Re: Check mdadm-Raid 5

[Rui Santos <rsantos@grupopie.com>]

Michael Mott wrote:
> Hi there,
>   
Hi,
> you're just my last hope - I think.
>
> I've posted this question at many Web-Sites in the last week, but nobody can help me.
>
> For a view days I've created a Software Raid 5 (mdadm) under Ubuntu 7.10 32Bit Alternate with 4 x 233 GiB SATA II Hdds @ USB 2.0.
>
> After that I want to create a Truecrypt-Volume on this md-Device what not should be a problem.
>
> But the Process hangs after a view Minutes running and then whole System hangs. So I've pushed the Power-Button and the System writes something to the System-Hdd - but then nothing happens further. Then I have resetted the System.
>
> After next boot I've assembled the Raid 5 again what function without any problem. The System even wont to resync anything.
>
> After that I've build the Truecrypt-Volume on the whole md-Device without any Problem. 
>
> Now my question: Is there any Methode to Test the integrity of die md-Device at low-level? Can I trust the Device?
>   

I use this script on a regular basis to check for RAID integrity. I hope 
this is what you mean.

#!/bin/bash

# Check all RAIDs
RAIDS_TO_CHECK="md0 md1 md2"

# Check all md's
for i in $RAIDS_TO_CHECK; do
        echo check >> /sys/block/$i/md/sync_action
        sleep 5
        while ( test `mdadm --misc --detail /dev/$i | grep -c "Rebuild 
Status"` -gt 0 ); do
                sleep 10
        done
        if ( test $(( `cat /sys/block/$i/md/mismatch_cnt` )) -gt 0 ); then
                echo repair >> /sys/block/$i/md/sync_action
                sleep 2
                while ( test `mdadm --misc --detail /dev/$i | grep -c 
"Rebuild Status"` -gt 0 ); do
                        sleep 10
                done
                echo "Warning: A Repair to RAID $i was needed..."
        fi
done

> Best regards,
>
> Michael
>   
Rui


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*Rui Santos*
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