[Kimchi-devel] [RFC] FIBRE CHANNEL StoragePool

[Aline Manera]

On 12/20/2013 04:02 AM, Mark Wu wrote:
> Hi Rodrigo,
>
> In my understanding, this task could include the following sub-tasks:
>
> 1. Allow user to define a storage pool by specifying a fc host. (by 
> the second link you added)
> 2. Allow user to configure vm to use LUN contained in the storage pool 
> defined in 1. It can be done by "type='volume'",  which only available 
> from libvirt 1.0.5.
>    You also can get an example from the link 1 you added.
>    That also needs to change the vm template and kimchi's vm creation 
> flow, because  kimchi can't use existing volume or image. And we can't 
> create new
>    volume in a 'scsi' pool or 'iscsi' pool. For these two kinds of 
> storage pool,  we only can use the volumes(LUNs) predefined on the 
> storage backend.
> 3. Add a 'refresh' operation for the storage pool.  It will invoke a 
> scsi rescan automatically by libvirt.  So after the storage admin add 
> new luns on the storage,
>    it can just click the 'refresh' button instead of manually invoking 
> rescan manually.
>

I have the same idea as Mark.

Just one more point about 1: while creating a new pool the user must 
specify the fc_host and wwnn:wwpn pairs
Based on that we should be able to expose the wwnn:wwpn pairs to user - 
which would be a separated task.

 From that, I would like to see:

- one patch set that implements items 1 and 2
- one patch set that implements item 3
- one patch set that exposes wwnn:wwpn pairs to user


> What benefits can provide this feature?  Actually, except it can help 
> the host storage management a little bit easier,  I don't see others.
> Because we can just use logical pool on top of the LUNs provided by fc 
> host.  It also provide more flexibility.  It doesn't like iscsi,  
> libvirt provide connection
> management.  For fc host,  kernel can probe and attach the LUNs on 
> boot up.
>
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> On Fri 20 Dec 2013 05:27:52 AM CST, Rodrigo Trujillo wrote:
>> Hi all,
>>
>> continuing the discussion:
>>
>> So, what to do ?
>> Create/Enable SCSI StoragePool ?, then list FC devices on it ?
>>
>> ##############    from previous emails    ################
>>
>> - Fibre Channel is used as a subtype of SCSI
>> - FC LUNs will be mapped as /dev/sdX devices
>> - Those devices can be used as PV in a VG , or as a Logical StoragePool
>> - LUNs can also be mapped as
>> /dev/disk/by-id/wwn-0x600507680280865df800000000000060
>>
>> Links:
>> http://wiki.libvirt.org/page/NPIV_in_libvirt#NPIV_in_libvirt
>> http://libvirt.org/formatstorage.html (search for 'fc_host')
>>
>> ##############################################
>>
>>
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>
>
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