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Table
Data | Description | |
Field | ||
| ||
Reserva- | The Reservation key field contains an | |
tion Key | sistent reservation is held. | |
| If the Scope field (Byte 13, bits 4 – 7) represents an “Extent” reservation, the | |
Scope- | contains the logical block address (LBA) of the first block of the extent and the Extent Length field (Bytes | |
14 – 15) contains the number of blocks in the extent. | ||
Specific | If the Scope field represents an “Element” reservation, the | |
Address | ||
| ment address, | |
| zero. | |
| The value in this field indicates whether a persistent reservation applies to an entire logical unit, to a part | |
| of the logical unit (defined as an extent), or to an element. | |
| The values for the Scope field are: | |
| Code Name Description | |
| 0h LU Logical Unit. Persistent reservation applies to the full logical unit. The LU scope is therefore imple- | |
| mented by all device servers that implement PERSISTENT RESERVATION OUT. | |
| 1h Extent Persistent reservation applies to the specified extent. When Extent is the scope, it indicates that | |
Scope | the persistent reservation applies to the extent of the logical unit defined by the | |
Extent Length fields in the PERSISTENT RESERVATION OUT command’s parameter list. Note that an | ||
| ||
| extent is defined only for devices defining contiguous logical block addresses. The Extent scope is optional | |
| for all device servers that implement PERSISTENT RESERVATION OUT. | |
| 2h Element Persistent reservation applies to the specified element. When Element is the scope, it indicates | |
| that the persistent reservation applies to the element of the logical unit defined by the | |
| dress field in the PERSISTENT RESERVATION OUT parameter list. An element is as defined by the | |
| ||
| that implement PERSISTENT RESERVATION OUT. | |
| 3h – Fh Reserved | |
Type | The value of the Type field specifies the characteristics of the persistent reservation being established for | |
all data blocks within the extent or within the logical unit. Refer to Table | ||
| and their meanings | |
| Table | |
| from the Type field of the PERSISTENT RESERVATION IN Read Reservations | |
| parameters. | |
| Each of the codes provides handling instructions for READ operations, for WRITE | |
| operations, and for subsequent attempts to establish persistent reservations (referred to | |
| as “Additional Reservations Allowed” in the table). |
Maxtor Atlas 10K V |