Re: How to get consistent names for USB ports...

[Don Armstrong <don@debian.org>]

On Sat, 27 Feb 2016, Andrew McGlashan wrote:
> Yes, but can you define RAID devices by UUID or Label?

mdadm RAID devices have their own UUID as well as the UUID of the array that
they are part of.

> Those drives are not showing via UUID or label here...

% sudo mdadm --examine /dev/sda1       
/dev/sda1:
          Magic : a92b4efc
        Version : 1.2
    Feature Map : 0x0
     Array UUID : 3e7a6596:51993940:33a49f10:681fdf84
           Name : gorgon:0
  Creation Time : Fri Aug 12 15:38:29 2011
     Raid Level : raid1
   Raid Devices : 3

 Avail Dev Size : 974824 (476.07 MiB 499.11 MB)
     Array Size : 487412 (476.07 MiB 499.11 MB)
    Data Offset : 24 sectors
   Super Offset : 8 sectors
          State : clean
    Device UUID : df717760:f75510d7:a397cbe0:8f516735

    Update Time : Sun Feb  7 00:57:11 2016
       Checksum : 9f11296b - correct
         Events : 353


   Device Role : Active device 0
   Array State : AAA ('A' == active, '.' == missing, 'R' == replacing)


For example.

mdadm is fully capable of scanning available devices to find the ones
with the right Array UUID and Device UUIDs.

-- 
Don Armstrong                      http://www.donarmstrong.com

Junkies were all knitted together in a loose global macrame, the
intercontinental freemasonry of narcotics.
 -- Bruce Sterling, _Holy Fire_ p257