Browse Prior Art Database

Media Analysis For IBM AS/400 Computer

IP.com Disclosure Number: IPCOM000106350D
Original Publication Date: 1993-Oct-01
Included in the Prior Art Database: 2005-Mar-21
Document File: 4 page(s) / 86K

Publishing Venue

IBM

Related People

Koski, DD: AUTHOR [+2]

Abstract

Disclosed is a method for determining if removable computer media for IBM as/400* should be discarded based on lifetime volume statistics. The statistics are calculated for a unique tape volume identifier and compared to published error rate criteria. User friendly indicators point out potentially bad media to the user.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Media Analysis For IBM AS/400 Computer

                        Work with Lifetime Statistics


  Removable media . . . . . . :   1/4 inch cartridge tape

  Type options, press Enter.
   4=Delete entry   6=Print entry


          Volume      --------Errors--------     --------K Bytes-------
  Option  ID                Read       Write           Read     Written
        >>PHB021         9956730       27432       12347123     9900090
        >>THB021           58902     2345566       98984307     8299000
         >AIPL               367         230         789999      999009
          MM                   1           0            361           0
          PTFFIX               0           0              3         432
          RICH                 0           0            398           0


      Disclosed is a method for determining if removable computer
media for IBM as/400* should be discarded based on lifetime volume
statistics.  The statistics are calculated for a unique tape volume
identifier and compared to published error rate criteria.  User
friendly indicators point out potentially bad media to the user.

      A removable media analysis algorithm is shown below.  Lifetime
volume statistics for each piece of media used are kept on a computer
and used for this analysis.  The algorithm compares the actual
lifetime media volume statistics to predefined media error rates
(based on the type of media).  4-byte hexadecimal operational and
error counters are compared, first to ensure that a minimum number of
operations have occurred (i.e., 400,000 ) and then to the predefined
rates.  Symbols ( > and  >> ) are used to flag any media that exceeds
the criteria.

Algorithm Description - For each unique Media Volume Identifier, do
the following:

1.  Add total Read_Operations + total Write_Operations and Compare
    Result to the Minimum_Operations_Parameter.

2.  If Result exceeds Parameter, then continue, else end

3.  Determine the Type of Media Device

4.  For the each different Media Device Type, do the following:

    a.  Multiply the Read_Errors (for the Volume ID) times the
        Read_Error_ Rate_Replace_Parameter (for the Media Device
        Type) and Compare the Result to the total Read_Operations
        (for the Volume ID)

    b.  If Result exceeds Read_Operations, Flag the Volume for
        Replacement.

    c.  Else, Multiply the Write_Errors (for the Volume ID) times the
        Write_ Erro...