On 1/10/2014 10:39 PM, Martin K. Petersen wrote:
"Sagi" == Sagi Grimberg <sagig@xxxxxxxxxxxx> writes:
Sagi> What about FORMAT_UNIT emulation? The backstore protection
Sagi> configuration is done at the target side via configfs/targetcli,
I don't know of any non-disk devices that actually implement FORMAT
UNIT. Usually such configuration is done using the array management
interface.
Hmm,
So this takes me to a corner I still don't understand, if a LUN is
pre-formatted as T10-protected, what happens to unwritten blocks read?
I mean, SCSI login executes some reads from sevel LBAs which will
probably fail as blocks are unwritten.
What is the usage model? perform Initiator login and then format the LUN
on the target node? This is why I thought FORMAT_UNIT should be implemented.
I understand this corner will disappear in DIF v2 (following DIX1.1
draft) with ESCAPE flags.
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