Ian,
Thanks - it seems it is a clone:
[root@tritonia-s5 ~]# zfs get origin
zones/34f80d9e-f4c0-c9ca-8b60-cd4800f8dcca-disk0
NAME PROPERTY VALUE
SOURCE
zones/34f80d9e-f4c0-c9ca-8b60-cd4800f8dcca-disk0 origin
zones/812d34be-e190-11e5-bfdd-e73735c18c34@final -
[root@tritonia-s5 ~]#
[root@tritonia-s5 ~]# imgadm list | grep 812
812d34be-e190-11e5-bfdd-e73735c18c34 win2012r2x64-trit01 1.0 windows
zvol 2016-03-03
[root@tritonia-s5 ~]#
PS: I don't WANT to run Windows on my server - but as an independent software
developer for windows apps.... But I do use Xubuntu with KVM (+ GPU
pass-through) for my workstation.
Many thanks for your very prompt reply. Cheers
Sean Weatherall
________________________________
From: Ian Collins [[email protected]]
Sent: 04 March 2016 22:22
To: [email protected]
Subject: Re: [smartos-discuss] Windows on KVM differencing disk (golden image)
On 03/05/16 11:06, TRITONIA SOLUTIONS LIMITED wrote:
Hi,
I've been using KVM on Linux (ProxMox VE) for some years and was interested to
try it out on SmartOS as wanted to use KVM + ZFS (although newer versions of
ProxMox do support ZFS on Linux). Using qcow2 files on linux, and VHDX files on
Hyper-V, you can create differencing disks so that you have a single 'parent
image' which is shared between all of your vm instances (saves a lot of space
as your obviously only storing changes for each vm).
I created a custom KVM image from a sysprep'd Windows Server 2012 R2 x64 vm and
imported it locally as in the wiki. From that I was able to generate new vm
instances but I assume that the zvol created for each new instance is not a
clone of the original zvol (from the golden image) and thus each new vm is
getting a copy of the whole original zvol?
>From a ZFS point of view you can check to see if the volume has an "origin"
>property.
If you have built a KVM from an image, the boot volume should be a clone. For
example I have an Ubuntu KVM built from a Joyent image, thus:
# vmadm get 756317f1-1eb8-427f-880a-8605dc53965b | json disks
[
{
"path": "/dev/zvol/rdsk/zones/756317f1-1eb8-427f-880a-8605dc53965b-disk0",
"boot": true,
"model": "virtio",
"media": "disk",
"image_size": 10240,
"image_uuid": "b33d4dec-db27-4337-93b5-1f5e7c5b47ce",
"zfs_filesystem": "zones/756317f1-1eb8-427f-880a-8605dc53965b-disk0",
"zpool": "zones",
"size": 10240,
"compression": "lz4",
"refreservation": 10240,
"block_size": 4096
}
]
The "image_uuid" shows it was built using this image:
# imgadm avail | grep b33d4dec
b33d4dec-db27-4337-93b5-1f5e7c5b47ce ubuntu-certified-15.04 20150807 linux
2015-08-08T04:06:41Z
To verify disk0 is a clone:
# zfs get origin zones/756317f1-1eb8-427f-880a-8605dc53965b-disk0
NAME PROPERTY VALUE
SOURCE
zones/756317f1-1eb8-427f-880a-8605dc53965b-disk0 origin
zones/b33d4dec-db27-4337-93b5-1f5e7c5b47ce@final -
I'm just interested to know if there is a method using a cloned snapshot of the
original zvol that means I can save all this duplicated space? or maybe I am
just misunderstanding what imgadm actually does?
PS: I can't really afford the memory to enable dedup on the zones pool.
Good, dedup invariably ends it tears...
Many thanks and sorry for being a novice...
We all started sometime!
--
Ian.
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