[no subject]

Thanks,
Dow



Dow Hurst wrote:
> I have been working on a storage solution for our molecular dynamics 
> lipid simulations done at the Pittsburgh Supercomputer Center.  One of 
> our researchers uses the Pitt. computers and then downloads a tar file 
> of her data to store here at KSU.  The simulations run into 4Gb of data 
> per simulation of up to 2 picoseconds or more of simulation time.  My 
> solution is to have her burn a couple of DVDs, with a iso9660 format, of 
> the data.  One DVD would stay at KSU and the other would go home with her.
> 
> My problem has cropped up with the DVD ATAPI drives having errors such 
> as below when trying to access files on the DVD that has been burned and 
> verified okay by K3B on SUSE 9.0.  The DVDs have been burned on two 
> different DVD burners and are two different DVD disc compositions, one 
> is 2x and the other is the newer 4x capable surface.  Both discs have 
> exhibited this problem when accessing files thru an ATAPI based DVD 
> reader drive:
> 
> Dec 24 11:58:02 knife kernel: hdc: irq timeout: error=0x00
> Dec 24 11:58:02 knife kernel: hdc: ATAPI reset complete
> Dec 24 11:58:02 knife kernel: end_request: I/O error, dev 16:00 (hdc), 
> sector 7235292
> Dec 24 11:58:12 knife kernel: hdc: irq timeout: status=0xd0 { Busy }
> Dec 24 11:58:12 knife kernel: hdc: irq timeout: error=0x00
> Dec 24 11:58:12 knife kernel: hdc: ATAPI reset complete
> Dec 24 11:58:22 knife kernel: hdc: irq timeout: status=0xd0 { Busy }
> Dec 24 11:58:22 knife kernel: hdc: irq timeout: error=0x00
> Dec 24 11:58:22 knife kernel: hdc: ATAPI reset complete
> Dec 24 11:58:22 knife kernel: end_request: I/O error, dev 16:00 (hdc), 
> sector 7235296
> 
> Now, if I emulate SCSI on the ATAPI drive or if I don't I still get the 
> same errors.  I've found this under the Emperor Linux kernel on a Dell 
> I8500 laptop running SuSE 8.2, and on a Dell i360n workstation running 
> standard RH9 with hyperthreading and the 2.4.20-24.9smp kernel.  Now, on 
> that same i360n workstation if I use the Firewire based LaCie DVD-RAM 
> burner drive I don't get any errors at all.
> 
> So, I think it must be a ATAPI kernel interface problem since the 
> firewire uses SCSI-emulation.  What is recommended?  Anyone run into 
> this or hear of this kind of problem?  Thanks,
> Dow
> 
> PS.  The ATAPI DVD drives are readers only.  One is on the Dell 
> workstation and one is on the Dell laptop.  I could post specifics on 
> the drives if needed, but I am wondering if this isn't hardware related 
> but the ATAPI IDE module.
> 
> -- 
> __________________________________________________________
> Dow Hurst                  Office: 770-499-3428            *
> Systems Support Specialist    Fax: 770-423-6744            *
> 1000 Chastain Rd. Bldg. 12                                 *
> Chemistry Department SC428  Email:   dhurst at kennesaw.edu   *
> Kennesaw State University         Dow.Hurst at mindspring.com *
> Kennesaw, GA 30144                                         *
> ************************************************************
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> 
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-- 
__________________________________________________________
Dow Hurst                  Office: 770-499-3428            *
Systems Support Specialist    Fax: 770-423-6744            *
1000 Chastain Rd. Bldg. 12                                 *
Chemistry Department SC428  Email:   dhurst at kennesaw.edu   *
Kennesaw State University         Dow.Hurst at mindspring.com *
Kennesaw, GA 30144                                         *
************************************************************
This message (including any attachments) contains          *
confidential information intended for a specific individual*
and purpose, and is protected by law.  If you are not the  *
intended recipient, you should delete this message and are *
hereby notified that any disclosure, copying, distribution *
of this message, or the taking of any action based on it,  *
is strictly prohibited.                                    *
************************************************************


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