Re: Statically nameing a SCSI device

["Gerald V. Livingston II" <gerald.hotplug@sysmatrix.net>]

On Sun, August 12, 2007 7:24, Kay Sievers said:

> On 8/12/07, gerald.hotplug@sysmatrix.net <gerald.hotplug@sysmatrix.net>
> wrote:
>>
>> Now, that being said, it will be a lot easier for *ME* if I always know
>> exactly where the SATA drives are located in the plain-old /dev tree and
>> if I can call them /dev/sdw or /dev/sdz rather than
>> /dev/disk/by-id/ata-WDC_WD2500YS-01S-WD-WCANY1955037
>>
>> I added this to my local.rules and udevtest says it works great for the
>> first drive I already have installed:
>>
>> KERNEL="sd*[!0-9]", IMPORT="/sbin/scsi_id -g -x $tempnode"
>> KERNEL="sd*[!0-9]",
>> ENV{ID_SERIAL}="SATA_WDC_WD2500YS-01_WD-WCANY1955037", NAME="sdw"
>>
>> As I add the other 3 drives I just need to add lines to identify their
>> serial numbers and set them at sdx, sdy, and sdz.
>
> If you change the default name of the nodes, you will never find the
> disk a possible error log from the kernel belongs to. You should only
> use symlinks.
>
> /dev/disk/* has probably all you need already without any custom rule.
>
> Kay

So, better would be:

KERNEL="sd*[!0-9]", IMPORT="/sbin/scsi_id -g -x $tempnode"
KERNEL="sd*[!0-9]",
ENV{ID_SERIAL}="SATA_WDC_WD2500YS-01_WD-WCANY1955037", SYMLINK+="sdw"

The disks will all be the same model so the info in /dev/disk will be the
same except for a number or two. Too easy to mix them up if I'm looking
for something specific while moving hardware around.

Gerald


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