[zfs-discuss] best practice to pass zfs volume to qemu/kvm

thibaut noah thibaut.noah at gmail.com
Mon Feb 15 18:02:25 EST 2016


The problem here is i don't have any zvol, nor the place to create one the
size of my dataset, basically i have a 6tB dataset with only 220g
available, will i have to destroy it and copy/paste all the datas again ? :/

2016-02-16 0:00 GMT+01:00 Alex Braunegg <alex.braunegg at gmail.com>:

> When I create a zvol to pass to Xen I use the following:
>
>
>
> /sbin/zfs create -s -b 128K -V <size>
> <pool_name>/<zvol_parent>/<guest_name>/disk_sda
>
>
>
> This creates:
>
>
>
>                 /dev/zvol/<pool_name>/<zvol_parent>/<guest_name>/disk_sda
>
>
>
> Which can be used in the Xen configuration
>
>
>
> I then create a disk label on this zvol to make it useable:
>
>
>
>                 /sbin/parted -s
> /dev/zvol/<pool_name>/<zvol_parent>/<guest_name>/disk_sda mklabel msdos
>
>
>
> Hope this helps.
>
>
>
> Best regards,
>
>
>
> Alex
>
>
>
>
>
> *From:* zfs-discuss [mailto:zfs-discuss-bounces at list.zfsonlinux.org] *On
> Behalf Of *thibaut noah via zfs-discuss
> *Sent:* Tuesday, 16 February 2016 9:50 AM
> *To:* zfs-discuss at kopka.net
> *Cc:* zfs-discuss at list.zfsonlinux.org
> *Subject:* Re: [zfs-discuss] best practice to pass zfs volume to qemu/kvm
>
>
>
> I created my pool with zpool create mirror disk 1 disk2 mirror disk3 disk4.
> I checked if i had something at /dev/zvol and nothing shows up
>
>
>
> 2016-02-15 23:37 GMT+01:00 thibaut noah <thibaut.noah at gmail.com>:
>
> I didn't create a zvol, i just created my pool with all the disks and put
> all my datas in it, can i create a zvol on top of it or will i have to move
> datas to do this?
>
>
>
> 2016-02-15 23:28 GMT+01:00 Gregor Kopka <zfs-discuss at kopka.net>:
>
> just hand /dev/zvol/<poolname>/<path to zvol> to your VM manager and be
> done with it.
>
> Gregor
>
>
>
> Am 15.02.2016 um 23:21 schrieb thibaut noah via zfs-discuss:
>
> Hello, i have a 6tB zfs volume and i'm looking for the best way to pass it
> to my guest os (which is windows 10).
>
> I read the oracle documentation
> http://docs.oracle.com/cd/E19604-01/821-0406/usingzfswithvirtualdisks/index.html
> but i'm not sure if this is the best way to do this.
> My main concern is if i'll have to do manipulations every time i want to
> fire the vm.
> Would like some advice on this please
>
>
>
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