[stgt] [PATCH 15/15] Remove dummy RAID controller from LUN 0

[Mark Harvey]

On Fri, Nov 27, 2009 at 1:38 AM, Boaz Harrosh <bharrosh at panasas.com> wrote:
> On 11/26/2009 01:07 PM, FUJITA Tomonori wrote:
>> On Thu, 26 Nov 2009 12:27:37 +0200
>> Boaz Harrosh <bharrosh at panasas.com> wrote:
>>
>>> On 11/26/2009 12:22 PM, FUJITA Tomonori wrote:
>>>> On Thu, 26 Nov 2009 12:08:21 +0200
>>>> Boaz Harrosh <bharrosh at panasas.com> wrote:
>>>>
>>>>> On 11/26/2009 10:13 AM, FUJITA Tomonori wrote:
>>>>>> On Wed, 25 Nov 2009 17:42:04 +0200
>>>>>> Boaz Harrosh <bharrosh at panasas.com> wrote:
>>>>
>>>>> Lets try and find an acceptable solution. What if we refuse any
>>>>> connections until we have the first LUN configured. I know how to do
>>>>> it in iscsi, is there a way to do it in a general way?
>>>>
>>>> OpenSolaris target implementation requests you to create a target
>>>> *with* a logical unit. It's another hacky solution.
>>>>
>>>> I don't think that we need to change the current way.
>>>
>>> What about a command line option for us users who would like not
>>> to see that tgt-LUN0. Would you accept a command line switch, off
>>> by default. Something like --hide-lun0 ?
>>
>> What I'm against is hacky code for shadow or hidden lun. I prefer to
>> keep the code clean rather than handle poor OSes kindly.
>
> I don't care about poor OSes, I care about Linux initiator. When I have
> multi-lun osd-target environment that extra target adds an
> sg + request_queue + all that extra resources that are un-needed, never
> used on the initiator machine. And it is surprising and raises questions
> as one logged into an osd-target and gets this extra device in the logs.
> I suspect that it is the same for any target that exports a specialized
> device. (I'm not using any scsi-disks so I can't comment on that)
>
> Is there a better way to get rid of it then the "hacky hidden lun"? maybe
> an error handling code at the core that eliminates the need for it? what is
> your suggestion?
>
> Boaz
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Is there a way to 'reconfigure' or 'redefine' LUN0 ?

i.e. Leave LUN0 there at startup time and then reconfigure to
appropriate type (disk/osd/ssc/mmc etc) as required by the user.

My 2c worth.

Cheers
Mark
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