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Re: Legacy ZFS mounts

Since yesterday I don't get my zfs fule systems automatically mounted,
I have to issue 'zfs mount -a'.

Should I add some entry in /etc/fstab or place the above command in
one of the scripts?

The zvols are accessible as usual.

On Sat, 7 Sep 2019 at 14:54, Brad Spencer <> wrote:
> writes:
> [snip]
> >> The module has to load before zvols will show up and if that is ALL you
> >> were doing, I don't think anything else will prompt the loading of the
> >> module.  That is, your /dev/zvol/* tree would not be there unless you
> >> execute the zfs (and probably the zpool) command prior to trying to use
> >> your devices (I think that it is the opening and use of /dev/zfs that
> >> does prompt the module load, but that isn't needed for pure zvol
> >> access).
> >
> > Would it make sense to make mount_zfs do that?
> The prompting of the module load would happen with mount_zfs for the ZFS
> filesystem/dataset case, so in that case you are very correct that a
> additional poke is not needed, but mount_zfs is not use when just
> accessing zvol devices.  In fact, nothing is needed for raw zvol use,
> except the loading of the module.
> By example, lets suppose you are using LVM devices as back store to DOMU
> guests.  You still have to do a /sbin/vgscan to get the devices created
> even if you are not going to use the logical volumes for anything else
> but back store.  This might, have not actually looked, prompt the load
> of the device manager module hence our /etc/rc.d/lvm script (among other
> uses, of course, in this case).  In the ZFS zvol case, it would be the
> same thing except that all that is needed is that the module load.  The
> /etc/rc.d/zfs script I propose just does a "zfs list" (and checks the
> return code, as it is possible that /dev/zfs is missing or there were
> other errors and reports this...  it is also possible to build a system
> without ZFS built, we have a make variable for that, and if you happen
> to do a zfs=YES we should not be dumb about that) which is what was
> already present in /etc/rc.d/mountall.  I simply moved it sooner in the
> boot process and made it more literal and intentional with the variable
> as I wanted to use zvol devices before mountall ran.  I would also need
> to do something to get the module loaded if I was going to present zvols
> to DOMU (as I do intend to do some day) but did not use a ZFS
> filesystem/dataset for anything in the DOM0.
> To cover the various cases, I don't see how one gets all the bits and
> pieces in place in really any other manor.  As I said, this is all done
> more or less in this way for raidframe and LVM.
> --
> Brad Spencer - - KC8VKS -


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