A tool for remapping bad sectors in CURRENT?
000.fbsd at quip.cz
Mon Mar 8 11:21:50 UTC 2010
Eugeny N Dzhurinsky wrote:
> Hello, all!
> Recently I've started to see the following logs in messages:
> Mar 8 12:00:24 localhost smartd: Device: /dev/ad4, 2 Currently unreadable (pending) sectors
> Mar 8 12:00:24 localhost smartd: Device: /dev/ad4, 2 Offline uncorrectable sectors
> smartctl did really show that something is wrong with my HDD, but still no
> remaps - just read errors.
> SMART Self-test log structure revision number 1
> Num Test_Description Status Remaining LifeTime(hours) LBA_of_first_error
> # 1 Extended offline Completed: read failure 60% 1198 222342559
> # 2 Extended offline Completed: read failure 60% 1187 222342557
> # 3 Extended offline Completed: read failure 60% 1180 222342559
> # 4 Short offline Completed without error 00% 1178 -
> # 5 Extended offline Aborted by host 90% 1178 -
> ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE
> Reallocated_Sector_Ct 0x0033 100 100 036 Pre-fail Always - 0
> Now can I find out which file owns the LBAs 222342557 and 222342559 ? How do I
> force remapping of these sectors? I assume that I have to write something
> directly to the sectors?
We have this problem from time to time on bunch of machines. As we are
using gmirror, the easiest way is to force re-synchronization (rewrite)
of the whole drive. The problem is when there are Pending unreadable
sectors on both drives - it ends up with read error and some file(s) are
corrupted, but there is no easy way (on FreeBSD) to find what file.
I tried it in the past with fsdb / findblk, but it does not work as I
expect or I do not fully understand the needed calculations with slices
+ partitions offsets / LBAs and right meaning of the term "block". It
seems there are several meaning in different contexts.
It would be nice if somebody with enough FS / GEOM knowledge can write
some HowTo or shell script to do the calculations and operations to find
file containing bad sector(s) and put it in FAQ, Handbook, or Wiki.
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