Difference between revisions of "Qemu-img info"
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| − | <code> | + | {{lowercase}} |
| + | <code>qemu-img info YOUR_FILENAME</code> give information about the disk image (YOUR_FILENAME) | ||
| + | * https://manpages.debian.org/testing/qemu-utils/qemu-img.1.en.html#OPTIONS | ||
| + | |||
| + | == Options == | ||
| + | --backing-chain If a disk image has a backing file chain will enumerate information about [[backing files]] in a [[disk image]] chain | ||
| + | |||
| + | == Examples == | ||
| + | |||
| + | $ qemu-img info test.vmdk | ||
| + | (VMDK) image open: flags=0x2 filename=test.vmdk | ||
| + | image: test.vmdk | ||
| + | file format: vmdk | ||
| + | [[virtual size]]: 20M (20971520 bytes) | ||
| + | disk size: 17M | ||
| + | |||
| + | |||
| + | qemu-img info root_default.img | ||
| + | image: root_default.img | ||
| + | file format: qcow2 | ||
| + | virtual size: 41 GiB (44023414784 bytes) | ||
| + | disk size: 1.14 GiB | ||
| + | cluster_size: 65536 | ||
| + | [[backing file]]: [[/var/lib/libvirt/images/]]fedora-VAGRANTSLASH-32-cloud-base_vagrant_box_image_32.20200422.0.img | ||
| + | backing file format: qcow2 | ||
| + | Format specific information: | ||
| + | compat: 0.10 | ||
| + | refcount bits: 16 | ||
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<pre> | <pre> | ||
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corrupt: false | corrupt: false | ||
</pre> | </pre> | ||
| + | |||
| + | qemu-img info MY_image-qcow.qcow2 | ||
| + | image: MY_image-qcow.qcow2 | ||
| + | file format: qcow2 | ||
| + | virtual size: 250G (268435456000 bytes) | ||
| + | disk size: 250G | ||
| + | cluster_size: 65536 | ||
| + | Format specific information: | ||
| + | compat: 1.1 | ||
| + | lazy refcounts: true | ||
| + | refcount bits: 16 | ||
| + | corrupt: false | ||
| + | |||
| + | <pre> | ||
| + | $ qemu-img info --backing-chain MY_image-qcow.qcow2 | ||
| + | image: MY_image-qcow.qcow2 | ||
| + | file format: qcow2 | ||
| + | virtual size: 20G (21474836480 bytes) | ||
| + | disk size: 7.5G | ||
| + | cluster_size: 65536 | ||
| + | Format specific information: | ||
| + | compat: 1.1 | ||
| + | lazy refcounts: true | ||
| + | refcount bits: 16 | ||
| + | corrupt: false | ||
| + | </pre> | ||
| + | |||
| + | |||
| + | qemu-img info IMAGE.qcow2 | ||
| + | qemu-img: Could not open 'IMAGE.qcow2': Failed to get shared "write" lock | ||
| + | Is another process using the image? | ||
| + | |||
Notes: | Notes: | ||
* Encrypted information will be available only if the image is encrypted (The use of encryption in qcow and qcow2 images is considered to be flawed by modern cryptography standards) | * Encrypted information will be available only if the image is encrypted (The use of encryption in qcow and qcow2 images is considered to be flawed by modern cryptography standards) | ||
* Snapshot list: A list of all internal snapshots | * Snapshot list: A list of all internal snapshots | ||
| + | |||
| + | == Related commands == | ||
| + | * <code>[[qemu-img resize]]</code> | ||
| + | * <code>[[qemu-img convert]]</code> | ||
| + | * <code>[[qemu-img check]]</code> | ||
== See also == | == See also == | ||
* {{QEMU}} | * {{QEMU}} | ||
| − | + | * {{virt}} | |
| + | * [[Filesystems]]: [[lazy allocation]], [[speculative preallocation]] ([[XFS]]) | ||
[[Category:Linux]] | [[Category:Linux]] | ||
[[Category:KVM]] | [[Category:KVM]] | ||
Latest revision as of 15:23, 3 October 2021
qemu-img info YOUR_FILENAME give information about the disk image (YOUR_FILENAME)
Contents
Options[edit]
--backing-chain If a disk image has a backing file chain will enumerate information about backing files in a disk image chain
Examples[edit]
$ qemu-img info test.vmdk (VMDK) image open: flags=0x2 filename=test.vmdk image: test.vmdk file format: vmdk virtual size: 20M (20971520 bytes) disk size: 17M
qemu-img info root_default.img image: root_default.img file format: qcow2 virtual size: 41 GiB (44023414784 bytes) disk size: 1.14 GiB cluster_size: 65536 backing file: /var/lib/libvirt/images/fedora-VAGRANTSLASH-32-cloud-base_vagrant_box_image_32.20200422.0.img backing file format: qcow2 Format specific information: compat: 0.10 refcount bits: 16
$ qemu-img info image-qcow.qcow2 image: image-qcow.qcow2 file format: qcow2 virtual size: 10G (10737418240 bytes) disk size: 136K cluster_size: 65536
$ qemu-img info MY_image-qcow.qcow2
image: MY_image-qcow.qcow2
file format: qcow2
virtual size: 20G (21474836480 bytes)
disk size: 7.5G
cluster_size: 65536
Format specific information:
compat: 1.1
lazy refcounts: true
refcount bits: 16
corrupt: false
qemu-img info MY_image-qcow.qcow2 image: MY_image-qcow.qcow2 file format: qcow2 virtual size: 250G (268435456000 bytes) disk size: 250G cluster_size: 65536 Format specific information: compat: 1.1 lazy refcounts: true refcount bits: 16 corrupt: false
$ qemu-img info --backing-chain MY_image-qcow.qcow2
image: MY_image-qcow.qcow2
file format: qcow2
virtual size: 20G (21474836480 bytes)
disk size: 7.5G
cluster_size: 65536
Format specific information:
compat: 1.1
lazy refcounts: true
refcount bits: 16
corrupt: false
qemu-img info IMAGE.qcow2 qemu-img: Could not open 'IMAGE.qcow2': Failed to get shared "write" lock Is another process using the image?
Notes:
- Encrypted information will be available only if the image is encrypted (The use of encryption in qcow and qcow2 images is considered to be flawed by modern cryptography standards)
- Snapshot list: A list of all internal snapshots
Related commands[edit]
See also[edit]
- QEMU:
qemu-img,qemu-ga,qemu.conf,virsh qemu, QEMU guest agent (qemu-ga), qcow2,qemu-nbd, qemu-img map,qemu-io,/etc/libvirt/qemu.conf, QEMU releases, VENOM,qemu-nbd --help, qemu-system libguestfs-tools:virt-sysprep,virt-clone,virt-builder,virt-customize,virt-resize,virt-rescue,virt-sparsify,guestmount,guestfish,virt-inspector,virt-cat,virt-log,virt-df,virt-ls,virt-filesystems,virt-list-filesystems,virt-edit- Filesystems: lazy allocation, speculative preallocation (XFS)
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