On Sun, March 29, 2009 9:21 am, Patrick Ringl wrote:

Hello Neil,

NeilBrown wrote:

quoted

Linux RAID10 with

     Raid Level : raid10
   Raid Devices : 4
         Layout : near=2, far=1

Will layout data like this:

   disk0   disk1   disk2   disk3
     A       A       B       B
     C       C       D       D
     E       E       F       F

You have removed disk0 and disk1, so A,C,E don't exist
any more.  You should get IO errors when you try to access
that data.

Sorry, but I removed loop0 and loop2 so that would be disk0 and disk2 -
so ACE as well as BDF should still exist and recover. Could you explain
this, I am I just getting you wrong?

From the Pastezone thing...
-----------------------------------------------------
    Number   Major   Minor   RaidDevice State
       0       7        2        0      active sync   /dev/loop2
       1       7        0        1      active sync   /dev/loop0
       2       7        1        2      active sync   /dev/loop1
       3       7        3        3      active sync   /dev/loop3
pari:/mnt/debian# mdadm --manage /dev/md0 -f /dev/loop2
mdadm: set /dev/loop2 faulty in /dev/md0
pari:/mnt/debian# mdadm --manage /dev/md0 -f /dev/loop0
mdadm: set /dev/loop0 faulty in /dev/md0
---------------------------------------------------

So while you did remove loop0 and loop2, these were disk1 and disk0.

NeilBrown