Bezüglich Harry Schmalzbauer's Nachricht vom 15.10.2017 11:33 (localtime): > Hello, > > maybe I'm just missing something obvious, but modifying a dataset's > volmode property seems to force me to reboot the host to have any effect. > > Test to reproduce (parent dataset hostPsys/bhyveVOL/sys has volmode set > ot "dev"): > > 1.) Create new volume with volmode=geom, and write new GPT > > zfs create -o volmode=geom -V 10G hostPsys/bhyveVOL/sys/test > gpart create -s gpt /dev/zvol/hostPsys/bhyveVOL/sys/test > gpart show -l /dev/zvol/hostPsys/bhyveVOL/sys/test > => 40 20971440 zvol/hostPsys/bhyveVOL/sys/test GPT > (10G) > 40 20971440 - free - (10G) > > (works as expected) > > 2.) Create new volume with volmode=dev, and write new GPT > > zfs destroy hostPsys/bhyveVOL/sys/test > zfs create -V 10G hostPsys/bhyveVOL/sys/test > gpart create -s gpt > /dev/zvol/hostPsys/bhyveVOL/sys/test > > > gpart: arg0 'zvol/hostPsys/bhyveVOL/sys/test': Invalid argument > > (fails as expected) > > 3.) Modify existing volmode=dev dataset and write new GPT > > zfs set volmode=geom > hostPsys/bhyveVOL/sys/test > > > zfs get volmode > hostPsys/bhyveVOL/sys/test > > > NAME PROPERTY VALUE > SOURCE > > > hostPsys/bhyveVOL/sys/test volmode geom local > gpart create -s gpt > /dev/zvol/hostPsys/bhyveVOL/sys/test > > > gpart: arg0 'zvol/hostPsys/bhyveVOL/sys/test': Invalid argument > > (fails unexpected) > > What can I do to let geom(4) know that there's a new device?
Device should read provider. I found that last sentence in the zfs(8) man page, describing the volmode property: »This property can be changed any time, but so far it is processed only during volume creation and pool import.« So it seems to be a limitation by design. re-importing the pool is no option for me, so I'll keep in mind that changing volmode means outage. I'm aware that I can utilize ctl(8) to get access to a volmode=dev volume, also md(4) might help in that case, but for changing volmode=geom a reboot / re-import was required. I guess the benefit of extending the implementation design is much to small to justify the effort. But I think making "volmode" a creation-only property (like utf8only) should be considered. Thanks, -harry _______________________________________________ freebsd-stable@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"
