redundant DHCP servers

HI. I searched the forum but didnt find any answer to my question, so here it goes: I need to get a DHCP-Server redundant. Everybody tells me to put each server in a subnet, but it isnt an option, as I need to keep as many IPs as possible, and with the splitting, I lose 50% of the IPs.

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HI. I searched the forum but didnt find any answer to my question, so here it goes:
I need to get a DHCP-Server redundant. Everybody tells me to put each server in a subnet, but it isnt an option, as I need to keep as many IPs as possible, and with the splitting, I lose 50% of the IPs.
My idea was the following: get Heartbeat to check if the DHCP-Service is running. If the service is not running, switch on the DHCP-service on another machine. The directory, which stores the IPs, will be synct with Rsync every so and so seconds/minutes.
 
Will this work? how do I configure Heartbeat to check for the DHCP service?
 
Thx

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