Updating bad block inode

SMART Self-test log structure revision number 1 Num Test_Description Status Remaining Life Time(hours) LBA_of_first_error # 1 Short offline Completed: read failure 90% 66 37383668Disk /dev/hdb: 9729 cylinders, 255 heads, 63 sectors/track Units = sectors of 512 bytes, counting from 0Device Boot Start End #sectors Id System /dev/hdb1 63 996029 995967 82 Linux swap / Solaris /dev/hdb2 * 996030 1188809 192780 83 Linux /dev/hdb3 1188810 156296384 155107575 8e Linux LVM /dev/hdb4 0 - 0 0 Empty The bad block is in /dev/hdb3 partition, which is an LVM based partition.

The offset of this block is: (37383668 - 1188810) = 36194858The physical partition used by LVM is divided into PE (Physical Extent).

This article describes the actions that can be taken when smartmontools detect and report some bad blocks on the disks.

The smartmontools package provides two utilities: smartrd and smartctl.smartd is the deamon that polls the ATA and SCSI devices every 30 minutes (this value can be changed) and logs the SMART errors and changes in SMART attributes using SYSLOG interface.

This command will run until there is no space left on the filesystem. The SMART error log indicates the bad block address to be 58656333.

The partition table indicates that the block is in a partition with Reiser FS filesystem, starting at block address 54781650.

This command is used to write the raw bits on the faulty drive. In this case, the file created has all zeroes on the bit level, i.e. Now that we know the basic usage of dd command, we can proceed to the examples.

The bad blocks in a storage device are the portions of the device that are not readable for some reason.Use debugfs to locate the inode stored in this block, and hence the file that is stored at that location.In this case, the problematic file is: /data/S1/R/H/714197568-714203359/H-R-714202192-16In case of ext3 filesystem, this block can be the part of journal itself.The inode will be very small and debugfs will not be able to report any filename.root]# smartctl -A /dev/hda ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE 5 Reallocated_Sector_Ct 0x0033 100 100 005 Pre-fail Always - 1 196 Reallocated_Event_Count 0x0032 100 100 000 Old_age Always - 1 197 Current_Pending_Sector 0x0022 100 100 000 Old_age Always - 0 198 Offline_Uncorrectable 0x0008 100 100 000 Old_age Offline - 1To: ballen Subject: SMART error (selftest) detected on host: medusa-slave166.This email was generated by the smartd daemon running on host: medusa-slave166.in the domain: master001-nis The following warning/error was logged by the smartd daemon: Device: /dev/hda, Self-Test Log error count increased from 0 to 1ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE 5 Reallocated_Sector_Ct 0x0033 100 100 005 Pre-fail Always - 0 196 Reallocated_Event_Count 0x0032 100 100 000 Old_age Always - 0 197 Current_Pending_Sector 0x0022 100 100 000 Old_age Always - 3 198 Offline_Uncorrectable 0x0008 100 100 000 Old_age Offline - 3 35495734 1 0 records in 1 0 records out 35495735 dd: reading `/dev/hda': Input/output error 0 0 records in 0 0 records out 35495751 dd: reading `/dev/hda': Input/output error 0 0 records in 0 0 records out 35495752 1 0 records in 1 0 records out This shows that 17 sectors 35495735-35495751 are unreadable.The filesystem blocks that contain this area are: L=35495735 to 35495751 S=5269320 B=4096 so b=3778301 to 3778303To identify files at these locations, we run debugfs:[root]# debugfs debugfs 1.32 (09-Nov-2002) debugfs: open /dev/hda3 debugfs: icheck 3778301 Block Inode number 3778301 45192 debugfs: icheck 3778302 Block Inode number 3778302 45192 debugfs: icheck 3778303 Block Inode number 3778303 45192 debugfs: ncheck 45192 Inode Pathname 45192 /S1/R/H/714979488-714985279/H-R-714979984-16debugfs: quit ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE 5 Reallocated_Sector_Ct 0x0033 100 100 005 Pre-fail Always - 0 196 Reallocated_Event_Count 0x0032 100 100 000 Old_age Always - 0 197 Current_Pending_Sector 0x0022 100 100 000 Old_age Always - 0 198 Offline_Uncorrectable 0x0008 100 100 000 Old_age Offline - 0In the above examples, we have not considered the case when the bad blocks are not assigned to any file.

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