12:20 p.m.
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.
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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