Number: 2123

Date: 10-Sep-84 18':30':39

Submitter: Le.pasa


Subject: Unmappable 1100 Disk Errors

Assigned To: 

Attn: MASINTER.PA, vanMelle

Status: Open


Problem Type: Performance

Impact: Fatal


Frequency: Intermittent

Priority: Absolutely

System: Operating System

Subsystem: Dolphin/Dorado Disk

Machine: 1108


Lisp Version: 21-Jun-84 10':50':28

Source Files: 

Microcode Version: 5124

Memory Size: 3071

File Server: 

Server Software Version: 

Disposition: '
["Sannella.PA" "11-Sep-84 13':14':21" Attn': Status':(New->Open) Priority':(->Absolutely) System':(->Operating% System) Subsystem':(->Dolphin/Dorado% Disk)]

Description:  Date': Tue, 24 Jul 84 17':10 PDT'
Subject': Unmappable 1100 Disk Errors'
To': 1100Support.pasa'
cc':, Agadoni.pasa, Norton.pasa, Vaughan.pasa, Logan.pasa'
XSIS Field Service, along with SPG Manufacturing, have been encountering 1100 hard disk errors, that couldn''t successfully be mapped out.  When BFS Test encounters an error three or more times, during the disk certify, it will map it out at the end.  In about 90% of the cases this works fine.  We run into trouble when BFS Test says a bad spot has been marked, and Scavenger continues to find this spot bad (after a complete disk software loadup.)  Scavenger will usually complain that it as encountered a "Hard Disk Error", and that the page was "Incorrigible".  Some of these disk drives have been sent back to Shugart for media replacement, but Shugart claims the disks meet specifications.'
Could anyone give me an idea of what is taking place during the BFS Certify?'
Are there certain types of disk errors that can''t be mapped out?'
Any information or possible solutions to this continuing problem, will be greatly appreciated, since there are many unusable disk drives being endlessly recycled, and kept out of circulation.'
Tom Logan'


Test Case: 

Edit-By: Sannella.PA

Edit-Date: 11-Sep-84 13':14':22