[ovirt-users] virtual machine actual size is not right

[Pavol Brilla]

Hi

just small note why size of disk differs between ovirt and system:

30G in ovirt = 30*1024*1024*1024 bytes = 32212254720 bytes = 32.2GB which
you see in parted output


I dont know that much about storage to help with it and I can only cite
from oVirt webpages[1]:
Thin Provision allocates 1 GB at the time the virtual disk is created and
sets a maximum limit on the size to which the disk can grow. The virtual
size of the disk is the maximum limit; the actual size of the disk is the
space that has been allocated so far. Thinly provisioned disks are faster
to create than preallocated disks and allow for storage over-commitment.
Thinly provisioned virtual disks are recommended for desktops.

[1]
https://www.ovirt.org/documentation/admin-guide/chap-Virtual_Machine_Disks/




On Tue, Mar 27, 2018 at 9:02 AM, Terry hey <recreationh at gmail.com> wrote:

> Hello, thank you for helping me.
>
> On the storage domain size:
> Alias: host1
> Disk: 1
> Template: Blank
> Virtual Size: 30 GB
> Actual Size: 13 GB
> Creation Date: Jan 29,2018 11:22:54 AM
>
> On the server size:
> # df -h
> Filesystem               Size  Used Avail Use% Mounted on
> /dev/mapper/vg01-root     10G  7.2G  2.9G  72% /
> devtmpfs                 1.9G     0  1.9G   0% /dev
> tmpfs                    1.9G  4.0K  1.9G   1% /dev/shm
> tmpfs                    1.9G   17M  1.9G   1% /run
> tmpfs                    1.9G     0  1.9G   0% /sys/fs/cgroup
> /dev/sda1               1014M  188M  827M  19% /boot
> /dev/mapper/vg01-var      15G  996M   15G   7% /var
> XXX.XXX.XXX.XXX:/nfs_share  249G   96G  141G  41% /mnt/nfs_share
> tmpfs                    379M     0  379M   0% /run/user/0
>
> # parted -l /dev/[sv]d[a-z] | grep ^Disk
> Disk /dev/sda: 32.2GB
> Disk Flags:
> Disk /dev/mapper/vg01-var: 16.1GB
> Disk Flags:
> Disk /dev/mapper/vg01-swap: 2147MB
> Disk Flags:
> Disk /dev/mapper/vg01-root: 10.7GB
> Disk Flags:
> #
>
> It still not the same. Also, do you know the upper limitation for thin
> provision?
> For example, if i allocated 30 GB to the hosts, what is the upper
> limitation that the host can use?
>
> Regards,
> Terry
>
> 2018-03-23 18:45 GMT+08:00 Pavol Brilla <pbrilla at redhat.com>:
>
>> Hi
>>
>> For such big difference between size outside of VM and inside, it looks
>> more that disk is not fully partioned.
>> df is providing you information only about mounted filesystems.
>> Could you try to run inside VM should match all local disks, and you
>> should see size of disk :
>> # parted -l /dev/[sv]d[a-z] | grep ^Disk
>>
>> ( Output of 1 of my VMs ):
>> # parted -l /dev/[sv]d[a-z] | grep ^Disk
>> Disk /dev/sda: 26.8GB
>> Disk Flags:
>> Disk /dev/mapper/rootvg-lv_tmp: 2147MB
>> Disk Flags:
>> Disk /dev/mapper/rootvg-lv_home: 210MB
>> Disk Flags:
>> Disk /dev/mapper/rootvg-lv_swap: 2147MB
>> Disk Flags:
>> Disk /dev/mapper/rootvg-lv_root: 21.8GB
>>
>> So I see that VM has 26.8GB big disk.
>>
>> On Thu, Mar 22, 2018 at 5:56 PM, Terry hey <recreationh at gmail.com> wrote:
>>
>>> Hello~
>>> i type this command on the running vm, not the hypervisor ( ovirt node).
>>>
>>
>>
>>
>> --
>>
>> PAVOL BRILLA
>>
>> RHV QUALITY ENGINEER, CLOUD
>>
>> Red Hat Czech Republic, Brno <https://www.redhat.com/>
>> <https://red.ht/sig>
>> TRIED. TESTED. TRUSTED. <https://redhat.com/trusted>
>>
>
>


-- 

PAVOL BRILLA

RHV QUALITY ENGINEER, CLOUD

Red Hat Czech Republic, Brno <https://www.redhat.com/>
<https://red.ht/sig>
TRIED. TESTED. TRUSTED. <https://redhat.com/trusted>
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