Contents 9.14 Configuring the VirtualBox CoreDumper on Solaris hosts . . . . . . . . . . . . . 150 9.15 Locking down the VirtualBox manager GUI . . . . . . . . . . . . . . . . . . . . . 151 9.16 Starting the VirtualBox web service automatically . . . . . . . . . . . . . . . . . 152 10 Technical background 153 10.1 Where VirtualBox stores its files . . . . . . . . . . . . . . . . . . . . . . . . . . . 153 10.1.1 Machines created by VirtualBox version 4.0 or later . . . . . . . . . . . 153 10.1.2 Machines created by VirtualBox versions before 4.0 . . . . . . . . . . . 154 10.1.3 Global configuration data . . . . . . . . . . . . . . . . . . . . . . . . . . 154 10.1.4 Summary of 4.0 configuration changes . . . . . . . . . . . . . . . . . . 155 10.1.5 VirtualBox XML files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155 10.2 VirtualBox executables and components . . . . . . . . . . . . . . . . . . . . . . 155 10.3 Hardware vs. software virtualization . . . . . . . . . . . . . . . . . . . . . . . . 157 10.4 Details about software virtualization . . . . . . . . . . . . . . . . . . . . . . . . 158 10.5 Details about hardware virtualization . . . . . . . . . . . . . . . . . . . . . . . . 160 10.6 Nested paging and VPIDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161 11 VirtualBox programming interfaces 163 12 Troubleshooting 164 12.1 Procedures and tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164 12.1.1 Categorizing and isolating problems . . . . . . . . . . . . . . . . . . . . 164 12.1.2 Collecting debugging information . . . . . . . . . . . . . . . . . . . . . 165 12.1.3 The built-in VM debugger . . . . . . . . . . . . . . . . . . . . . . . . . . 165 12.1.4 VM core format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167 12.2 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168 12.2.1 Guest shows IDE/SATA errors for file-based images on slow host file system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168 12.2.2 Responding to guest IDE/SATA flush requests . . . . . . . . . . . . . . . 169 12.2.3 Poor performance caused by host power management . . . . . . . . . . 169 12.2.4 GUI: 2D Video Acceleration option is grayed out . . . . . . . . . . . . . 169 12.3 Windows guests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170 12.3.1 Windows bluescreens after changing VM configuration . . . . . . . . . 170 12.3.2 Windows 0x101 bluescreens with SMP enabled (IPI timeout) . . . . . . 170 12.3.3 Windows 2000 installation failures . . . . . . . . . . . . . . . . . . . . 170 12.3.4 How to record bluescreen information from Windows guests . . . . . . 171 12.3.5 No networking in Windows Vista guests . . . . . . . . . . . . . . . . . . 171 12.3.6 Windows guests may cause a high CPU load . . . . . . . . . . . . . . . 171 12.3.7 Long delays when accessing shared folders . . . . . . . . . . . . . . . . 171 12.4 Linux and X11 guests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171 12.4.1 Linux guests may cause a high CPU load . . . . . . . . . . . . . . . . . 171 12.4.2 AMD Barcelona CPUs . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172 12.4.3 Buggy Linux 2.6 kernel versions . . . . . . . . . . . . . . . . . . . . . . 172 12.4.4 Shared clipboard, auto-resizing and seamless desktop in X11 guests . . 172 12.5 Windows hosts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172 12.5.1 VBoxSVC out-of-process COM server issues . . . . . . . . . . . . . . . . 172 12.5.2 CD/DVD changes not recognized . . . . . . . . . . . . . . . . . . . . . . 173 12.5.3 Sluggish response when using Microsoft RDP client . . . . . . . . . . . 173 12.5.4 Running an iSCSI initiator and target on a single system . . . . . . . . . 173 12.5.5 Bridged networking adapters missing . . . . . . . . . . . . . . . . . . . 174 12.5.6 Host-only networking adapters cannot be created . . . . . . . . . . . . 174 12.6 Linux hosts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174 12.6.1 Linux kernel module refuses to load . . . . . . . . . . . . . . . . . . . . 174 12.6.2 Linux host CD/DVD drive not found . . . . . . . . . . . . . . . . . . . . 174 6