This post explains how to obtain virtual or physical CPU usage of an Oracle VM Server, including actual CPU usage and running time of guest domains. Guest-specific (Dom-U) CPU usage can be obtained by running commands on the guest itself, for example; top, ps, and sar. If, however, you wish to obtain specific CPU usage, including that of the Oracle VM Server management domain/hypervisor (Dom-0), the following xen-tools utilities are available to run on the Oracle VM … [Read more...] about How to obtain virtual/physical CPU information in Oracle VM (XEN)
Oracle VM
How to detach/attach vNIC by Command Line in Oracle VM (x86)
Under some situation, we may need troubleshooting issue by detaching/attaching vNIC from the command line. The method described in this post is a feature of xm toolstack, so be careful while using it. Collect informations from the physical host server (dom0): # xm list Name ID Mem VCPUs State Time(s) Domain-0 0 922 4 r----- 290170.4 ovmm33x 1 6147 2 -b---- 171235.5 ### this is the VM we are going to detach/attach network, … [Read more...] about How to detach/attach vNIC by Command Line in Oracle VM (x86)
How to Get the Number of vCPUs that Oracle VM Guest can get in Oracle VM
On an x86-based system, a CPU core (no hyperthreading enabled) or a CPU thread (hyperthreading enabled) within a core is presented as a physical CPU by the hypervisor or the bare metal operating system. vCPUs (virtual CPUs) are exposed to the guest virtual machine as CPUs. The guest schedules applications on these vCPUs, and the hypervisor schedules these vCPUs over the physical CPU cores or threads. All vCPUs from a guest are symmetrical. Oracle VM Server treats these equally, as long as … [Read more...] about How to Get the Number of vCPUs that Oracle VM Guest can get in Oracle VM