Re: disk order problem in a raid 10 array

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 [off-list ref] 

wrote:

quoted

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. . .

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 "real" 
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 wld 
like to be sure...


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