[CentOS] how do i have a clone centos server

[Les Mikesell]

John R Pierce wrote:
> Johnny Hughes wrote:
>> The easiest way to make that happen is to use a product called DRBD
> 
> do be aware, drbd replicas are not 'safe' for things like transactional 
> databases, unless they are configured to be synchronous (such that a 
> fsync doesn't return until its written on both the local disk AND the 
> replica), which slows everything way down.

If you can tolerate a small amount of downtime, a more simple-minded 
approach is to get servers with swappable drive carriers, set up your 
production servers with all partitions on raid1, and keep a spare 
similar chassis around.  Then if a single drive dies (the most likely 
failure), you just swap in a new one and resync the mirrors.   If the 
motherboard or power supply dies, you swap the drives into the spare and 
come up in the time it takes to reboot (you'll probably have to fix the 
NIC setup for the different hardware addresses, though.).

-- 
   Les Mikesell
    lesmikesell at gmail.com