Re: disk order problem in a raid 10 array

[Xavier Brochard <xavier@alternatif.org>]

Le vendredi 18 mars 2011 18:22:34 hansbkk@gmail.com, vous avez écrit :
> On Fri, Mar 18, 2011 at 9:49 PM, Xavier Brochard <xavier@alternatif.org> 
wrote:
> > disk order is mixed between each boot - even with live-cd.
> > is that normal?
> 
> If nothing is changing and the order is swapping really every boot,
> then IMO that is odd.

nothing has changed, except kernel minor version

> 
> Part of my SOP is now to record both mdadm and the boot loader's
> ordering against serial number and UUID of drives when creating an
> array, and to put the relevant information on labels securely attached
> to the physical drives, along with creating a map of their physical
> location and taping that inside the case.nt
> 
> It's critical to know what's what in a crisis. . .

exactly, in my case mdadm --examine output is somewhat weird as it shows:
/dev/sde1
this     0       8       33        0      active sync   /dev/sdd1
/dev/sdd1
this     0       8       33        0      active sync   /dev/sdc1
/dev/sdc1
this     0       8       33        0      active sync   /dev/sde1
and /dev/sdf1 as sdf1

I think I can believe mdadm?
and that /proc/mdstat content comes directly from mdadm (that is with "exact"
sdc,d,e)?

what trouble me is that after I removed 2 disk drive from the bay, mdadm start 
to recover: 
md0 : active raid10 sdb1[1] sdc1[4] sdd1[3]
      976767872 blocks 64K chunks 2 near-copies [4/2] [_U_U]
      [=>...................]  recovery =  5.0% (24436736/488383936) 
finish=56.2min speed=137513K/sec

I guess that it is ok, and that it is recovering with the spare. But I would 
like to be sure...


Xavier
xavier@alternatif.org - 09 54 06 16 26
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