181934167/244182016 blocks
I then mount it and now ls works and df reports:
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 917G 680G 191G 79% /mnt/backup
What would cause it to go into such a state without being asked to? Why all the weird behaviour, and now it appears to not be corrupt?
smartctl 5.43 2012-06-30 r3573 [x86_64-linux-2.6.32-358.11.1.el6.x86_64] (local build)
Copyright (C) 2002-12 by Bruce Allen, http://smartmontools.sourceforge.net
=== START OF INFORMATION SECTION ===
Device Model: WDC WD10JMVW-11S5XS0
Serial Number: WD-WX51AC2X2298
LU WWN Device Id: 5 0014ee 6587c0e18
Firmware Version: 01.01A01
User Capacity: 1,000,204,886,016 bytes [1.00 TB]
Sector Sizes: 512 bytes logical, 4096 bytes physical
Device is: Not in smartctl database [for details use: -P showall]
ATA Version is: 8
ATA Standard is: Exact ATA specification draft version not indicated
Local Time is: Wed Oct 23 20:08:46 2013 EDT
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
=== START OF READ SMART DATA SECTION ===
SMART STATUS RETURN: incomplete response, ATA output registers missing
SMART overall-health self-assessment test result: PASSED
Warning: This result is based on an Attribute check.
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: (18180) 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: ( 198) minutes.
Conveyance self-test routine
recommended polling time: ( 5) minutes.
SCT capabilities: (0x70b5) 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 188 179 021 Pre-fail Always - 1600
4 Start_Stop_Count 0x0032 100 100 000 Old_age Always - 940
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 098 098 000 Old_age Always - 2004
10 Spin_Retry_Count 0x0032 100 100 000 Old_age Always - 0
11 Calibration_Retry_Count 0x0032 100 100 000 Old_age Always - 0
12 Power_Cycle_Count 0x0032 100 100 000 Old_age Always - 744
192 Power-Off_Retract_Count 0x0032 200 200 000 Old_age Always - 12
193 Load_Cycle_Count 0x0032 197 197 000 Old_age Always - 9379
194 Temperature_Celsius 0x0022 115 098 000 Old_age Always - 32
196 Reallocated_Event_Count 0x0032 200 200 000 Old_age Always - 0
197 Current_Pending_Sector 0x0032 200 200 000 Old_age Always - 0
198 Offline_Uncorrectable 0x0030 100 253 000 Old_age Offline - 0
199 UDMA_CRC_Error_Count 0x0032 200 200 000 Old_age Always - 0
200 Multi_Zone_Error_Rate 0x0008 100 253 000 Old_age Offline - 0
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.
Interestingly, no errors are logged, even after an extended test apparently aborted spontaneously:
$ sudo smartctl -l error /dev/sda
smartctl 5.43 2012-06-30 r3573 [x86_64-linux-2.6.32-358.11.1.el6.x86_64] (local build)
Copyright (C) 2002-12 by Bruce Allen, http://smartmontools.sourceforge.net
=== START OF READ SMART DATA SECTION ===
SMART Error Log Version: 1
No Errors Logged
Best Answer
The filesystem is corrupt. It may even be very corrupt since not even
fsckworks. Maybe the hard disk is broken or something.dmesgto see if you have anything more regarding this FS error. Something which may indicate a broken disk?smartctl(from smartmontools, it's in the CentOS) commands to see for sure.