14.5.17. Using blockresize to Change the Size of a Domain Path

download PDF
blockresize can be used to re-size a block device of a domain while the domain is running, using the absolute path of the block device which also corresponds to a unique target name (<target dev="name"/>) or source file (<source file="name"/>). This can be applied to one of the disk devices attached to domain (you can use the command domblklist to print a table showing the brief information of all block devices associated with a given domain).


Live image re-sizing will always re-size the image, but may not immediately be picked up by guests. With recent guest kernels, the size of virtio-blk devices is automatically updated (older kernels require a guest reboot). With SCSI devices, it is required to manually trigger a re-scan in the guest with the command, echo > /sys/class/scsi_device/0:0:0:0/device/rescan. In addition, with IDE it is required to reboot the guest before it picks up the new size.
  • Run the following command: blockresize [domain] [path size] where:
    • Domain is the unique target name or source file of the domain whose size you want to change
    • Path size is a scaled integer which defaults to KiB (blocks of 1024 bytes) if there is no suffix. You must use a suffix of "B" to for bytes.
Red Hat logoGithubRedditYoutubeTwitter


Try, buy, & sell


About Red Hat Documentation

We help Red Hat users innovate and achieve their goals with our products and services with content they can trust.

Making open source more inclusive

Red Hat is committed to replacing problematic language in our code, documentation, and web properties. For more details, see the Red Hat Blog.

About Red Hat

We deliver hardened solutions that make it easier for enterprises to work across platforms and environments, from the core datacenter to the network edge.

© 2024 Red Hat, Inc.