Re: /dev/disk/by-id incomplete and unhelpful for SATA drives

[Chris Paulson-Ellis <chris@edesix.com>]

Kay Sievers wrote:
> On Wed, Dec 21, 2005 at 06:05:17PM +0000, Chris Paulson-Ellis wrote:
> 
>>[snip]
>>http://bugs.gentoo.org/show_bug.cgi?id\x109582
>>
>>I'm currently running udev-078 on vanilla 2.6.15-rc6
>>[snip]
> 
> Maxtor has a long history of doing broken serial numbers, they even
> shipped disks with serials like: "M0000000000000000000". Regarding
> this, the first suspect here is the disk itself.

I'm not suprised. I've also found Maxtor to be a manafacturer of poor 
quality drives. I hope Seagate know what they're buying! This doesn't 
explain why one of the drives is missing altogether from by-id, while 
the other drive of the same model is present, albeit with a duff name.

> Are the examples with the sata/pata in the bug:
>   /dev/disk
>   |-- by-id
>   |   |-- ata-Maxtor_4D080H4_D41S8XWE -> ../../hde
> 
> 
>   /dev/disk
>   |-- by-id
>   |   |-- scsi-0ATA_Maxtor_6Y160M0_Linux_ATA-SCSI_simulator -> ../../sdb
> 
> from the same disk model in a different box, or is it a different disk
> model?

Different models (PATA/SATA). The drive models shown in the first part 
of the by-id name are correct.

> What does:
>   scsi_id -g -p0x80 -x -s /block/sda
>   scsi_id -g -p0x83 -x -s /block/sda
> print?

It looks like you're on to something (though I don't understand what); 
The first command reveals the correct serial number...

# scsi_id -g -p0x80 -x -s /block/sda
ID_VENDOR=ATA
ID_MODEL=Maxtor_6Y160M0
ID_REVISION=YAR5
ID_SERIAL=SATA_Maxtor_6Y160M0_Y4DCTR3E
ID_TYPE=disk
ID_BUS=scsi
# scsi_id -g -p0x83 -x -s /block/sda
ID_VENDOR=ATA
ID_MODEL=Maxtor_6Y160M0
ID_REVISION=YAR5
ID_SERIAL
TA_Maxtor_6Y160M0_Linux_ATA-SCSI_simulator
ID_TYPE=disk
ID_BUS=scsi


> Any chance to check the failing disk on an interface in pata mode, so
> you get a hd* entry instead?

I thought the SATA as PATA driver had been replaced by libata? It may be 
hard to change them anyway as they are in a pre-existing RAID array 
which may not appreciate the change of naming! I'll give it a go if the 
above is not sufficient.

Chris.



-------------------------------------------------------
This SF.net email is sponsored by: Splunk Inc. Do you grep through log files
for problems?  Stop!  Download the new AJAX search engine that makes
searching your log files as easy as surfing the  web.  DOWNLOAD SPLUNK!
http://ads.osdn.com/?ad_idv37&alloc_id\x16865&op=click
_______________________________________________
Linux-hotplug-devel mailing list  http://linux-hotplug.sourceforge.net
Linux-hotplug-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/linux-hotplug-devel