On 11/02/2019 17:03, Victor Sudakov wrote:
Dear Colleagues,
vm-bhyve keeps virtual machines on zfs volumes with volmode=dev. How can
I access/mount the filesystems within the volume when the virtual host
is offline?
If I kept virtual disks in raw files, I could access them as devices
with mdconfig. But:
root@newserv:~ # mdconfig -a -f /dev/zvol/zroot/vm/mail/disk0
mdconfig: /dev/zvol/zroot/vm/mail/disk0 is not a regular file
root@newserv:~ #
Also, how can I exchange those zfs volumes for use with other
hypervisors? They are not real raw disk files so I cannot use
sysutils/vmdktool etc.
I don't know this, but I'll guess(!)
If you've set volmode to dev then you get a cdev device in devfs, and
you'll never get it to mount. Try using geom instead (which IIRC is the
default).
HOWEVER, I suspect you're doing this because you're hoping that a ZFS
volume is faster than a file. I went through this, in the hope it
wouldn't do CoW and would therefore be a lot better for databases. I was
disappointed! Bascially, it's no better than a ZFS file. If that was
your plan, use a UFS partition. I don't use ZFS volumes any more; I
think they're more useful on Solaris. A md mapped on to a ZFS file seems
to be the BSD way, and for VMs just use a file in its own dataset. You
can then clone the dataset. Just what you need for nearly identical VMs.
Regards, Frank.
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