Re: raid5:bad sectors after lost power

On 13/09/12 16:43, vincent wrote:

Hi everyone:
     I have a problem about raid5.
     I created a raid5 with the command “mdadm –Cv --chuck=128 /dev/md0 –
l5 –n4 sd[abcd]” for write performance test, the capacity of each disk is
2TB. After the array was created, I modified the strip_catch_size of it to
2048.
     Then I used a program to parallel write 150 files to the array, the
speed of each is 1MB/s. Unfortunately, the electricity went off suddenly at
the time. when I turn on the device again, I found the raid5 is in recovery.
When     the progress of the recovery went up to 98%, there was a write
error occurred. I used “smartctl –A /dev/sd*” to check the heath status
of these disks. I found the “RAW_VALUE” of the attribute whose name was
“Current_Pending_Sector” of sda and sdb were 1.
　　Then I used “HDD_Regenerator” to check if there were bad blocks in the
disks. The result of the output indicated that sda and sdb did have a bad
sector.
     These disks were used for the first time after purchased. Is it normal
to have bad sectors? Could you please help me?


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RMA the HDDs (or return to vendor), they are not healthy.


// Mathias
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