Is it normal for a SAS drive to have a few bad blocks, or should I replace my drive ASAP?

Posted by Nate on Server Fault See other posts from Server Fault or by Nate
Published on 2011-06-29T16:27:10Z Indexed on 2011/06/30 0:23 UTC
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raid

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disk

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hardware-raid

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sas

I have a drive—part of a RAID 1 mirror—that has two bad blocks. Adaptec Storage Manger e-mailed me when it detected the blocks. It shows 4 medium errors for that drive, but state is still “optimal”.

This is my first time using Adaptec RAID controllers. I don’t know if an occasional bad block is normal, or if I should immediately replace that drive.

Update: The drive failed later the same day!

The disk subsystem is:

Adaptec 6405 with ZMM
(2) Seagate near-line SAS drives (ST31000424SS)

The other drive hasn’t reported any bad blocks yet. I am running a consistency check.

Adaptec Storage Manager screenshot

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