Absolutely agree that there are many other factors beyond MarkLogic- network, disk, support, rack space, etc. This is good feedback. From what you're saying, essentially the overhead of more nodes is on the inter-node communication and managing more nodes, but MarkLogic itself won't see much difference beyond having fewer nodes to talk to.
On Wed, Jun 29, 2011 at 2:03 PM, Danny Sokolsky < [email protected]> wrote: > Hi Harry,**** > > ** ** > > Given the example you gave, I would give a slight advantage to the fewer > larger systems. Others might have a different opinion. Also, in your > example, your 2-node setup has more total cores and more total memory, so > that adds to its advantage. These kinds of things are always tradeoffs, > though, so I would think about the factors in the tradeoffs and your > situation and go from there.**** > > ** ** > > For resources, think about cores, memory, and disk I/O capacity (disk I/O > is less of a factor for e-node hosts). Network capacity can also be a > factor.**** > > ** ** > > While MarkLogic scales very well, there is some overhead in a cluster to > adding more hosts, as each host has to communicate with each other host. > Most of the time this will not be terribly significant, particularly with > moderate sized clusters, but it does put more demands on your network. More > hosts also gives you that many more machines to manage, which can be a > factor. It also gives you some more levers for load balancing (which might > be good or not, depending on the complexity of your environment).**** > > ** ** > > That is the way I would begin to think about it.**** > > ** ** > > -Danny**** > > ** ** > > *From:* [email protected] [mailto: > [email protected]] *On Behalf Of *Harry Bakken > *Sent:* Wednesday, June 29, 2011 12:27 PM > *To:* General MarkLogic Developer Discussion > *Subject:* [MarkLogic Dev General] E Node Cluster Question**** > > ** ** > > I am wondering if anyone can provide real world experience-based advice on > clustering E nodes. Is it better for system performance to run with fewer > beefy nodes or more not-so-beefy nodes? For example, would it be better to > have:**** > > - two E Nodes built on 24 cores and 78 GB of RAM > or > - five E nodes with 8 cores and 16 GB of RAM**** > > > Any insight or examples is appreciated. We have some internal info from > other projects that give us some direction, but I am interested to know what > others are doing and how MarkLogic is engineered for clustering. Is there a > performance hit for more nodes? Does it really matter? Is it more a question > of how much load there is to balance and hardware budget than system > performance considerations? > > Thank you in advance, > Harry > > **** > > _______________________________________________ > General mailing list > [email protected] > http://developer.marklogic.com/mailman/listinfo/general > >
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