Date: Fri, 25 Mar 2022 07:33:54 -0600 From: "John Doherty" <bsdlists@jld3.net> To: freebsd-fs@freebsd.org Subject: create zpool from zvols? Message-ID: <72AA1AC8-E623-4B73-A3F3-3FDB0ABDFCEA@jld3.net>
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Hello, I am using ZFS on FreeBSD 13.0-RELEASE-p8. For experimentation
and demonstration, I would like to create zpools using zvols as the
underlying block devices.
For example, I have these:
[root@ibex] # zfs list -r -t volume zroot | grep zv
zroot/zv0 8.25G 832G 56K -
zroot/zv1 8.25G 832G 56K -
This seems as if it would do what I want:
[root@ibex] # zpool create -n ztest mirror /dev/zvol/zroot/zv{0,1}
would create 'ztest' with the following layout:
ztest
mirror
zvol/zroot/zv0
zvol/zroot/zv1
But when I try to actually do it, it doesn't work:
[root@ibex] # zpool create ztest mirror /dev/zvol/zroot/zv{0,1}
cannot create 'ztest': no such pool or dataset
FWIW, doing something similar on OmniOS works fine:
[root@orca] # uname -srvp
SunOS 5.11 omnios-r151040-852962cae3 i386
[root@orca] # zfs create -V 2G rpool/zv0
[root@orca] # zfs create -V 2G rpool/zv1
[root@orca] # zpool create ztest mirror /dev/zvol/dsk/rpool/zv{0,1}
[root@orca] # zpool status ztest
pool: ztest
state: ONLINE
scan: none requested
config:
NAME STATE READ WRITE CKSUM
ztest ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
/dev/zvol/dsk/rpool/zv0 ONLINE 0 0 0
/dev/zvol/dsk/rpool/zv1 ONLINE 0 0 0
errors: No known data errors
I thought I had done this in the past. Am I doing something wrong? Am I
misremembering and this never worked?
Using files created with truncate(1) rather zvols seems to work fine so
maybe that's what I did before. Not sure, it's been a long time since I
wanted to do something like this.
Thanks for any enlightenment.
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