[ovirt-devel] Interacting with VDSM storage without oVirt Engine

[Hayley Swimelar]

On 05/31/2016 08:25 AM, Yaniv Dary wrote:
> Can you explain the use case? What are you trying to use VDSM for?
> The API you want to use is internal and can break without notice.

Hi Yaniv,

I'm working to to integrate DRBD storage into VDSM.

It will be a new type of storage domain, so I can't use the GUI since 
the engine component won't be aware of it as far as I can tell.

The current plan is to have another developer on our end make changes to 
the Engine once the VDSM side is working.

>
> Yaniv Dary
> Technical Product Manager
> Red Hat Israel Ltd.
> 34 Jerusalem Road
> Building A, 4th floor
> Ra'anana, Israel 4350109
>
> Tel : +972 (9) 7692306
>         8272306
> Email: ydary at redhat.com
> IRC : ydary
>
>
> On Wed, May 25, 2016 at 8:29 PM, Hayley Swimelar <hayley at linbit.com> wrote:
>
>>
>>
>> On 05/25/2016 02:00 AM, Martin Sivak wrote:
>>
>>> Hi,
>>>
>>> I do not remember exacly, but you might check the source code of
>>> hosted engine's VdsmBackend where we do that too.
>>>
>>>
>>> https://gerrit.ovirt.org/gitweb?p=ovirt-hosted-engine-ha.git;a=blob;f=ovirt_hosted_engine_ha/lib/storage_backends.py;h=f2fbdc43d0e4afd7539a3a1de75de0cb07bdca9d;hb=a012f184584af20d3dba8038d73b8d9b447af7b3
>>>
>>> I think you are missing the prepareImage call.
>>>
>>
>> I think that prepareImage is probably the missing piece to this; however,
>> it seems that the hosted engine's create_volume method with calls
>> _get_volume_path which calls prepareImage.
>>
>> vdsClient's prepareImage command takes a volume UUID as an agrument I've
>> tried passing the new UUID I created for the createVolume command, the UUID
>> returned from that command, and a fresh UUID. All of these return the same
>> error: Volume does not exist
>>
>> I've also tried manually creating the image directory under the storage
>> domain directory with the same results for all commands.
>>
>>
>>
>>> Regards
>>>
>>> --
>>> Martin Sivak
>>> SLA / oVirt
>>>
>>> On Wed, May 25, 2016 at 1:44 AM, Hayley Swimelar <hayley at linbit.com>
>>> wrote:
>>>
>>>> Hello all,
>>>>
>>>> Like the title says, I need to work with VDSM's storage layer without
>>>> involving the engine.
>>>>
>>>> Presently, I'm testing this with NFS domains and have been able to use
>>>> vdsClient to create, attach, and activate a new storage domain, but I
>>>> have
>>>> not been able to create a new image or volume.
>>>>
>>>> Here are the commands I ran to get to this step, starting with a nfs
>>>> volume
>>>> already mounted on the machine I ran the commands on.
>>>>
>>>> ----
>>>> vdsClient -s host_name createStorageDomain 1
>>>> 97338d5c-9b6f-1859-b827-e977ed082e53 cli_domain storage_server:/data
>>>>
>>>> vdsClient -s host_name attachStorageDomain
>>>> 97338d5c-9b6f-1859-b827-e977ed082e53 00000001-0001-0001-0001-00000000033c
>>>>
>>>> vdsClient -s host_name activateStorageDomain
>>>> 97338d5c-9b6f-1859-b827-e977ed082e53 00000001-0001-0001-0001-00000000033c
>>>>
>>>> vdsClient -s frodo createVolume 97338d5c-9b6f-1859-b827-e977ed082e53
>>>> 00000001-0001-0001-0001-00000000033c 0288f410-71f1-4b7d-bdb7-e815a93e34ef
>>>> 53690000000 5 1 2 96d7726c-6969-40a5-84bd-0925496b6051 cli_volume
>>>> ----
>>>>
>>>> The last command outputs a new UUID, but there is nothing under
>>>>
>>>> /rhev/data-center/00000001-0001-0001-0001-00000000033c/97338d5c-9b6f-1859-b827-e977ed082e53/images/
>>>> directory.
>>>>
>>>> If I pass createVolume an existing image/storage domain UUID, the command
>>>> still outputs a new UUID, but nothing changes under the images directory.
>>>>
>>>> Is there a step that I am missing somewhere in this process?
>>>>
>>>> --
>>>> Hayley Swimelar
>>>> LINBIT | Keeping the Digital World Running
>>>> DRBD — Corosync — Pacemaker
>>>> +1-503-573-1262 x212
>>>> _______________________________________________
>>>> Devel mailing list
>>>> Devel at ovirt.org
>>>> http://lists.ovirt.org/mailman/listinfo/devel
>>>>
>>>
>> --
>> Hayley Swimelar
>> LINBIT | Keeping the Digital World Running
>> DRBD — Corosync — Pacemaker
>> +1-503-573-1262 x212
>> _______________________________________________
>> Devel mailing list
>> Devel at ovirt.org
>> http://lists.ovirt.org/mailman/listinfo/devel
>>
>

-- 
Hayley Swimelar
LINBIT | Keeping the Digital World Running
DRBD — Corosync — Pacemaker
+1-503-573-1262 x212