Let’s say the power supply on a node dies and I replace it. When the node starts up, does it have to get data from the other nodes or does it read from disk?


#1

by young » Sun Nov 11, 2012 11:29 pm


#2

You can actually choose. Depending on the reason for a node crash, you may find that one option or the other is better. For instance, if the problem was a bad disk, you may no longer have the data and will need to get a copy from the rest of the cluster. If the problem was a bad power supply, the data is still on disk and it is faster to read the data from disk than to transfer it from the other nodes.

If a node has been offline for a long time (more than a few hours), it is recommended not to read from disk. In this case, you should wipe the disk (using dd) before restarting the Aerospike server on the node.