On 07/05/2011 04:30 AM, James Bottomley wrote: > On Tue, 2011-07-05 at 04:29 +0530, Ankit Jain wrote: >> On 07/04/2011 09:05 PM, James Bottomley wrote: >>> On Mon, 2011-07-04 at 20:46 +0530, Ankit Jain wrote: >>>> Some SES devices give non-unique Element Descriptors as part of the >>>> Element Descriptor diag page. Since we use these for creating sysfs >>>> entries, they need to be unique. >>>> >>>> Eg: >>>> $ sg_ses -p 7 /dev/sg0 >>>> FTS CORP TXS6_SAS20BPX12 0500 >>>> enclosure services device >>>> Element descriptor In diagnostic page: >>>> generation code: 0x0 >>>> element descriptor by type list >>>> Element type: Array device, subenclosure id: 0 >>>> Overall descriptor: ArrayDevicesInSubEnclsr0 >>>> Element 1 descriptor: ArrayDevice00 >>>> Element 2 descriptor: ArrayDevice01 >>>> Element 3 descriptor: ArrayDevice02 >>>> Element 4 descriptor: ArrayDevice03 >>>> Element 5 descriptor: ArrayDevice03 >>>> Element 6 descriptor: ArrayDevice03 >>>> Element 7 descriptor: ArrayDevice03 >>>> Element 8 descriptor: ArrayDevice03 >>>> Element 9 descriptor: ArrayDevice03 >>>> Element 10 descriptor: ArrayDevice03 >>>> Element 11 descriptor: ArrayDevice03 >>>> Element 12 descriptor: ArrayDevice03 >>> >>> What is the external visible labelling of this topology? It's >>> completely weird that the enclosure would burn in non-unique names >>> unless there's some reason for it. >> >> I'm not sure what you mean by "external visible labelling". The system has a >> SAS expanded backplane. I don't have access to the hardware now, but p7 looked >> like this: > > The element descriptors usually correspond with labelling on the case of > whatever it is the enclosure is embedded in. Their job is to describe > the location of the device, so they usually get burned in with whatever > the default labelling scheme for the physical device is. So what I want > to know is what is the labelling scheme in this case? I don't have direct access to the box, so I asked the person who does, and he says: "the labelling is just 1-12 unless I'm mistaken.". The duplicate descriptors is a firmware bug, but since the specification doesn't say that these have to be unique, we should handle these, IMHO. -- Ankit Jain SUSE Labs -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
