[1187] in linux-scsi channel archive
Update (Re: medium error, what next?)
daemon@ATHENA.MIT.EDU (Stephen R. van den Berg)
Sun Dec 29 09:31:00 1996
From: srb@cuci.nl (Stephen R. van den Berg)
Date: Sun, 29 Dec 1996 15:27:35 +0100
In-Reply-To: Gerard Roudier's message as of 1996 Dec 21 Sat 9:52.
<Pine.LNX.3.91.961221093107.98A-100000@localhost>
To: linux-scsi@vger.rutgers.edu, ncr53c810@colorado.edu
Well, I thought I'd wait a little to see if the drive stays stable...
But I think I can now say that it looks pretty good.
This is the drive:
ncr53c810-0-<target 3, lun 0>: using tagged command queueing, up to 4 cmds/lun
Vendor: IBM Model: DPES-31080 Rev: S31Q
Type: Direct-Access ANSI SCSI revision: 02
Detected scsi disk sdd at scsi0, channel 0, id 3, lun 0
Strangely scsiinfo shows that AWRE and ARRE were both on (I didn't change
any of the drive parameters). Nonetheless, simply reading the entire
drive did not result in the faulty sectors being relocated.
(BTW, I still don't know what AWRE and ARRE exactly enable and/or disable).
Simply writing the relevant sectors (two spots, eventually) made the error
go away (I simply wrote through the buffer system on Linux, then sync
afterward). The strange thing is that the drive doesn't show any
errors in the "Grown defect list"; which makes me wonder if it relocated
anything at all? Maybe it just rewrote the sector and in doing that, it
wiped out the error that was (perhaps) due to some weak magnetisation
in that spot.
Also, I'd like to thank everyone for the prompt flood of information
and tips I received for possible actions to take. Very helpful, very timely.
Relevant scsiinfo results:
Inquiry command
---------------
Synchronous neg. 1
Linked Commands 1
Command Queueing 1
Vendor: IBM
Product: DPES-31080
Revision level: S31Q2C738344
Data from Caching Page
----------------------
Write Cache 1
Read Cache 1
Data from Format Device Page
----------------------------
Tracks per Zone 484
Alternate sectors per zone 50
Alternate tracks per zone 1
Alternate tracks per lun 8
Data from Error Recovery Page
-----------------------------
AWRE 1
ARRE 1
TB 0
RC 0
EER 0
PER 0
DTE 0
DCR 0
Read Retry Count 1
Correction Span 0
Head Offset Count 0
Data Strobe Offset Count 0
Write Retry Count 1
Recovery Time Limit 0
Data from Control Page
----------------------
RLEC 0
QErr 0
DQue 0
EECA 0
RAENP 0
UUAENP 0
EAENP 0
Queue Algorithm Modifier 0
Ready AEN Holdoff Period 0
Data from Disconnect-Reconnect Page
-----------------------------------
Buffer full ratio 0
Buffer empty ratio 0
Bus Inactivity Limit 0
Disconnect Time Limit 0
Connect Time Limit 0
Maximum Burst Size 0
DTDC 0x0
Data from Defect Lists
----------------------
120 entries in manufacturer table.
0 entries in grown table.
Data from Verify Error Recovery Page
------------------------------------
EER 0
PER 1
DTE 0
DCR 0
Verify Retry Count 1
Verify Correction Span (bits) 0
Verify Recovery Time Limit (ms) 0
--
Sincerely, srb@cuci.nl
Stephen R. van den Berg (AKA BuGless).
A sign seen in a jewelry store window: "Ears pierced while you wait"
