At $Dayjob I have managed to with PCI passthrough pass in devices(GPU and IB) into a VM. But for some reason an all_reduce is still slow (1/10 with 2 full nodes in BM). First attempted layout was something like: upstream_port ^ downstream_port ^ ^ ^ ^ ^ GPU1 GPU2 GPU3 .. GPU8 IB1 IB2 IB3 …

In a previous post while preparing for RHCSA I installed kvm post-installation, via the GUI. But how to install, configure and use it only from the CLI? Virt-Manager http://virt-manager.org/page/Main_Page has some details As a test-machine I'm using a server with Scientific Linux 6.2 (with virtualization …

[toc] https://github.com/mconigliaro/RHCE-Cheat-Sheet Found this "cheat sheet" for RHCE. Sure it doesn't specifically say RHCSA but honestly there's a lot of good commands in there. Some things obviously might be too advanced for RHCSA, such configuring an dns/named service. But it might be good as a …