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

[Aline Manera]

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?

>
> 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

>
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