By default QEMU doesn't report any rotation information to guests, so guests assume rotational media. This lets the user specify an explicit speed in RPM, or 1 for SSD. This may allow the user to achieve better performance for their virtual disks. Note, however, this doesn't mean that the guest should be given the same setting as the host storage. It is possible that better performance may be achieved with contrary settings from the host. Testing is required to determine this on a case by case basis. Daniel P. Berrangé (2): conf: add support for disk "rotation_rate" property qemu: implement setting of rotation rate for SCSI/IDE disks docs/formatdomain.rst | 13 ++++- docs/schemas/domaincommon.rng | 5 ++ src/conf/domain_conf.c | 11 ++++ src/conf/domain_conf.h | 1 + src/qemu/qemu_capabilities.c | 2 + src/qemu/qemu_capabilities.h | 1 + src/qemu/qemu_command.c | 3 + src/qemu/qemu_validate.c | 22 ++++++++ .../caps_2.12.0.aarch64.xml | 1 + .../caps_4.0.0.aarch64.xml | 1 + .../qemucapabilitiesdata/caps_4.0.0.ppc64.xml | 1 + .../caps_4.0.0.riscv32.xml | 1 + .../caps_4.0.0.riscv64.xml | 1 + .../qemucapabilitiesdata/caps_4.0.0.s390x.xml | 1 + .../caps_4.0.0.x86_64.xml | 1 + .../caps_4.1.0.x86_64.xml | 1 + .../caps_4.2.0.aarch64.xml | 1 + .../qemucapabilitiesdata/caps_4.2.0.ppc64.xml | 1 + .../qemucapabilitiesdata/caps_4.2.0.s390x.xml | 1 + .../caps_4.2.0.x86_64.xml | 1 + .../caps_5.0.0.aarch64.xml | 1 + .../qemucapabilitiesdata/caps_5.0.0.ppc64.xml | 1 + .../caps_5.0.0.riscv64.xml | 1 + .../caps_5.0.0.x86_64.xml | 1 + .../qemucapabilitiesdata/caps_5.1.0.sparc.xml | 1 + .../caps_5.1.0.x86_64.xml | 1 + .../caps_5.2.0.aarch64.xml | 1 + .../qemucapabilitiesdata/caps_5.2.0.ppc64.xml | 1 + .../caps_5.2.0.riscv64.xml | 1 + .../qemucapabilitiesdata/caps_5.2.0.s390x.xml | 1 + .../caps_5.2.0.x86_64.xml | 1 + .../caps_6.0.0.x86_64.xml | 1 + .../disk-rotation.x86_64-latest.args | 56 +++++++++++++++++++ tests/qemuxml2argvdata/disk-rotation.xml | 38 +++++++++++++ tests/qemuxml2argvtest.c | 1 + .../disk-rotation.x86_64-latest.xml | 55 ++++++++++++++++++ tests/qemuxml2xmltest.c | 1 + 37 files changed, 230 insertions(+), 3 deletions(-) create mode 100644 tests/qemuxml2argvdata/disk-rotation.x86_64-latest.args create mode 100644 tests/qemuxml2argvdata/disk-rotation.xml create mode 100644 tests/qemuxml2xmloutdata/disk-rotation.x86_64-latest.xml -- 2.30.2
