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mapping names to sdx devices

DISCUSSION uzoma nwosu 2 participants 4 messages Jun 13, 2006 – Jun 15, 2006

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#1 lore raw
Quoted 3 lines · 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.

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

Kay

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#2 lore raw
In reply to uzoma nwosu
Quoted 9 lines · Kay Sievers
Quoted 5 lines · 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.

Quoted 7 lines

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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#3 lore raw
In reply to uzoma nwosu
Quoted 4 lines · uzoma nwosu

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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