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qcow is a file format for disk image files used by QEMU, a hosted virtual machine monitor. [1] It stands for "QEMU Copy On Write" and uses a disk storage optimization strategy that delays allocation of storage until it is actually needed.
The Quick Emulator (QEMU) [3] is a free and open-source emulator that uses dynamic binary translation to emulate a computer's processor; that is, it translates the emulated binary codes to an equivalent binary format which is executed by the machine.
In Windows Vista and later versions of Windows, the relocation of DLLs and executables is done by the kernel memory manager, which shares the relocated binaries across multiple processes. Images are always relocated from their preferred base addresses, achieving address space layout randomization (ASLR).
Windows 8, 8.1, 10, and Windows Server 2012 w/Hyper-V role, Microsoft Hyper-V Server Supported drivers for Windows NT, FreeBSD, Linux (SUSE 10, RHEL 6, CentOS 6) Proprietary. Component of various Windows editions. INTEGRITY: Green Hills Software: ARM, x86, PowerPC Same as host Linux, Windows
The QEMU maintainers merged support for providing SPICE remote desktop capabilities for all QEMU virtual machines in March 2010. The QEMU binary links to the spice-server library to provide this capability and implements the QXL paravirtualized framebuffer device to enable the guest OS to take advantage of the performance benefits the SPICE ...
Usually the pre-copy phase ends when the number of dirtied pages remaining becomes small enough to yield a short stop-and-copy phase. However, if a VM keeps dirtying memory faster than can be re-copied to the destination, then pre-copy phase will end after a set time limit or maximum number of pre-copy rounds to begin the next stop-and-copy phase.
TIFF/EP, TIF, TIFF – Tag Image File Format / Electronic Photography, ISO 12234-2; tends to be used as a basis for other formats rather than in its own right. VTF – Valve Texture Format; WEBP – WebP, an image format designed for the web that can provide both lossless and lossy compression. XBM – X Window System Bitmap
In computing, a system image is a serialized copy of the entire state of a computer system stored in some non-volatile form, such as a binary executable file. If a system has all its state written to a disk (i.e. on a disk image ), then a system image can be produced by copying the disk to a file elsewhere, often with disk cloning applications.