Re: [Bug 111441] New: iscsi fails to attach to targets

[Mike Christie <michaelc@cs.wisc.edu>]

On 01/30/2016 01:38 AM, Nicholas A. Bellinger wrote:
> On Fri, 2016-01-29 at 17:32 -0600, Mike Christie wrote:
>> On 01/29/2016 04:21 PM, Serguei Bezverkhi (sbezverk) wrote:
>>> HI Mike,
>>>
>>> I tried your patch and it is has eliminated first traceback but I still do not see my remote targets.
>>>
>>
>> That is sort of expected. Your target is not setup for ALUA properly. It
>> says it supports ALUA, but when scsi_dh_alua asks about the ports it is
>> reporting there are none. Ccing the people that made the patch that
>> added the issue and own the code.
>>
>> Hey Christoph and Hannes,
>>
>> The dh/alua changes that added this:
>>
>>         error = scsi_dh_add_device(sdev);
>>         if (error) {
>>                 sdev_printk(KERN_INFO, sdev,
>>                                 "failed to add device handler: %d\n",
>> error);
>>                 return error;
>>         }
>>
>> to scsi_sysfs_add_sdev are adding a regression.
>>
>> 1. If that fails, then we forget to do device_del before doing the
>> return. My patch in this thread added that back, so we do not see the
>> sysfs oopses anymore. But.....
>>
>> 2. It looks like in older kernels, we would allow misconfigured targets
>> like this one to still setup devices. Do we want that old behavior back?
>> Should we just ignore the return value from scsi_dh_add_device above?
>> Note that in this case, it is LIO so it can be easily fixed on the
>> target side by just setting it up properly. I do not think other targets
>> would hit this type of issue.
>>
> 
> Btw, what does misconfigured mean here wrt target ALUA..?

[   25.833195] sd 6:0:0:4: alua: supports implicit and explicit TPGS
[   25.833360] sd 6:0:0:4: alua: No target port descriptors found
[   25.833363] sd 6:0:0:4: alua: Attach failed (-22)
[   25.833365] sd 6:0:0:4: failed to add device handler: -22

He has LIO configured to report it supports implicit/explicit ALUA, but
the ports do not seem to be configured.

For the LIO config side, are his LUNs just not in a the default_lu_gp or
any other group?