[sdiy] OT: how to save a dead Raided Drive?

[Dan Snazelle]

sadly most people who buy these external drives (including myself) dont even know they ARE striped raid drives.





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----------------------------------------
> Date: Sun, 28 Jun 2009 13:29:35 +0200
> From: aym-htnys at teaser.fr
> To: samppa.tolvanen at gmail.com
> Subject: Re: [sdiy] OT: how to save a dead Raided Drive?
> CC: synth-diy at dropmix.xs4all.nl
>
> On 2009-06-27 16:27 +0300, Samppa Tolvanen wrote:
>> On Sat, Jun 27, 2009 at 4:04 PM, Andre Majorel wrote:
>>>
>>>> it is very unlikely that both drives would mechanically fail at
>>>> once right?
>>>
>>> Yes, though I've seen drives from the same batch fail a couple
>>> days apart, while installed in different computers.
>>
>> How come MTBF has become so predictable these says?
>
> Consider this model : the time of failure is a bell curve centred
> around the MTBF so that, say, 50% of disks die between 0.8 MTBF
> and 1.2 MTBF. When the MTBF is 5 years, the bulk of failures will
> occur over a two-year span.
>
> Now take a bad batch whose actual MTBF is 5 weeks. The bulk of
> failures will occur over a two-week span. The possibility of two
> disks dying the same day doesn't look so remote now, does it ?
>
> This is of course a simplistic model but you get the idea.
>
> And that is why setting up a RAID from N identical disks bought at
> the same time is asking for it.
>
> --
> André Majorel 
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