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. [. . . ] Refer to Table 5-56 for the applicable Type codes and their meanings 5­118 Quantum Atlas 10K II Ultra160/m SCSI Hard Disk Drives SCSI Description PERSISTENT RESERVATION IN Command (5Eh) (continued) Table 5-56 presents the definitions of the characters of the available "Type" values 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). Table 5­56 Persistent Reservation Type Codes and Their Meanings Code 0h Name READ Shared Description READS: Shared; any application client on any initiator may execute commands that perform transfers from the disk to the initiator. WRITES: Prohibited; any command from any initiator that performs a transfer from the initiator to the disk results in a reservation conflict. ADDITIONAL RESERVATIONS: Allowed; any initiator may reserve the logical unit, extents, or elements as long as the persistent reservations do not conflict with any reservations already known to the device server. 1h WRITE Exclusive READS: Shared; any application client on any initiator may execute commands that perform transfers from the disk to the initiator. WRITES: Exclusive; any command from any initiator other than the initiator that holds the persistent reservation that attempts a transfer to the disk results in a reservation conflict ADDITIONAL RESERVATIONS: Allowed; any initiator may reserve the logical unit, extents, or elements as long as the persistent reservations do not conflict with any reservations already known to the device server. 2h READ Exclusive READS: Exclusive; any command from any initiator other than the initiator that holds the persistent reservation that attempts a transfer from the disk results in a reservation conflict WRITES: Shared; any application client on any initiator may execute commands that perform transfers to the disk from the initiator. ADDITIONAL RESERVATIONS: Allowed; any initiator may reserve the logical unit, extents, or elements as long as the persistent reservations do not conflict with any reservations already known to the device server. (continued) Quantum Atlas 10K II Ultra160/m SCSI Hard Disk Drives 5­119 SCSI Description PERSISTENT RESERVATION IN Command (5Eh) (continued) Table 5­56 Persistent Reservation Type Codes and Their Meanings (continued) Code 3h Name Exclusive Access Description READS: Exclusive; any command from any initiator other than the initiator holding the persistent reservation that attempts a transfer from the disk results in a reservation conflict. WRITES: Exclusive; any command from any initiator other than the initiator holding the persistent reservation that attempts a transfer to the disk results in a reservation conflict. ADDITIONAL RESERVATIONS: Restricted; any PERSISTENT RESERVATION OUT command with the Reserve service action from any initiator other than the initiator holding the persistent reservation results in a reservation conflict. The initiator that holds the persistent reservation can reserve the logical unit, extents, or elements as long as the persistent reservations do not conflict with any reservations already known to the device server. 4h Shared Access READS: Shared; any application client on any initiator may execute commands that perform transfers from the disk to the initiator. WRITES: Shared; ; any application client on any initiator may execute commands that perform transfers to the disk from the initiator. ADDITIONAL RESERVATIONS: Restricted; any PERSISTENT RESERVATION OUT command with the Reserve service action from any initiator other than the initiator holding the persistent reservation results in a reservation conflict. The initiator that holds the persistent reservation can reserve the logical unit, extents, or elements as long as the persistent reservations do not conflict with any reservations already known to the device server. 5h WRITE Exclusive, Registrants Only READS: Shared; any application client on any initiator may execute commands that perform transfers from the disk to the initiator. WRITES: Exclusive; any command from an initiator that has not previously performed a Register service action with the device server that attempts a transfer to the disk results in a reservation conflict ADDITIONAL RESERVATIONS: Allowed; any initiator may reserve the logical unit, extents, or elements as long as the persistent reservations to not conflict with any reservations already known to the device server. (continued) 5­120 Quantum Atlas 10K II Ultra160/m SCSI Hard Disk Drives SCSI Description PERSISTENT RESERVATION IN Command (5Eh) (continued) Table 5­56 Persistent Reservation Type Codes and Their Meanings (continued) Code 6h Name Exclusive Description READS: Exclusive; any command from an initiator that has not previously performed a Register service action with the device server that attempts a transfer from the disk results in a reservation conflict. WRITES: Exclusive; any command from an initiator that has not previously performed a Register service action with the device server that attempts a transfer to the disk results in a reservation conflict ADDITIONAL RESERVATIONS: Registrants Only Allowed; any initiator may reserve the logical unit, extents, or elements as long as the persistent reservations to not conflict with any reservations already known to the device server. 7h - Fh Reserved N/A Quantum Atlas 10K II Ultra160/m SCSI Hard Disk Drives 5­121 SCSI Description PERSISTENT RESERVATION IN Command (5Eh) (continued) Table 5-57 represents graphically all possible combinations of Persistent Reservations Being Attempted when Persistent Reservations are already held for each of the types of persistent reservations. Table 5-57 When Do Conflicts Between Existing Reservations and New Reservations Exist? Persistent Reservation Already Held Persistent Reservation Being Attempted READ Shared LU EX WRITE Exclusive LU EX READ Exclusive LU EX Exclusive Access * LU EX Shared Access * LU EX WRITE Exclusive RO LU EX Exclusive Access RO LU EX LU READ Shared N N Y Y Y Y Y Y N N Y Y N N Y O Y O Y O N N Y O Y Y Y Y Y Y Y Y Y Y Y Y Y O Y O Y O Y O Y O Y O Y Y Y Y Y Y Y Y Y Y Y Y Y O Y O Y O Y O Y O Y O Y Y Y Y Y Y Y Y Y Y Y Y Y O Y O Y O Y O Y O Y O N N Y Y Y Y Y Y N N Y O N N Y O Y O Y O N N Y O Y Y Y Y Y Y Y Y Y Y N N Y O Y O Y O Y O Y O N N Y Y Y Y Y Y Y Y Y Y N N Y O Y O Y O Y O Y O N N EX LU WRITE Exclusive EX LU READ Exclusive EX LU Exclusive Access * EX LU Shared Access * EX LU WRITE Exclusive RO EX LU Exclusive Access RO Y Y Y O Y Y Y O Y Y Y O Y Y Y O Y Y Y O N N N N N N N N EX KEY: LU = Logical Unit Scope EX = Extent or Element Scope RO = Registrants Only * = Conflicts with all reservation requests from other initiators. N = No Conflict Y = Conflict O = Conflict occurs if extent or element overlaps with existing extent or element reservation. 5­122 Quantum Atlas 10K II Ultra160/m SCSI Hard Disk Drives SCSI Description 5. 19 PERSISTENT RESERVATION OUT Command (5Fh) The PERSISTENT RESERVATION OUT command is a 10-byte command used to reserve a logical unit or an extent within a logical unit for the exclusive or shared use by an initiator. The command is used in conjunction with the PERSISTENT RESERVATION IN command; it is not used with the RESERVE and RELEASE commands. Persistent reservations conflict with reservations made via the RESERVE command. Initiators that perform PERSISTENT RESERVATION OUT actions are identified by a reservation key assigned by the application client. The client may use the PERSISTENT RESERVATION IN command to identify which other initiators within a system hold conflicting or invalid persistent reservations and use the PERSISTENT RESERVATION OUT command to preempt those reservations if necessary. [. . . ] An DT_REQ bit = 1 indicates that DT DATA phases are to be enabled when received from the originator and that DT DATA phases received from the responding device are supported. A QAS Enable Request (QAS_REQ) = 0 indicates that QAS is to be disabled when received from the originator and QAS received from the responding SCSI device is not supported. An QAS_REQ bit = 1 indicates that QAS is to be enabled when received from the originator and that QAS received from the responding device are supported. The Atlas 10K II disk drive supports two operating modes selected via the Protocol Option Bits: QAS_REQ DT_REQ 0 0 IU_REQ Description 0 Use ST data-in buffer transfers and ST data-out buffer transfers to transfer data. [. . . ]