rfc1564.txt

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Network Working Group                                          P. Barker
Request for Comments: 1564                     University College London
Category: Informational                                       R. Hedberg
                                              Technical University Delft
                                                            January 1994


                              DSA Metrics
                            (OSI-DS 34 (v3))

Status of this Memo

   This memo provides information for the Internet community.  This memo
   does not specify an Internet standard of any kind.  Distribution of
   this memo is unlimited.

Abstract

   This document defines a set of criteria by which a DSA implementation
   may be judged.  Particular issues covered include conformance to
   standards; performance; demonstrated interoperability.  The intention
   is that the replies to the questions posed provide a fairly full
   description of a DSA. Some of the questions will yield answers which
   are purely descriptive; others, however, are intended to elicit
   answers which give some measure of the utility of the DSA. The marks
   awarded for a DSA in each particular area should give a good
   indication of the DSA's capabilities, and its suitability for
   particular uses.

   Please send comments to the authors or to the discussion group
   <[e-mail]>.

Table of Contents

   1.   Overview                                                      2
   2.   General Information                                           3
   3.   Conformance to OSI Standards                                  4
        3.1    Directory protocols.............................       4
        3.2    Implementors' agreements and profiles  .........       6
        3.3    Protocol stacks.................................       6
        3.4    DIT structure  .................................       7
   4.   Other protocols                                               7
   5.   Extensions to the 1988 Standard                               7
        5.1    Schema .........................................       7
        5.2    Support for replication.........................       8
        5.3    Support for access control .....................       8
        5.4    Miscellaneous  .................................       9
   6.   Miscellaneous characteristics                                10



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   7.   Management tools                                             11
        7.1    Dynamic system management  .....................      11
        7.2    Static system management  ......................      12
        7.3    Data management.................................      12
   8.   Operational Use                                              12
   9.   Interoperability                                             12
   10.  Performance                                                  13
        10.1   Speed for various operations  ..................      14
            10.1.1   Bind .....................................      14
            10.1.2   List .....................................      15
            10.1.3   Search  ..................................      15
            10.1.4   Read .....................................      16
            10.1.5   Add entry.................................      16
            10.1.6   Modify entry .............................      16
            10.1.7   Modify RDN  ..............................      16
            10.1.8   Query rate  ..............................      17
        10.2   The results.....................................      17
        10.3   Environment used for benchmarking  .............      17
   11. Security Considerations                                       21
   12. Authors' Addresses                                            21

1.  Overview

   The purpose of this document is to define some metrics by which DSA
   products can be measured.  Such metrics are valuable as whilst an
   X.500 DSA must conform to the specification in the standard - this is
   a sine qua non - protocol conformance is not in itself the hallmark
   of a usable implementation.  A DSA must perform operations within a
   reasonable time; a DSA must offer good throughput of queries; a DSA
   must be able to handle a reasonable volume of data; if modification
   operations are provided, some sort of access control must be
   provided; a DSA and its data must be manageable.

   In many respects, it is almost impossible to say that one DSA is
   better than other from looking at the responses to questions in this
   document.  For some, the cost or level of support will be the key
   criterion.  For another user, the flexibility of the schema
   management facilities, or the feasibility of running the DSA over an
   existing relational database, will be of prime importance.  In many
   respects DSAs will just be different, rather than better or worse.
   However, all other things being equal, the look-up speed of a DSA is
   very obviously measurable, and there is a substantial number of
   questions on the speed of the various X.500 operations, and in
   particular on the look-up operations.

   Throughout this document, some of the questions posed are annotated
   with a square-bracketed points score and an explanation as to how the
   points should be allocated.  For example, a question might be



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   appended with "[2 if yes]", indicating score 2 points for an
   affirmative answer to that question.  These points scores should be
   collated in Table 1 at the end of the document.  The questions on DSA
   performance are judged to be important enough to have a separate
   table for those results:  they appear in Table 2 (and optionally
   Table 3).  Together, these tables constitute a measure of the DSA.

   The metrics are on a section by section basis, which should help the
   reader who is seeking, for example, a DSA with fast look-up
   capabilities and extensive access control facilities, to focus on the
   critical aspects of a DSA for their particular requirement.  No
   conclusions should be inferred from adding the scores together into
   one overall grand total and comparing such totals for different DSAs,
   as no attempt is made to assign weights to the different
   characteristics.

   Whilst much of this document should usually be completed by the
   developers or suppliers of an implementation, the section on
   performance could be completed by anyone running the implementation.
   Indeed, it will be beneficial if several sets of performance figures
   can be gathered for each implementation, for a variety of hardware
   platforms.

2.  General Information

   This section contains general information about the implementation
   under discussion.

   1.  Name of the information provider ................................
    ....................................................................

   2.  Name of the implementation ......................................

   3.  Version number of the DSA described in this document ............

   4.  Are there plans to implement the additional features describe in
       the 1992/3 standard?  [6 for full implementation, 4 if both
       access control and replication to be implemented, 2 for some
       1992 features] ..................................................

   5.  Name and address of supplier or person to contact ...............
    ....................................................................
    ....................................................................
    ....................................................................
    ....................................................................
    ....................................................................
    ....................................................................




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   6.  Describe the hardware and software platforms supported by the DSA
       [up to 4 points may be awarded for this question]

      (a)  Hardware (If appropriate, can summarise as, for example
           "generic UNIX platform") ..................................

      (b)  O/S (state version if critical)

           i.  UNIX) (be sure to indicate which flavour - e.g.,
               SYSV [1], BSD [1], SUNOS, etc) ..........................

          ii.  VMS) [1] ................................................

         iii.  MS-DOS [1] ..............................................

          iv.  Macintosh [1] ...........................................

           v.  Other) [1] ..............................................

   7.  Name any other software required to run the system which is not
       supplied with the operating system or with the DSA software
       itself.  Examples might include a database package, or
       communications software .........................................
    ....................................................................

   8.  Is this DSA an integrated part of a software package, and in such
       case which ?  ...................................................
    ....................................................................

   9.  Is the software free?  If the DSA needs other packages, are these
       also freely available?  [3 if completely free, 1 if requires
       commercial software package] ....................................
    ....................................................................

   10. Is commercial support available for this implementation?  [3] ...

   11. Is free, best effort support available from the developers?  [2].

   12. Is free support available via user groups or email lists?  [2] ..

3.  Conformance to OSI Standards

3.1  Directory protocols

   13. Does the DSA implement DAP?

      (a)  Read ASE? [2] ...............................................




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      (b)  Search ASE? [2] .............................................

      (c)  Modify ASE? [2] .............................................

   14. Does the DSA implement DSP?

      (a)  Chained read ASE? [2] .......................................

      (b)  Chained search ASE? [2] .....................................

      (c)  Chained modify ASE? [2] .....................................

   15. Statement requirements according to section 9.2.1 in X.519.

      (a)  Supported application-contexts?  ............................

      (b)  Capable of acting as first-level DSA? [1] ...................

      (c)  Chained mode supported?  [1] ................................

      (d)  Security-level(s) supported?  [1 for strong + 1 for protected
           simple + 1 for simple authentication] .......................

      (e)  All attribute types according to X.520?  [1] ................

      (f)  All object classes according to X.521?  [1] .................

   16. Does the implementation meet the conformance clauses in section
       9.2.2 and 9.2.3 of X.519?
       Static requirements [2 if yes on all]

      (a)  Abstract syntaxes of application contexts ...................

      (b)  Abstract syntaxes of information framework ..................

      (c)  Minimal knowledge ...........................................

      (d)  Support of root context .....................................

      (e)  Abstract syntax - attribute types ...........................

      (f)  Abstract syntax - object classes ............................

       Dynamic requirements [2 if yes on all]

      (a)  Mapping onto underlying services ............................

      (b)  Distributed operations - referrals ..........................



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      (c)  DirectoryAccessAC - referrals ...............................

      (d)  DirectorySystemAC - referrals ...............................

      (e)  Chained mode ................................................

   17. Please list all conformance testing work applied to the
       implementation (specify conformance test version number).  [2 if
       any testing]