Background operations and power loss expected

Truong Nguyen - SISA tru.nguyen at
Wed Oct 5 10:14:46 PDT 2011

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In 10-144r3 (SPC:4 Self-test and SEND DIAGNOSTIC command clean-up), text
was added to the Self-test operations Background mode model clause,
specifying changes regarding power loss expected handling. Specifically,
in sub-clause Background mode (SPC-4r32), the following text was
"A SCSI target device shall abort a self-test being performed in the
background mode as the result of a power loss expected event (see
However, in SAM-4r14 (and in SAM-5r07), the following text is present in
sub-clause 5.5 Command lifetime:
"Background operations shall not be aborted by I_T nexus loss or power
loss expected."
When a power loss expected event occurs, which is the correct behaviour
in terms of the background self-test? Should it be aborted or not be
Truong Nguyen
Samsung Information Systems

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