Date: Sun, 21 Apr 2019 17:01:55 +0000 From: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> To: "FreeBSD virtualization mailing list" <freebsd-virtualization@freebsd.org> Subject: bhyve, sparse disk image and trim support? Message-ID: <21E25588-ADC0-4101-B122-5782D9A94AC4@lists.zabbadoz.net>
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Hi, I have been wondering about this with other (commercial) virtualisation solutions in the past. If running on a “disk image” ideally I’d love that image to be a sparse file and ideally I’d love for bhyve/underlying virtualisation for the disk to understand TRIM so in case one deletes huge junks inside the VM the disk image can actually shrink again. Examples might be: you do a buildworld or an OS update in the guest and then want to delete the obj tree or temporary files after that. Now the disk image on the host has been bloated up, and could massively shrink again saving space on the host. Do we support this? Has anyone worked on this? How do people deal with these problems? /bz
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