The Direct Access Media Reliability Report provides a summary
of the reliability of direct access volumes based on the
ratio of volume usage to the number of errors encountered on
the volume. The usage is measured in both accesses or seeks
and the number of bytes transferred or read from the volume.
The objective of the report is to highlight the volumes that
have a low ratio of usage to errors.
The error ratios provide a calculated measure of the failure
rate based on the type of usage per failure. For example, a
low ratio of seeks per seek error could be an indication of a
problem.
The information provided in the Direct Access Media
Reliability Report includes the following:
VOLUME SERIAL - the six-character serial number of the
direct access volume.
LOGICAL ADDRESS - the four hexadecimal character
logical address of the device used for the volume.
This will be the last logical address used for the
volume serial.
USAGE COUNTS - the number of seek accesses performed on
the volume (in 000s) and the number of data bytes
read from the volume (in 000000s).
ERROR COUNTS - the number of seek checks, read retries,
and ECC correctable errors for the volume. The
number of seek checks is the number of times a
seek operation was incomplete as the result of an
error. Read retries counts the number of times a
read error was corrected by a retry of the read
operation. ECC correctable errors counts the
number of times a read operation was corrected by
the error checking and correction hardware.
A potential problem is indicated by any large
number of seek checks, read retries, or ECC
correctable errors. The read retry count and ECC
error count represent recoverable read errors.
The following information is provided for the current and a
previous period of time:
NO. OF SEEKS/SEEK CK - is the ratio of the number of seek
operations performed to the number of seek errors
encountered.
TEMP ERRORS/MB READ - is the ratio of the number of
temporary errors (total read retries plus ECC
correctable errors) to the number of bytes read.
INQUIRY ID:
SRLLS4
DATA SOURCE (file/timespan):
SRLDMR at the DETAIL or DAYS timespan.
DATA ELEMENTS USED:
Following is the data element used for this inquiry:
___________________________________________________________
| | |
| FILE | DATA ELEMENTS |
|__________|_______________________________________________|
| | |
| SRLDMR | DMRSERCT DMRUCDCK DMRCODCK DMRSEKCT DMRBYTCT |
| | |
| | |
|__________|_______________________________________________|
CA 11:01 TUESDAY MAY 6, 2008 1 CA MICS I/S MANAGEMENT SUPPORT SYSTEM DIRECT ACCESS MEDIA RELIABILITY | DEVTYPE TYPE 3380 | ----------------------------------------------------------------------------------------------------------------------------------+ | | | | TUE 06MAY08 - TUE 06MAY08 | TUE 29APR08 - MON 05MAY08 | VOLUME SERIAL | LOGICAL | USAGE COUNTS | ERROR COUNTS | NO. OF SEEKS MB READ / | NO. OF SEEKS MB READ / | | ADDRESS | SEEKS MB/READ | SEEK CK RD RETRY ECC CORR | / SEEK CK TEMP ERR | / SEEK CK TEMP ERR | ---------------+---------+-----------------+------------------------------+---------------------------+---------------------------+ PAG440 | 0440 | 20054 707.85 | 0 6 0 | 0 117.98 | 0 225.62 | TMPDEV | 0340 | 162560 218.10 | 0 0 8 | 0 27.26 | 0 57.32 | TSO176 | 09D2 | 14 0.80 | 1 0 0 | 14 0.00 | 0 0.49 | SYSMPA | 02A1 | 15760 135.94 | 0 0 1 | 0 135.94 | 0 0.00 | XMP482 | 0958 | 32512 186.65 | 0 0 55 | 0 3.39 | 0 5.93 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | ----------------------------------------------------------------------------------------------------------------------------------+
Figure 3-9. Direct Access Media Reliability Report
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