raw vs. QCOW2ΒΆGlance supports a variety of image formats; however raw
and QCOW2 are the most common. While QCOW2 does provide
some benefits (supports copy-on-write, snapshots, dynamic expansion)
over the raw format, it should be noted that when images
are copied into Cinder volumes, they are converted into the raw
format once stored on an ONTAP backend.
Note
Use of the QCOW2 image format is recommended for ephemeral disks
due to its inherent benefits when taking instance snapshots. Use of
Note
Use of the raw image format are recommended for persistent
boot disks.
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