raid5:bad sectors after lost power

["vincent" <hanguozhong@meganovo.com>]

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Hi everyone:
    I have a problem about raid5.
    I created a raid5 with the command ¡°mdadm ¨CCv --chuck=128 /dev/md0 ¨C
l5 ¨Cn4 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 ¨CA /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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