1/12/2024 0 Comments Qemu system x86 64![]() This is safe as long as your guest OS makes sure toĬorrectly flush disk caches where needed. Writes as completed as soon as the data is present in the host pageĬache. “unmap” if discard is set to “unmap” to allow a zero write toīy default, the cache=writeback mode is used. Guest write attempts will fail.Ĭopy-on-read is “on” or “off” and enables whether to copy readīacking file sectors into the image file.ĭetect-zeroes is “off”, “on” or “unmap” and enables theĪutomatic conversion of plain zero writes by the OS to driver Specify the controller’s PCI address (if=virtio only). This option specifies the serial number to assign to the Can be used to specifiy format=raw to avoid Specify which disk format will be used rather than detecting Try native.ĭiscard is one of “ignore” (or “off”) or “unmap” (or “on”) andĬontrols whether discard (also known as trim or unmap) requestsĪre ignored or passed to the filesystem. More explanations on cache settings below.Īio is “threads”, or “native” and selects between pthread basedĭisk I/O and native Linux AIO. Use none or writeback and see which performs better. “writethrough” and controls how the host cache is used toĪccess block data. ![]() Default is disk.Ĭache is “none”, “writeback”, “unsafe”, “directsync” or This option defines the type of the media: disk or cdrom. Index in the list of available connectors of a given interface This option defines where the drive is connected by using an These options define where the drive is connected by defining Available types are: ide, scsi, sd, mtd, floppy, This option defines to which type of interface the drive isĬonnected. This option defines which disk image to use with this drive. If you want to get good read and write performance, see the recommendations on drive configuration under Tuning VM Disk Performance. The -drive options listed below are based on the old syntax. For the syntax of your current qemu version, change the branch from “Master” to your qemu release.) Recommendations For -device and -drive options, see qdev-device-use.txt. (Note: The latest qemu syntax can also be found here. Please refer to the qemu documentation at – look for the version you got and select the corresponding sub-folder. The options below are valid for qemu-system-x86_64 version 2.5.0. You can get the complete man page by entering the following in a terminal window: In an attempt to make the qemu -drive command line options more accessible, here is an extract from the qemu-system-x86_64 man page.
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