[Kimchi-devel] [RFC] Create logical pool from existing VG

[Jose Ricardo Ziviani]

On 15-10-2015 11:56, Aline Manera wrote:
>
>
> On 15/10/2015 11:45, Jose Ricardo Ziviani wrote:
>> Hello,
>>
>> I'm about to write a new feature to Kimchi. It will allow users to
>> define any existing volume group as a storage pool, where guests will
>> be able to create logical volumes into it. NOTE: VGs already in use as
>> storage pool won't be listed.
>>
>> I read Pooja's "[RFC] Proposal to manage Physical Volumes on Ginger",
>> and now I think all LVM code should be implemented in WOK so both
>> plugins (Kimchi/Ginger) could take advantages from that.
>>
>> API:
>>
>> Collection: /plugins/kimchi/host/vgs
>> Method: GET
>> Returns: list of vgnames:
>> [vgname1, vgname2]
>>
>
> ACK
>
>> Resource: /plugins/kimchi/host/vg/vgname
>> Method: GET
>> Returns: dict
>> { vgname, size, free_size, [PV partition list, like: sda4, sdb3], [LV
>> name list, like: lv_root] }
>>
>
> ACK
>
>> Resource: /plugins/kimchi/storagepools/vgname
>> Method: POST
>> data: { vgname, storagepool_name, type=logical }
>
> I am little bit confused with this API. Usually the POST is done in a
> Collection so, something like:
>
> POST /plugins/kimchi/storagepools {name: pool_name, type: logical,
> vgname: vg_name}
>
> Is that what you are proposing?

yes! updating:

Collection: /plugins/kimchi/storagepools
Method: POST
data: {name: pool_name, type: logical, vgname: vg_name}

>
>>
>> The frontend, I think we could have a table indicating all available
>> devices available for a logical storage pool, for example:
>>
>>
>> Define a New Storage Pool
>> 1. Storage Pool Name
>> +-----------------------------------------+
>> | mypool                                  |
>> +-----------------------------------------+
>> The name used to identify the storage pools, and it should not be empty.
>>
>> 2. Storage Pool Type
>> +-----------+
>> | LOGICAL   |
>> +-----------+
>>
>> 3. Device path
>> +-------+-------+---------------+---------------+
>> |       |device | size        | free size    |
>> +-------+-------+---------------+---------------+
>> | ()     | sdb    | 50 GiB    | 50 GiB    |
>> +-------+-------+---------------+---------------+
>> | ()     | sdc    | 10 GiB    | 8 GiB        |
>> +-------+-------+---------------+---------------+
>> | ()    | vg_a    | 20 GiB    | 18 GiB    |
>> +-------+-------+---------------+---------------+
>>
>> +--------+
>> | Create |
>> +--------+
>
> May user select multiple VGs to create a logical pool? Or is it restrict
> to one by one, one VG, one logical pool?
> Depending on that, we need to redesign the UI

Nope, my initial idea is to have 1 device to 1 storage pool. That's is 
because users can group many partitions (PVs) into one VG.

>
>>
>> _______________________________________________
>> Kimchi-devel mailing list
>> Kimchi-devel at ovirt.org
>> http://lists.ovirt.org/mailman/listinfo/kimchi-devel
>>
>

-- 
Jose Ricardo Ziviani
-----------------------------
Software Engineer
Linux Technology Center - IBM