aic7xxx: scsi cdwriter halts the system

[Axel Roebel]

Hello,

I am running an Adaptec 2940U2W Card in our Linux Server system. 
Attached to the card are two U2W LVD HDisks (including the root disk) and
a CDROM.

The problem is that I would like to attach an additional cdwriter
to the interface. However, if I do so and use cdrecord to burn the images
the system only survives one cycle of writing and finishing a disk.
The second time I start writing cdrecord hangs and soon after this,
because the attached disks include the root disk, the whole system hangs
and I have to reset. This is rather annoying.
I am using kernel 2.2.13 and have applied all aic7xxx patches (up to 28).

The proc device lists the following configuration (cdwriter is MATSHITA
CD-R   CW-7502, Rev4.10  scsi-id=6 not connected here).

scsi0 : Adaptec AHA274x/284x/294x (EISA/VLB/PCI-Fast SCSI) 5.1.28/3.2.4
       <Adaptec AHA-294X Ultra2 SCSI host adapter>
scsi : 1 host.
(scsi0:0:0:0) Synchronous at 40.0 Mbyte/sec, offset 31.
  Vendor: IBM       Model: DNES-309170W      Rev: SA30
  Type:   Direct-Access                      ANSI SCSI revision: 03
Detected scsi disk sda at scsi0, channel 0, id 0, lun 0
(scsi0:0:1:0) Synchronous at 40.0 Mbyte/sec, offset 31.
  Vendor: IBM       Model: DNES-309170W      Rev: SA30
  Type:   Direct-Access                      ANSI SCSI revision: 03
Detected scsi disk sdb at scsi0, channel 0, id 1, lun 0
(scsi0:0:3:0) Synchronous at 20.0 Mbyte/sec, offset 15.
  Vendor: PLEXTOR   Model: CD-ROM PX-40TS    Rev: 1.01
  Type:   CD-ROM                             ANSI SCSI revision: 02
Detected scsi CD-ROM sr0 at scsi0, channel 0, id 3, lun 0
Uniform CDROM driver Revision: 2.56
SCSI device sda: hdwr sector= 512 bytes. Sectors= 17916240 [8748 MB] [8.7 GB]   

Have anybody heard of similar problems or do  have any idea what to
do to further  investigate the problem? It seems to be very difficult 
because the system does not stay alive after the problem occures.

With best regards, Axel.

-- 
-----------------------------------------------------------
Technical University Berlin, Depart. Communication Research
Sekr. EN 8,   Einsteinufer 17,   10587   Berlin,    Germany
___________________________________________________________
Dr. Axel Roebel          | e-mail: roebel at kgw.tu-berlin.de
phone: +49 30 314 25699  | fax:    +49 30 314 21143 


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