On 1/13/2012 11:17, Warp wrote:
>    One would think that if the server is mission-critical, it would have
> redundant hardware.

Or a trivial replacement system. Turn off the power, slide the disk drive 
out, slide it into the other case, turn the power on.

Otherwise you're in the Tandem Computing realm, where the system doesn't die 
for decades at a time, and occasionally a new board shows up via FedEx with 
instructions on which one to replace.  "Oh, and by the way, we upgraded your 
kernel without you noticing, while you were out."

>    And also I'm assuming this is not cheap, so management do not want.

Making something truly zero down-time is exceedingly expensive.

-- 
Darren New, San Diego CA, USA (PST)
   People tell me I am the counter-example.

Post a reply to this message