Re: cluster hardware

Hi, Keith,

the data nodes in a cluster do not really need to be the same. The only requirement is that they have to have the same endianness. They can have different amounts of RAM, different CPU counts, hard drives, etc. But if the data nodes are different, the performance will be pretty much determined by the slowest node and the database size will be limited by the node with the least amount or RAM and/or with the smallest hard drive. It does not make much sense to use a powerful machine for a data node if another data node is slow, because you will get practically the same performance with two slow machines. Management node does not monitor the "speed" of data nodes, it actually does not distribute the load on data nodes at all. It is not how it is done in MySQL Cluster architecture.

Regards,
Anatoly.
> Being a newbie to clusters this might be a dumb question. I haven't seen it directly answered anywhere so I am going to venture out on a limb and ask...
>
> I understand that each data node in a cluster needs the same amount of RAM . However, how will different cpu counts/hard drive setups and such affect the performance. Not talking celeron vs/quad core, but some systems might have raid and four cores while some might not have raid and only have two cpus. Does the management node monitor things and distribute the nodes or should I try as hard as I can to have equal hardware on the boxes?
>
> thanks,
>
> Keith
>

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