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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.
QEMU integrates several services to allow the host and guest systems to communicate for example: an integrated SMB server and network-port redirection (to allow incoming connections to the virtual machine). It can also boot Linux kernels without a bootloader. QEMU does not depend on the presence of graphical output methods on the host system.
The file size of a raw disk image is always a multiple of the sector size. For floppy disks and hard drives this size is typically 512 bytes (but other sizes such as 128 and 1024 exist). More precisely, the file size of a raw disk image of a magnetic disk corresponds to: Cylinders × Heads × (Sectors per track) × (Sector size)
Name Creates [a] Modifies? [b]Mounts? [c]Writes/ Burns? [d]Extracts? [e]Input format [f] Output format [g] OS License; 7-Zip: Yes: No: No: No: Yes: CramFS, DMG, FAT ...
A flat image allocates space ahead of time while a sparse image grows as the virtual machine writes to it. Flat images can use the underlying file system's sparse file capability, as is done with the vmfs format on ESXi. An image can also refer to a parent image and only store changes made in a copy-on-write fashion. This enables creating a ...
EXIF – Exchangeable image file format (Exif) is a specification for the image format used by digital cameras GIF – CompuServe 's Graphics Interchange Format GIFV – Graphics Interchange Format Video, a format used for short, looping videos that combines the advantages of GIFs and videos, with better playback quality and lower file sizes [ 14 ]
Maximum disk size per VM guest Containers, or Zones: No theoretical limit (largest SPARC has 384 physical cores) 32 TB (largest SPARC) No limit 8191 No limit No limit No limit No limit VMware Player 15.0 [41] No limit No limit No limit No limit 16 4 GB (32-bit); 64 GB (64-bit) ? 8 TB VMware vSphere Hypervisor (ESXi 4.1) [42] 160 logical cores 1 TB
A hardware page table walker can treat the additional translation layer almost like adding levels to the page table. Using SLAT and multilevel page tables, the number of levels needed to be walked to find the translation doubles when the guest-physical address is the same size as the guest-virtual address and the same size pages are used.