On 09/06/2011 15:18, Nikolay Kichukov wrote:
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On 06/08/2011 01:33 PM, David Brown wrote:
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...
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
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