Re: Multi-Actuator SAS HDD First Look

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On 2018-04-06 02:42 AM, Christoph Hellwig wrote:
On Fri, Apr 06, 2018 at 08:24:18AM +0200, Hannes Reinecke wrote:
Ah. Far better.
What about delegating FORMAT UNIT to the control LUN, and not
implementing it for the individual disk LUNs?
That would make an even stronger case for having a control LUN;
with that there wouldn't be any problem with having to synchronize
across LUNs etc.

It sounds to me like NVMe might be a much better model for this drive
than SCSI, btw :)

So you found a document that outlines NVMe's architecture! Could you
share the url (no marketing BS, please)?


And a serious question ... How would you map NVMe's (in Linux)
subsystem number, controller device minor number, CNTLID field
(Identify ctl response) and namespace id onto the SCSI subsystem's
h:c:t:l ?

Doug Gilbert




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