Fujitsu MBA3073RC, MBC2036RC, MBC2073RC, MBA3300RC, MBA3147RC specifications Control/Sense Commands

4.1 Control/Sense Commands

The specification of the "Service Action Reservation Key" field is necessary for the REGISTER, PREEMPT, and PREEMPT and ABORT Service Actions. For the REGISTER Service Action, a Reservation Key to be newly registered is set in this field. For the PREEMPT and, PREEMPT and ABORT Service Actions, the Reservation Key of the INIT that holds a reserve condition to be cleared (preempted) is set in this field. For the PREEMPT and, PREEMPT and ABORT Service Actions, if the value specified in this field does not match any of the Reservation Keys registered, the drive reports the RESERVATION CONFLICT status. For the Service Actions listed below, the value specified in this field is ignored.

When the Scope value indicates Element Reservation, an element address (with the high byte filled with zeroes) is set in the Scope-specific Address field. If the Service Action is REGISTER, REGISTER and IGNORE EXISTING KEY, or CLEAR, or if the Scope indicates LU Reservation, set zero in the Scope-specific Address field. The Activate Persist Through Power Loss (APTPL) bit is valid only for the REGISTER Service Action. For the other Service Actions, this bit is ignored. The support of the APTPL bit is optional, and if this bit is set for a drive that does not support this bit, the drive terminates this command with the CHECK CONDITION status. At this time, the sense key is set to ILLEGAL REQUEST [= 5], and the sense data is set to INVALID FIELD IN PARAMETER LIST [= 26-00].

If the value of the APTPL bit that is last received by the drive is '0,' the power shutdown of the TARG releases all the PERSISTENT RESERVATIONs and clears all the Reservation Keys. If the value of the APTPL bit that is last received by the drive is '1,' the logical unit maintains all the PERSISTENT RESERVATIONs and Reservation Keys for all the INITs throughout power shutdown and re-power-on sequences (the SA space is used to save the registration information). The APTPL value, which controls the logical unit behavior while the power is turned off, is valid regardless of which INIT the bit value has been received from.

Table 4.32 explains which fields are set by an application client and how such fields are recognized by a drive as regards each Service Action and Scope value. As for Reservation Keys and APTPL, they are as explained above.

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