See if these are "real" read errors, errors that the OS will see (dd
if=/dev/sdX of=/dev/null bs=1M).
If yes, get another disk and duplicate the problematic disk using
dd_rescue and use the new one instead of the old one.
Once the array is up again make sure to do a raid check in regular intervals.
Kind regards,
Alex.
----- Message from fld@xxxxxxxxxx ---------
Date: Sat, 8 Jan 2011 14:49:53 +0200
From: FLD <fld@xxxxxxxxxx>
Subject: Bad sectors on a degraded array
To: linux-raid@xxxxxxxxxxxxxxx
While waiting for my RMA'd disk to return I noticed that one device in
my degraded (4 out of 5) raid5 has developed some bad sectors:
1 Raw_Read_Error_Rate 0x002f 200 200 051 - 0
196 Reallocated_Event_Count 0x0032 200 200 000 - 0
197 Current_Pending_Sector 0x0032 200 200 000 - 3
198 Offline_Uncorrectable 0x0030 200 200 000 - 3
I did some Self-test'ing and got some errors:
# 1 Extended offline Completed: read failure 50% 6640
1158803416
# 2 Short offline Completed without error 00% 6637
# 3 Extended offline Completed: read failure 50% 6634
1158820656
At this point those bad secotrs haven't caused any harm or errors in
dmesg while the array is mounted r/w and being used. What I'm wondering
is what kind of steps should I take once the RMA replacement arrives?
I know md doesn't like read errors very much and I'm thinking with smart
output like that it's very likely theres gonna be some read errors during
rebuild?
According to smartmontool documentation this is a pretty common situation
for a hard disk. There's a nice tutorial how to fix errors like this at:
http://smartmontools.sourceforge.net/badblockhowto.html , so I wonder if
I should --stop the array and try to manually fix the bad sectors before
I try rebuilding?
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