Re: fc transport creates second set of targets for devices in an "md"

Michael Reed
2006-06-09T16:35:35Z

Mike Christie wrote:
> Michael Reed wrote:
>> I created an md device on two fibre channel disks, sde and sdf.
>> I then disabled the switch port to which the hba is connected.
>> After the remote port time out messages, I re-enabled the switch
>> port. Three things happen that are weird. First, two unexpected
>> responses while scanning. Second, the creation of sdm and
>> sdn. Third, the md device remains inaccessible.
>>
>> I don't think this is working the way it's intended to. I
>> suspect it will cause big problems for multi-path volume managers
>> in a fail back situation.
>>
>
> Even if the rport is removed and the devices under it are removed, md
> can still have a reference to the device so the memory does not
> disappear on it (MD still thinks the device is there but scsi says it is
> gone basically). Because of this, when you plug in the cable again and a
> new rport is created sd.c can end up allocating another sdX value.
>

So, how about a callback to the driver, md, with the reference so that it
can release said reference?

Mike