[Kimchi-devel] [RFC] FIBRE CHANNEL StoragePool

[Mark Wu]

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.

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.










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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