Re: [gentoo-user] New drive devices after install

[Mark Knecht <markknecht@gmail.com>]

On Sat, Feb 19, 2011 at 2:01 AM, Neil Bothwick <neil@digimed.co.uk> wrote:
> On Fri, 18 Feb 2011 17:54:56 -0700, Mike Diehl wrote:
>
>> I just finished a new (RAID1) installation and most if it is working
>> just fine.
>>
>> However, I don't have any drive device files in /dev/.  I'd expect to
>> see hda, hdb,md{1-3}
>
> Something changed recently, my RAID devices are now md126 and md127.
>
>
> --
> Neil Bothwick
>
> If at first you don't succeed, redefine success.
>

I see the same thing here. I'm in the middle of an install so I create
/dev/md3 to build my RAID1. I build it, install, chroot, do the work,
install grub, reboot and it's md126. The problem is that the machine
name changes between the install and the reboot.

The change apparently has something to do with a decision to only
assemble Version 1.+ superblocks with the right name when the name
field matches something in the superblock.

Apparently you can set up the naming as you wish using

mdadm --update=homehost
mdadm --update=name

but I don't feel confident enough yet to do it.

c2stable ~ # mdadm --detail /dev/md126
/dev/md126:
        Version : 0.90
  Creation Time : Tue Apr 13 09:02:34 2010
     Raid Level : raid1
     Array Size : 52436032 (50.01 GiB 53.69 GB)
  Used Dev Size : 52436032 (50.01 GiB 53.69 GB)
   Raid Devices : 3
  Total Devices : 3
Preferred Minor : 126
    Persistence : Superblock is persistent

    Update Time : Sat Feb 19 06:13:16 2011
          State : clean
 Active Devices : 3
Working Devices : 3
 Failed Devices : 0
  Spare Devices : 0

           UUID : edb0ed65:6e87b20e:dc0d88ba:780ef6a3
         Events : 0.248829

    Number   Major   Minor   RaidDevice State
       0       8        5        0      active sync   /dev/sda5
       1       8       21        1      active sync   /dev/sdb5
       2       8       37        2      active sync   /dev/sdc5
c2stable ~ #

- Mark