mapping names to sdx devices

mapping names to sdx devices

[uzoma nwosu]

Is it possible to map a uuid to an existing device such as sdb or are 
those names reserved?    I don't have any problems when mapping devices 
with unique names.

Regards,
uzoma






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Re: mapping names to sdx devices

[Kay Sievers]

On Tue, 2006-06-13 at 10:34 -0400, uzoma nwosu wrote:
> Is it possible to map a uuid to an existing device such as sdb or are 
> those names reserved?    I don't have any problems when mapping devices 
> with unique names.

Care to explain your question or problem, I don't really understand what
you are looking for.

Kay



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Re: mapping names to sdx devices

[uzoma nwosu]

Kay Sievers wrote:

>On Tue, 2006-06-13 at 10:34 -0400, uzoma nwosu wrote:
>  
>
>>Is it possible to map a uuid to an existing device such as sdb or are 
>>those names reserved?    I don't have any problems when mapping devices 
>>with unique names.
>>    
>>
>
>Care to explain your question or problem, I don't really understand what
>you are looking for.
>
>Kay
>
>  
>
Sure.  What happens is I can not get udev to map an iscsi target to 
'/dev/sdb'.  However, when I write a rule for it to name the device 
'/dev/drive1', it works. Are  the names for scsi devices reserved so 
that I can't use them? 

thanks,

uzoma


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Re: mapping names to sdx devices

[Kay Sievers]

On Wed, 2006-06-14 at 15:10 -0400, uzoma nwosu wrote:
> Sure.  What happens is I can not get udev to map an iscsi target to 
> '/dev/sdb'.  However, when I write a rule for it to name the device 
> '/dev/drive1', it works. Are  the names for scsi devices reserved so 
> that I can't use them? 

Did you look at the persistent device naming which comes with udev?
Almost everybody ships it these days:
  http://www.kernel.org/git/?p=linux/hotplug/udev.git;a=blob;f=etc/udev/60-persistent-storage.rules

It looks like this for a single device:
  $ tree /dev/disk
  /dev/disk
  |-- by-id
  |   `-- scsi-SATA_HTS726060M9AT00_MRH453M4HWHG7B-part6 -> ../../sda6
  |-- by-label
  |   `-- devel -> ../../sda6
  |-- by-path
  |   `-- pci-0000:00:1f.2-scsi-0:0:0:0-part6 -> ../../sda6
  `-- by-uuid
      `-- 3e999973-00c9-4917-9442-b7633bd95b9e -> ../../sda6

You should be able to identify the devices persistently by using the
symlinks here instead of the kernel name, without the need for any custom
rule.

Kay



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