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I have a RAID5 with 5 disks on my machine and suspect the motherboard chipset to fail at some points and make my raid going in degraded mode.

Last time it happened I noticed it on the failure of the 2nd drive connected to the same chipset and lost a lot of data. So I would like to prevent this, and especially I would like to have mdadm disable writes on the raid if one of the disk fails. So that in between I get notified, I recover and can use my system again. Sadly I could not find it in man mdadm so I was wondering if this is possible via a tool or hidden option since for me it looks like a standard feature of a RAID system.

If this is not possible I would also be happy with a solution to stop the raid if degraded.

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If you suspect a controller failure: replace the controller. Ignoring the problem won't make it go away.

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I know, it's just for the time I will require to find the root cause (probably coming in a future post ^^), meanwhile I need it working. – jolivier Oct 8 '12 at 21:52
    
this isn't an answer to the question at all, please attempt to answer what the OP has asked. – AlanTuring Oct 9 '12 at 2:02
    
@AlanTuring If someone asks "How can I painlessly shoot myself in the foot" my advice will always be: "do not shoot yourself". I will NOT knowingly provide any kind of assistance that may cause disaster for the user. Do not try to work around faulty hardware. Period. – Ansgar Wiechers Oct 9 '12 at 13:03
    
@AnsgarWiechers because you of course have a better overview of the user situation than himself and can better than himself judge the different solutions that he has in front of him to choose the correct one... Suppose I need the problem to reproduce itsel to have more information to decide what to replace (I just suspect until now) and I dont want to have to format my RAID5 each time this happen... – jolivier Oct 9 '12 at 15:15

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