What Are the Differences Between Image Formats on HUAWEI CLOUD Stack?

olive.zhao · Created Feb 26, 2022 09:02:46

Hello, friend!

Q1. Which image formats does HUAWEI CLOUD Stack support?

Currently only supports mirror registration in VMDK, VHD, QCOW2, ZVHD, and ZVHD2 formats.

Image Format	Description
ZVHD	This is a self-developed format. It uses the zlib compression algorithm and supports sequential read and write.
ZVHD2	This is a self-developed format. It uses the Zstandard (or zstd) algorithm and supports lazy loading.
QCOW2	QCOW2 is a format of disk images supported by the QEMU simulator. A QCOW2 image file is used to represent a block device disk with a fixed size. Compared with a RAW image, a QCOW2 image has the following features: Occupies less disk space. Supports Copy-On-Write (COW). The image file only represents changes made to an underlying disk. Supports snapshots. Supports zlib compression and AES encryption. AES stands for Advanced Encryption Standard.
VMDK	VMDK is a virtual disk format created by VMware. A VMDK file represents a physical disk drive of the virtual machine file system (VMFS) on an ECS.
VHD	VHD is a virtual disk file format provided by Microsoft. The VHD file format can be compressed into a single file and stored in the file system of the host. It mainly contains a file system required for starting ECSs.

Hope this helps!

olive.zhao · Created Feb 26, 2022 09:02:46

Hello, friend!

Currently only supports mirror registration in VMDK, VHD, QCOW2, ZVHD, and ZVHD2 formats.

Image Format	Description
ZVHD	This is a self-developed format. It uses the zlib compression algorithm and supports sequential read and write.
ZVHD2	This is a self-developed format. It uses the Zstandard (or zstd) algorithm and supports lazy loading.
QCOW2	QCOW2 is a format of disk images supported by the QEMU simulator. A QCOW2 image file is used to represent a block device disk with a fixed size. Compared with a RAW image, a QCOW2 image has the following features: Occupies less disk space. Supports Copy-On-Write (COW). The image file only represents changes made to an underlying disk. Supports snapshots. Supports zlib compression and AES encryption. AES stands for Advanced Encryption Standard.
VMDK	VMDK is a virtual disk format created by VMware. A VMDK file represents a physical disk drive of the virtual machine file system (VMFS) on an ECS.
VHD	VHD is a virtual disk file format provided by Microsoft. The VHD file format can be compressed into a single file and stored in the file system of the host. It mainly contains a file system required for starting ECSs.

Hope this helps!