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

Schlacta, Christ aarcane at aarcane.org
Tue Feb 16 00:03:48 EST 2016


I've found I pretty much always get better performance with a file than
with a zvol, but I am using either a single wide raidz or only a single
mirror.
On Feb 15, 2016 5:45 PM, "João Carlos Mendes Luís" <
zfs-discuss at list.zfsonlinux.org> wrote:

> Create a small ZVOL (or just a local file, although the ZVOL may have a
> little better performance) just to hold the boot and Operating System, and
> mount everything else through CIFS.
>
> That's what I do, and have done even before ZFS.
>
>
> On 02/15/2016 09:02 PM, thibaut noah via zfs-discuss wrote:
>
> 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
>>
>>
>>
>> _______________________________________________
>>
>> zfs-discuss mailing list
>>
>> zfs-discuss at list.zfsonlinux.org
>>
>> http://list.zfsonlinux.org/cgi-bin/mailman/listinfo/zfs-discuss
>>
>>
>>
>>
>>
>>
>>
>
>
>
> _______________________________________________
> zfs-discuss mailing listzfs-discuss at list.zfsonlinux.orghttp://list.zfsonlinux.org/cgi-bin/mailman/listinfo/zfs-discuss
>
>
>
> _______________________________________________
> zfs-discuss mailing list
> zfs-discuss at list.zfsonlinux.org
> http://list.zfsonlinux.org/cgi-bin/mailman/listinfo/zfs-discuss
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://list.zfsonlinux.org/pipermail/zfs-discuss/attachments/20160215/40aef4cc/attachment.html>


More information about the zfs-discuss mailing list