Re: [PATCH] libata: rewrite SCSI host scheme to be one per ATA host

Stefan Richter
2009-04-24T11:00:49Z

Grant Grundler wrote:
> Data Center
> environments (not just Google's) like to track disks in many different
> ways, including the SCSI identifiers since this one "key" for physical
> location. Breaking the current mappings is going to cause some people
> a world of pain

If by SCSI identifiers you mean the Linux SCSI core's h:c:i:l, then
remember that these are scsi-core internal artifacts without any meaning
to lower and upper layers whatsoever, including userspace. (Exception:
The c:i:l part has some significance with SCSI Parallel Interface
attached hardware.)

> since they will need to manually build (and integrate)
> old->new maps of the SCSI identifiers.

Stock udev already provides mapping according to actually useful
identifiers (if the respective transport provides them: persistent and
unique identifiers of targets and logical units).
--
Stefan Richter
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