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1、ANSI INCITS 314-1998 (R2003) (formerly ANSI NCITS 314-1998) for Information Technology SCSI-3 Medium Changer Commands (SMC) Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 04/29/2007 20:0
2、9:14 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 04/29/2007 20:09:14 MDTNo reproduction or networking permitt
3、ed without license from IHS -,-,- ANSI NCITS 314-1998 American National Standard for Information Technology SCSI-3 Medium Changer Commands (SMC) Secretariat Information Technology Industry Council Approved May 19, 1998 American National Standards Institute, Inc. Abstract This standard defines the SC
4、SI commands and model for independent medium changer devices and at- tached medium changer functions integrated into other SCSI devices. Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 04
5、/29/2007 20:09:14 MDTNo reproduction or networking permitted without license from IHS -,-,- Approval of an American National Standard requires review by ANSI that the requirements for due process, consensus, and other criteria for approval have been met by the standards developer. Consensus is estab
6、lished when, in the judgement of the ANSI Board of Standards Review, substantial agreement has been reached by directly and materially affected interests. Substantial agreement means much more than a simple majority, but not necessarily unanimity. Consensus requires that all views and objections be
7、considered, and that a concerted effort be made towards their resolution. The use of American National Standards is completely voluntary; their existence does not in any respect preclude anyone, whether he has approved the standards or not, from manufacturing, marketing, purchasing, or using product
8、s, processes, or procedures not conforming to the standards. The American National Standards Institute does not develop standards and will in no circumstances give an interpretation of any American National Standard. Moreover, no person shall have the right or authority to issue an interpretation of
9、 an American National Standard in the name of the American National Standards Institute. Requests for interpretations should be addressed to the secretariat or sponsor whose name appears on the title page of this standard. CAUTION NOTICE: This American National Standard may be revised or withdrawn a
10、t any time. The procedures of the American National Standards Institute require that action be taken periodically to reaffirm, revise, or withdraw this standard. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Sta
11、ndards Institute. American National Standard Published by American National Standards Institute, Inc. 11 West 42nd Street, New York, NY 10036 Copyright 1998 by Information Technology Industry Council (ITI) All rights reserved. No part of this publication may be reproduced in any form, in an electron
12、ic retrieval system or otherwise, without prior written permission of ITI, 1250 Eye Street NW, Washington, DC 20005. Printed in the United States of America CAUTION: The developers of this standard have requested that holders of patents that may be required for the implementation of the standard dis
13、close such patents to the publisher. However, neither the developers nor the publisher have undertaken a patent search in order to identify which, if any, patents may apply to this standard. As of the date of publication of this standard and following calls for the identification of patents that may
14、 be required for the implementation of the standard, no such claims have been made. No further patent search is conducted by the de- veloper or publisher in respect to any standard it processes. No representation is made or implied that licenses are not required to avoid infringement in the use of t
15、his standard. Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 04/29/2007 20:09:14 MDTNo reproduction or networking permitted without license from IHS -,-,- i Contents Page Foreword.iv Int
16、roduction vii 1 Scope 1 2 Normative references . 3 3 Definitions, symbols and abbreviations. 4 3.1 Definitions . 4 3.2 Symbols and abbreviations. 7 3.3 Keywords 7 3.4 Conventions 8 4 Overview. 9 5 Medium changer models 11 5.1 Independent medium changer 11 5.2 Attached medium changer 11 5.3 Medium ch
17、anger elements 11 5.4 Medium transport element 12 5.5 Storage element 13 5.6 Import/export element. 13 5.7 Data transfer element 13 5.8 Element status maintenance requirements. 14 5.9 Volume tag information . 14 5.10 Primary and alternate volume tag information 15 5.11 Volume tag information format
18、15 6 Commands for medium changer logical units. 16 6.1 EXCHANGE MEDIUM command 18 6.2 INITIALIZE ELEMENT STATUS command 20 6.3 MOVE MEDIUM command . 21 6.4 POSITION TO ELEMENT command 23 6.5 READ ELEMENT STATUS command 24 6.5.1 Element status data . 25 6.5.2 Element status page 26 6.5.3 Medium trans
19、port element descriptor. 27 6.5.4 Storage element descriptor 29 6.5.5 Import/export element descriptor . 30 6.5.6 Data transfer element descriptor 32 6.5.7 Identification descriptor 34 6.6 RELEASE ELEMENT (6) command . 35 6.6.1 Logical unit release (Mandatory) . 35 6.6.2 Element release (Optional) 3
20、5 6.7 RELEASE ELEMENT (10) command . 36 6.7.1 Third-party release (Mandatory). 36 6.8 REQUEST VOLUME ELEMENT ADDRESS command . 37 6.9 RESERVE ELEMENT (6) command. 40 6.9.1 Logical unit reservation (Mandatory) 40 6.9.2 Element reservation (optional) . 41 6.10 RESERVE ELEMENT (10) command. 42 Copyrigh
21、t American National Standards Institute Provided by IHS under license with ANSI Licensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 04/29/2007 20:09:14 MDTNo reproduction or networking permitted without license from IHS -,-,- ii Page 6.10.1 Third-party reservation (Mandatory). 4
22、3 6.10.2 Superseding reservations 43 6.11 SEND VOLUME TAG command. 45 7 Parameters. 49 7.1 Diagnostic parameters 49 7.2 Log parameters. 49 7.3 Mode parameters 50 7.3.1 Device capabilities page 51 7.3.2 Element address assignment page 53 7.3.3 Transport geometry parameters page 54 Tables 1Volume tag
23、information format . 15 2Commands for independent medium changers . 16 3Commands for attached medium changers . 17 4EXCHANGE MEDIUM command. 18 5 INITIALIZE ELEMENT STATUS command 20 6MOVE MEDIUM command 21 7POSITION TO ELEMENT command 23 8READ ELEMENT STATUS command 24 9Element type code 25 10Eleme
24、nt status data 25 11Element status page 26 12Medium transport element descriptor. 27 13Storage element descriptor 29 14Import/export element descriptor 30 15Data transfer element descriptor 32 16Identification descriptor fields. 34 17RELEASE ELEMENT (6) command. 35 18RELEASE ELEMENT (10) command. 36
25、 19RELEASE ELEMENT (10) parameter list. 37 20REQUEST VOLUME ELEMENT ADDRESS command. 38 21Volume element address header . 39 22RESERVE ELEMENT (6) command 40 23 Data format of element list descriptors. 42 24RESERVE ELEMENT (10) command 43 25RESERVE ELEMENT (10) ID equivalent to the phrase “it is str
26、ongly recommended“. 3.4 Conventions Certain words and terms used in this standard have a specific meaning beyond the normal English meaning. These words and terms are defined either in 3.1 or in the text where they first appear. Names of commands, statuses, sense keys, additional sense codes, and ad
27、ditional sense code qualifiers are in all uppercase (e.g., REQUEST SENSE). Field names and bit names are in SMALL CAPS. Lower case is used for words having the normal English meaning. Fields containing only one bit are usually referred to as the name bit instead of the name field. Numbers that are n
28、ot immediately followed by lowercase b or h are decimal values. Numbers immediately followed by lowercase b (xxb) are binary values. Numbers or upper case letters immediately followed by lowercase h (xxh) are hexadecimal values. Lists sequenced by letters (e.g., a-red, b-blue, c-green) show no prior
29、ity relationship between the listed items. Numbered lists (e.g., 1-red, 2-blue, 3-green) show a priority ordering between the listed items. If a conflict arises between text, tables, or figures, the order of precedence to resolve the conflicts is text; then tables; and finally figures. Not all table
30、s or figures are fully described in the text. Tables show data format and values. NOTES do not constitute any requirements for implementors. Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale
31、, 04/29/2007 20:09:14 MDTNo reproduction or networking permitted without license from IHS -,-,- ANSI NCITS 314-1998 9 4 Overview The SCSI-3 medium changer device class specifies a logical unit that is involved, primarily, with the movement of removable volumes in a controlled environment without hum
32、an intervention. The SCSI-3 device classes that provide for removable volumes are block, multi-media and sequential. (See the SBC, MMC and SSC standards.) A medium changer logical unit receives commands to move volumes between various element types in the element address space of the medium changer.
33、 The element types are storage, data transfer, medium transport, and import/export. A volume handling robotic subsystem, addressed as a medium transport element, moves volumes within a medium changer. A medium changer logical unit maintains an inventory of volumes and the element address where they
34、can be found. The medium changer logical unit reports this inventory when requested as well as identifying the element addresses assigned to different types of elements. Different levels of sophistication may be implemented in how this inventory is managed, reported, detected and maintained. The ele
35、ments in a medium changer may be reserved to different initiators. For example, one data transport element may be reserved for exclusive use by one initiator. The primary device, located at that data transfer element, may then be attached to various systems for their use. In some cases, the primary
36、device associated with a data transfer element may not be an SCSI device. The split between load and unload control of the medium and read and write control by a primary device is a key feature of this device class. The mechanism for coordinating this kind of sophisticated activity is not specified
37、in this standard. The medium changer device class provides the means for mount/dismount management only. Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 04/29/2007 20:09:14 MDTNo reproduc
38、tion or networking permitted without license from IHS -,-,- ANSI NCITS 314-1998 10 Figure 2 shows an example of an independent medium changer. The data transfer elements (primary devices) shown may be any type of removable media device such as a tape drive, disk drive or optical drive. Supporting mu
39、ltiple types of removable media within the same medium changer is also permitted. Also, the ports on each primary device may or may not attach to the same service delivery subsystem and the interfaces to the primary devices may or may not be SCSI. The number and arrangement of elements is arbitrary.
40、 Figure 2 - Example independent medium changer device The independent changer model applies to implementations where the medium changer is addressed as a separate logical unit. The logical unit for the medium changer may be accessed via the same SCSI ID as the primary device, or via a different SCSI
41、 ID. This type of medium changer may support more than one primary device. The attached medium changer model permits a subset of the functions of an independent changer to be incorporated directly into a primary device. Only one data transport element is permitted. In this case, only one logical uni
42、t is used to access all functions. A medium changer moves volumes among the several element types accessible to it on command from an initiator. Medium changers shall be capable of reporting the full or empty status of any element address in its domain. Copyright American National Standards Institut
43、e Provided by IHS under license with ANSI Licensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 04/29/2007 20:09:14 MDTNo reproduction or networking permitted without license from IHS -,-,- ANSI NCITS 314-1998 11 5 Medium changer models 5.1 Independent medium changer An independen
44、t medium changer is a device server that returns 8h in the PERIPHERAL DEVICE TYPE field (see SPC) of INQUIRY command response data. Independent medium changers for the SMC standard respond to a LUN different from those used by a primary device. Communication with a primary device may use the same se
45、rvice delivery subsystem as the medium changer device, or a different SCSI service delivery subsystem. Primary devices that are not SCSI devices are also permitted. Multiple primary devices may be attached to an independent changer. If a primary device served by the medium changer is an SCSI device,
46、 the primary device may be addressed on an SCSI-3 service delivery subsystem though the same port as the medium changer but with a different LUN or the primary device may be addressed through independent ports and any LUN on the same or a different service delivery subsystem. The READ ELEMENT STATUS
47、 command response data page for each data transfer element may provide the identity of the primary device serviced by a medium changer device. This support is optional since a primary device is not required to be an SCSI-3 device. 5.2 Attached medium changer An attached medium changer is part of a d
48、evice server that sets the MCHNGR bit to one in its standard INQUIRY data (see SPC). Attached medium changers respond to the same LUN as a primary device that is not a medium changer. In an attached medium changer, the PERIPHERAL DEVICE TYPE field of INQUIRY command response data returns the type of the primary device. Two medium changer commands, READ ELEMENT STATUS ATTACHED and MOVE MEDIUM ATTACHED are added to the command set of the primary device. The other commands available depend on the model for the primary device. 5.3 Medium changer elements A mediu