User manual SEAGATE ATLAS 10K II PRODUCT MANUAL

[. . . ] Quantum AtlasTM10K II 9. 2/18. 4/36. 7/73. 4 GB Ultra 160/m S Product Manual June 8, 2000 81-122517-04 Quantum reserves the right to make changes and improvements to products without incurring any obligation to incorporate such changes or improvements in units previously sold or shipped. Quantum reserves the right to make changes to this product manual without incurring any obligation to notify recipients of earlier versions of the product manual. You can request Quantum publications from your Quantum Sales Representative, or order them directly from Quantum. Publication Number: 81-122517-04 June 8, 2000 UL / CSA / VDE / TÜV / FCC UL standard 1954 recognition granted under File No. [. . . ] The value in the Generation field is set to 0 as part of the power on or reset processes. The value in the Generation field allows the application client that examines the value to verify that the configuration of the initiators attached to a logical unit has not been modified by another application client without any notification of the application client doing the examination. Additional Length This field contains the count of the number of bytes that are in the Reservation Key list (bytes 8 ­ n). Note that this field contains the number of bytes in the reservation key list regardless of the value prescribed by the Allocation Length field in the command's CDB. Each of the Reservation Keys appear as items in a list as bytes 8 through n. Each entry reflects an 8-byte reservation key registered with the device server via the PERSISTENT RESERVATION OUT, Reserve, Pre-empt, Pre-empt and Clear, or Register service actions. Each key can be examined by the application client for correlation with a set of initiators and SCSI ports Reservation Keys Quantum Atlas 10K II Ultra160/m SCSI Hard Disk Drives 5­115 SCSI Description PERSISTENT RESERVATION IN Command (5Eh) (continued) The figure and table below illustrate and describe the data fields of Read Reservations data parameters. Bit Byte (MSB) 0-3 (MSB) 4-7 (MSB) 8-n Reservation Descriptors (See Figure 5-53 / Table 5-55 for detail of a Descriptor Field) (LSB) Additional Length (n ­ 7) (LSB) Generation (LSB) 7 6 5 4 3 2 1 0 Figure 5­52 Read Reservations Parameters -- Data Format Table 5­54 Read Reservations Parameters -- Field Descriptions Data Field Generation Description The value in this field is a 32-bit counter in the device server that is incremented each time a PERSISTENT RESERVATION OUT command requests a Register, Clear, Pre-empt, or Pre-empt and Clear operation. Note that PERSISTENT RESERVATION IN commands do not increment the counter, nor do PERSISTENT RESERVATION OUT commands that perform a Reserve or Release service action, or by a PERSISTENT RESERVATION OUT command that is not done due to an error or a reservation conflict. The value in the Generation field is set to 0 as part of the power on or reset processes. The value in the Generation field allows the application client that examines the value to verify that the configuration of the initiators attached to a logical unit has not been modified by another application client without any notification of the application client doing the examination. Additional Length This field contains the count of the number of bytes of Reservation descriptors (bytes 8 ­ n). Note that this field contains the number of bytes regardless of the value prescribed by the Allocation Length field in the command's CDB. One Reservation descriptor is reported for each unique persistent reservation on the logical unit when the PERSISTENT RESERVATION IN command has indicated a Read Reservations action. Figure 5-54 and Table 5-55 detail the contents of each Reservation Descriptors field. Reservations Descriptors 5­116 Quantum Atlas 10K II Ultra160/m SCSI Hard Disk Drives SCSI Description PERSISTENT RESERVATION IN Command (5Eh) (continued) The figure and table below illustrate and describe the data fields of each Read Reservations descriptor's data fields. Bit Byte (MSB) 0-7 (MSB) 8 - 11 Scope-Specific Address (LSB) 12 Reserved Reservation Key (LSB) 7 6 5 4 3 2 1 0 13 (MSB) 14 - 15 Scope Type Extent Length (LSB) Figure 5­53 PERSISTENT RESERVATION IN Read Reservations Descriptor -- Data Format Table 5­55 PERSISTENT RESERVATION IN Read Reservations Descriptor -- Field Descriptions Data Field Reservation Key Description The Reservation key field contains an 8-byte value that identifies the reservation key under which the persistent reservation is held. If the Scope field (Byte 13, bits 4 ­ 7) represents an "Extent" reservation, the Scope-Specific Address field 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. If the Scope field represents an "Element" reservation, the Scope-Specific Address field contains the Element address, zero-filled in the most significant bytes to fit the field and the Extent Length field is set to zero. (continued) Scope-Specific Address Quantum Atlas 10K II Ultra160/m SCSI Hard Disk Drives 5­117 SCSI Description PERSISTENT RESERVATION IN Command (5Eh) (continued) Table 5­55 PERSISTENT RESERVATION IN Read Reservations Descriptor -- Field Descriptions (continued) Data Field Scope Description 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 0h Name LU Description Logical Unit. Persistent reservation applies to the full logical unit. The LU scope is therefore implemented by all device servers that implement PERSISTENT RESERVATION OUT. Persistent reservation applies to the specified extent. When Extent is the scope, it indicates that the persistent reservation applies to the extent of the logical unit defined by the ScopeSpecific Address and Extent Length fields in the PERSISTENT RESERVATION OUT command's parameter list. [. . . ] Specifically, it provides the codes and meanings for the Transfer Period Factor field (byte 4) and a table that explains the allowable settings for the QAS, DT, and IU fields (bits 2, 1, and 0, respectively, of byte 7). C. 1 TRANSFER PERIOD FACTOR FIELD Table C-1 provides the codes and meanings allowed for the Transfer Period Factor field if the value of PARL (Parallel Protocol, bit 2 of byte 6 of the Negotiated Rate Information Page) is 1. Table C-2 provides the allowable codes when the value of PARL = 0. Table C­1 Transfer Period Factor Field Values When PARL = 1 Code 00h ­ 08h 09h Description Reserved. Transfer period = 12. 5 ns (Fast-80 is latched every 12. 5 ns). [. . . ]