Dell PowerVault ML6000 Dell PowerVault ML6000 SCSI Reference Guide - Page 62

Scope, Parameter List Length, Reservation Key, Service Action Reservation Key, Scope-Specific Address

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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. Table 49 PERSISTENT RESERVE OUT parameter list Byte Bit 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 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. 52 SCSI Commands

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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