Dell PowerVault ML6000 - Manual (Page 62)

52 SCSI Commands
Scope – Only logical unit scope is supported, and this field must be a 0h.
Type – This field specifies the type of reservation as follows:
• 3h Exclusive Access – The initiator holding the persistent reservation has exclusive read and
write access. Requests from any other initiators to transfer data to or from the logical unit will result
in a Reservation Conflict.
• 6h Exclusive Access, Registrants Only – Any currently registered initiator has exclusive data
transfer access. Requests from unregistered initiators to transfer data to or from the logical unit will
result in a Reservation Conflict.
Parameter List Length – This field returns 18h (24) to indicate the length of the PERSISTENT RESERVE
OUT parameter list, which is shown in the following table.
Reservation Key – This is an 8-byte reservation key that identifies the initiator.
Service Action Reservation Key – This field only applies to the following service actions as follows:
• Register – This is the new reservation key to register.
• Register and Ignore Existing Key – This is the new reservation key to register.
• Preempt – This is the reservation key of the persistent reservation to preempt.
• Preempt and Abort – This is the reservation key of the persistent reservation to preempt.
Scope-Specific Address – Element reservations are not supported and this field must be 0000h.
Activate Persist Through Power Loss (APTPL) – Persistent reservations are not supported across power
cycles, so this field must be 0.
Table 49 PERSISTENT RESERVE OUT parameter list
Bit
Byte
7 6 5 4 3 2 1 0
0
Reservation Key
7
8
Service Action Reservation Key
15
16
Scope-Specific Address
19
20 Reserved APTPL
21 Reserved
22
Obsolete
23