![]() -hda myVirtualDisk.qcow2 → our 20GB variable-size disk.Let’s look at the meaning of each option: The following command meets these requirements: $ qemu-system-x86_64 \ Network card connected to the host via NAT.Virtual hard disk “ myVirtualDisk.qcow2“, previously created.Emulation of a Complete Hardware System With KVM Out of curiosity, “QCOW2 Image (v3)” refers to what was initially called QCOW3 and is sometimes still incorrectly called that on outdated web pages. rw-r-r- 1 francesco francesco 196928 Feb 3 19:31 myVirtualDisk.qcow2Īs expected, although it’s a 20GiB (21.474.836.480 bytes) virtual disk, its initially occupied space is only 192KiB (196.928 bytes). MyVirtualDisk.qcow2: QEMU QCOW2 Image (v3), 21474836480 bytes Let’s do a verification: $ file myVirtualDisk.qcow2 ![]() The virtual disk is ready with all the default options. Therefore, let’s create with qemu-img a variable-size QCOW2 disk of 20GB: $ qemu-img create -f qcow2 myVirtualDisk.qcow2 20Gįormatting 'myVirtualDisk.qcow2', fmt=qcow2 cluster_size=65536 extended_l2=off compression_type=zlib size=21474836480 lazy_refcounts=off refcount_bits=16 In the latter case, that is the default, the space occupied on the host grows as the virtual disk is used, which comes in handy when we don’t know how much space we need in advance. We can create a fixed-size (preallocated) or variable-size (non-preallocated) QCOW2 disk. In this example, we choose QCOW2, the QEMU’s native format, because it has several advantages over the other formats related to snapshots, space efficiency, compression, near-raw performance, multi-threading, error handling, memory usage, and encryption capabilities. ![]() Before proceeding further, let’s download the distro’s ISO. Let’s now see how to install Linux Mint 21.1 Cinnamon edition on a guest QEMU machine within a host running the same operating system.
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