[Kimchi-devel] A question about iSCSI storage pool

[Yu Xin Huo]

Opened a bug to track it.
https://github.com/kimchi-project/kimchi/issues/459

On 9/19/2014 3:01 PM, Yu Xin Huo wrote:
> I tried it again today and found below:
>
> 1. I can create 2 templates with the same volume of iSCSI storage pool.
> 2. I can create 2 guests with the same template configured against a 
> volume of iSCSI storage pool.
>
> I think both the design and implementation have problems
>
> 1. For template, as it need to be used to create multiple guests, 
> resources there must be collection like network/storage pool, should 
> not be a volume.
> 2. As volume need to support both read/write, we need to avoid 2 
> guests use the same volume as boot disk.
>
> Recommended design:
>
> 1. In template, when edit, only list storage pool, remove iscsi pool 
> volumes there.
> 2. When create guest, once user selected the template, if it is iscsi, 
> add a section with a dropdown list for user to select volume, for 
> volume already in use, filter them out.
>
>
> On 9/19/2014 10:48 AM, Aline Manera wrote:
>>
>> On 09/18/2014 08:07 AM, Yu Xin Huo wrote:
>>> I got a iSCSI target to work on my redhat with a USB disk to test 
>>> iSCSI storage pool and found below:
>>>
>>> 1. When create a iSCSI storage pool, I selected a target in dropdown 
>>> list.
>>> 2. Once the pool is created, I see a volume named 'unit:0:0:1'.
>>> 3. When edit template, in the 'storage pool' dropdown, 'unit:0:0:1' 
>>> is listed there.
>>>
>>> So 'unit:0:0:1' which indeed is a *volume* but listed as a *pool* in 
>>> template?  or something I am misunderstanding?
>>
>> The "Storage pool" on Template represents where the guest disk will 
>> be created.
>> So if I specify "default" pool and size 10GB my guest will have a 
>> 10GB disk created on the default pool (under /var/lib/libvirt/images, 
>> for example)
>>
>> But it is not true for iSCSI and SCSI pools.
>> We call the iSCSI and SCSI pools as read-only because we can not 
>> create new files on it.
>> The volumes are pre-configured by the system. Because that while 
>> using those pools you also need to select the volume as are 
>> represented by <pool_name>/<vol_name> in the combo box.
>>
>> When a iSCSI or SCSI pool/volume is selected on Template the user can 
>> not edit its size, as the volume already exists and has a size.
>>
>
>
>
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