Re: raid1 issue after disk failure: both disks of the array are still active

["Niccolò Belli" <darkbasic@linuxsystems.it>]

I finally managed to reallocate the sectors!

I tried with sg3-utils but I get:

root@asterisk:~# sg_reassign --address=3912 /dev/sda
REASSIGN BLOCKS not supported

then I read this on the smartmontools mailing list:

<<
Possibly what is happening is that because he is only writing a partial
block, the OS is first trying to read the the original block so that it
can preserve the parts that won't be changing. When this operation fails,
it blocks the write that would trigger reallocation of the bad sector.
Writing using the OS blocksize (typically 4096 on linux systems) properly
aligned should work around that issue.
 >>

so I tried with

dd if=/dev/zero of=/dev/sda bs=4096

and ta-daaa! :D

197 Current_Pending_Sector  0x0012   100   100   000    Old_age   Always 
       -       *0*
198 Offline_Uncorrectable   0x0030   100   100   000    Old_age 
Offline      -       1


Current_Pending_Sector are gone!


with a smartctl -t offline /dev/sda I removed the Offline_Uncorrectable too:

197 Current_Pending_Sector  0x0012   100   100   000    Old_age   Always 
       -       0
198 Offline_Uncorrectable   0x0030   100   100   000    Old_age 
Offline      -       *0*




For the sake of google:

     Reallocated_Event_Count

     This is how many sectors have already been reallocated on the 
drive. We're hoping to get the hard disk to increase this number!

     Current_Pending_Sector

     The number of sectors that the drive thinks are dodgy. Bear in mind 
sometimes drives change their mind about whether a sector is bad or not 
- so this number can go down without a reallocation occuring.

     Offline_Uncorrectable

     This is the number of sectors that the drive has attempted to 
correct itself, but failed. Running the command:

     smartctl -t offline /dev/hda

     should cause the drive to test the sectors and attempt to fix them. 
Not all drives support this though.




Thanks for helping!
Niccolò
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http://www.linuxsystems.it
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