IBM DCAS-32160 - Ultrastar 2.1 GB Hard Drive, Specifications

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11.1.11 Command Processing While Reserved
A logical unit is reserved after successful execution of the Reserve command. Each time a Reserve command
is executed successfully, the Target records the SCSI ID of the Initiator that made the reservation and the
SCSI ID of the Initiator that is to receive the reservation. This information is needed to determine whether
subsequent commands should be permitted or if the Reservation Conflict Status should be reported. The
Initiator that made the reservation is the Initiator that issued the Reserve command. The Initiator to receive
the reservation may be either the same or a different Initiator(third-party reservation).
If the logical unit is reserved when a new command is received, the Target examines the command opcode
and the SCSI ID of the issuing Initiator to determine whether a Reservation Conflict Status should be
returned based on the following rules:
1. If the issuing Initiator is the one that made the reservation and also the one to receive the reservation
then:
All commands are permitted.
2. If the issuing Initiator is neither the one that made the reservation nor the one to receive the reservation
then:
A Request Sense or Inquiry command is permitted.
A Release command is permitted but is ignored.
Any other command results in a Reservation Conflict Status.
3. If the issuing Initiator is the one that made the reservation but is not the one to receive the reservation
then:
An Inquiry, Request Sense, Reserve, or Release command is permitted.
Any other command results in a Reservation Conflict Status.
4. If the issuing Initiator is not the one that made the reservation but is the one to receive the reservation
then:
An Reserve command results in a Reservation Conflict Status.
A Release command is permitted but is ignored.
Any other command is permitted.
Degraded
Mode Entry Reason Accepting
Request Description and sense code
U-code Can not read
u-code Same as Spin-up
Degrade Return U-code Degraded Mode.
Sense code = 4085 (u-code download fail)
Reserved
Area
Fail to read
drive config-
uration data
Fail to read
Defect list
Fail to read
saved Mode
Parameter
All commands. Reserved area sector valid check failed. Defective
sector found in reserved area. (Hard Error) The
integrity of the drive is questionable.
Sense code = 4080 (diagnostic fail),
192
O E M Spec. of DCAS-34330/32160