Problems with aic7880 (AGAIN)

[Mike Bilow]

Doug Ledford wrote in a message to Mike Bilow:

 DL> I would run the EZ-SCSI BIOS routine at startup (the CTRL-A
 DL> message) and then select the SCSI Disk Utilities, then
 DL> select Verify Media on the second hard disk.  If it doesn't
 DL> pass this, then the disk needs a low level format to clear
 DL> out bad sectors and that would be the most likely cause of
 DL> your problems.

Actually, just running "Verify Media" will remap bad sectors if found.

I would also remind readers of the list that many drive manufacturers do not
enable automatic remapping of sectors on write failure (AWRE).  You can check
this with the "scsiinfo" utility.  With AWRE enabled, you should see something
like this:


x:~# scsiinfo -e /dev/sda

Data from Error Recovery Page
-----------------------------
AWRE                               1
ARRE                               1
TB                                 0
RC                                 0
EER                                0
PER                                0
DTE                                0
DCR                                0
Read Retry Count                   33
Correction Span                    48
Head Offset Count                  0
Data Strobe Offset Count           0
Write Retry Count                  22
Recovery Time Limit                65535


With AWRE enabled, you should monitor the grown defect list to see if new
entries appear.  If they do, your drive may need replacement.  This can also be
checked with the "scsiinfo" utility:


x:~# scsiinfo -d /dev/sda

Data from Defect Lists
----------------------
21 entries in manufacturer table.
Format is: bytes from index [Cyl:Head:Off]
Offset -1 marks whole track as bad.

      89:0:24812      96:4:24540      97:8:34888     149:4:27168    
314:4:50050
      427:1:5346     437:6:27732     457:0:20106     584:0:42776    
673:8:29282
     909:1:46118     977:8:38984     1024:3:1978    1239:8:22312   
1265:1:47658
    1381:8:49090    1446:8:19694    1620:1:20880    1737:3:43882    
2191:2:2500
    2295:8:16786

9 entries in grown table.
Format is: bytes from index [Cyl:Head:Off]
Offset -1 marks whole track as bad.

      44:7:11700      52:5:11100      53:5:11100      54:5:11100     
55:5:11100
     795:7:10500     1838:5:7500     1839:5:7500     1840:5:7500


The "scsiinfo" utility can also be used to modify the settings, but that is
beyond the scope of this message.
 
-- Mike



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