Browse Prior Art Database

Head Disk Assembly Drawer Device Level Trace Interface

IP.com Disclosure Number: IPCOM000115718D
Original Publication Date: 1995-Jun-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 4 page(s) / 90K

Publishing Venue

IBM

Related People

Chen, SD: AUTHOR

Abstract

A secondary interface is created within the drawer device electronics for trace data storage and retrieval, for performance measurement information, for monitoring of the device characteristics e.g., HDA preventive analysis, and for any other drive physical data gathering. All of these are done via the second front, not through the standard product interface.

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Head Disk Assembly Drawer Device Level Trace Interface

      A secondary interface is created within the drawer device
electronics for trace data storage and retrieval, for performance
measurement information, for monitoring of the device characteristics
e.g., HDA preventive analysis, and for any other drive physical data
gathering.  All of these are done via the second front, not through
the standard product interface.

3990 Illustration - As depicted in the following picture, 3990
control unit fetches its trace data through the product interface
from the drawer electronics and routes to its SF disk for logging.

934X Illustration - 934X products fetch the trace data also through
the product interface then back down again through another product
interface to device support tracks that are located on a designated
device address.

Current vendor products - Vendor DASD products, which basically are
plug compatible to our products, follow the similar path like 3990
way of logging data.

      Various levels of implementation can be done with this new
interface.  It is depends on the cost and level of trace
sophistication required.

      The basic path exists on current day Digital Signal Processor
inside the device electronics.  Sharing with existing DSP code
storage memory space and partitioned it out to be used for logic
dump.  In some instance, this required the use of faster speed solid
state memory like the flash.

      This level of implementation requires physical accessing of the
solid state memory for log data.

      To reach the outside world more readily, th...