Quoth Ron Mayer <[EMAIL PROTECTED]>: > Merlin Moncure wrote: >> ...You need to build a bigger, faster box with lots of storage... >> Clustering ... B: will cost you more, not less > > > Is this still true when you get to 5-way or 17-way systems? > > My (somewhat outdated) impression is that up to about 4-way systems > they're price competitive; but beyond that, I thought multiple cheap > servers scales much more afordably than large servers. Certainly > at the point of a 129-CPU system I bet you're better off with a > network of cheap servers.
Not necessarily. If you have 129 boxes that you're trying to keep synced, it is likely that the cost of syncing them will be greater than the other write load. If the problem being addressed is that a 4-way box won't handle the transaction load, it is unlikely that building a cluster of _smaller_ machines will help terribly much. The reason to "cluster" in the context of a transactional system is that you need improved _reliability_. Since communications between servers is _thousands_ of times slower than communicating with local memory, you have to be willing to live with an ENORMOUS degradation of performance when hosts are synchronized. And if "real estate" has a cost, where you have to pay for rack space, having _fewer_ machines is preferable to having more. -- output = ("cbbrowne" "@" "gmail.com") http://www.ntlug.org/~cbbrowne/postgresql.html If con is the opposite of pro, is Congress the opposite of progress? ---------------------------(end of broadcast)--------------------------- TIP 4: Don't 'kill -9' the postmaster