Extend the size of a sparse image file (by adding some zeroes to it),
dd if=/dev/zero bs=1G count=10 >> suricat.img
Shutdown the guest, mount its fs and grow it, and bring it back,
xl shu suricat mkdir lala mount -o loop suricat.img lala df -hT xfs_growfs /data/guests/suricat/lala df -hT umount lala rmdir lala xl create suricat
Can I expand the size of a file based disk image? https://superuser.com/questions/693158/can-i-expand-the-size-of-a-file-based-disk-image
xl block-attach slackext4 tap:tapdisk:aio:/data/guests/slackext4/slackext4.data.ext4 xvdb1 w
How to dynamically attach a disk to running DomU in Xen? https://www.systutorials.com/how-to-dynamically-attach-a-disk-to-running-domu-in-xen/
Xen Disk Hot Add (Block Device) Howto https://backdrift.org/xen-disk-hot-add-block-device-howto