In case you guys are curious. Jclouds supports the new cluster instances and placement groups. We should talk about how whirr can use this info.
Adrian -------- Original Message -------- Subject: RE: placement groups From: "Lipscomb, Trenton" <[email protected]> To: Adrian Cole <[email protected]> CC: null Sorry I missed a follow up on this. I haven't written up my trip report, and your question was buried in there. Apologies. I asked the principal engineer on HPC and here was his repose. We've also asked the PMs (who write the docs) to improve the explanations. Clustered placement groups are relegated to a single AZ, and that will be true forever. You can currently start more than one placement group in a single AZ, and we expect that to be common. Each group will independently experience the "clustering" benefits within the group, but not necessarily between groups even in the same AZ. As the placement group API evolves, it's possible that future strategies will straddle multiple AZs or even regions. Let me know if you need anything else. I hope, too, using the boot device flag helped you to keep track of which volumes go with which hosts. *trenton From: Adrian Cole [mailto:[email protected]] Sent: Friday, July 30, 2010 1:09 PM To: Lipscomb, Trenton Subject: placement groups Hi, Trenton, Thanks for chatting with me at length during oscon. Let me know, if you've found anything out about those new placement groups for the cluster instances. I'm working with cloudera and would like to understand the scope and usage correctly. Cheers, Adrian jclouds & opscode
