Re: from 2x RAID1 to 1x RAID6 ?

[David Brown <david@westcontrol.com>]

On 09/06/2011 15:18, Nikolay Kichukov wrote:
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> On 06/08/2011 01:33 PM, David Brown wrote:
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>> So you install your RAID10 (or RAID6, if you prefer) system, and
>> make sure you keep backups.  And if you /do/ get hit by a double
>> disk failure in the wrong place, you spend the day restoring
>> everything from the backups.  When management complain that a 24
>> hour downtime doesn't fit with their 99.99% uptime expectations,
>> you remind them that this is amortized over the next 27 years...
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> Hi David,
>
> nice one ;-) Did you actually calculate 24 hours for those 99.99%
> within 27 years? ;-)
>

27.4 years is 10,000 days - so you can have 99.99% uptime with a 24-hour 
failure if you run for the rest of the 27.4 years without a hitch.  Of 
course, by the same logic you can claim 6 nine's uptime with a week's 
failure - as long as there are no more problems for the next 20,000 years...

:-)


> Cheers, - -Nik