Re: RAID5 now recognized as RAID1

Hi Nicolas Martin,

I just got my new disk and plugged it into the NAS waiting it finish
RAID 5 rebuild.
Here is what I found:
* The OS itself will create 4 RAID1 to used for the OS , and the RAID5
of your data  it should be  /dev/md1

Here is the diagram in text version:  (You may need to copy them into
a txt to make it looks normal.)


  +---------+        +---------+        +---------+
  |         |        |         |        |         |  /dev/md9  RAID1
 /mnt/HDA_ROOT
  |   1     |        |   1     |        |   1     |      sda1
  |    543MB|        |    543MB|        |    543MB|      sdb1
  -----------        -----------        -----------      sdc1
  |         |        |         |        |         |
  |   2     |        |   2     |        |   2     |  /dev/md256 RAID1
  |    543MB|        |    543MB|        |    543MB|      sda2
  -----------        -----------        -----------      sdb2
  |         |        |         |        |         |      sdc2
  |         |        |         |        |         |
  |         |        |         |        |         |
  |         |        |         |        |         |
  |         |        |         |        |         |
  |         |        |         |        |         |  /dev/md1 RAID5
LV: lv1    1.78T
  |         |        |         |        |         |       sda3
 lv544  18.54G
  |         |        |         |        |         |       sdb3
  |         |        |         |        |         |       sdc3       VG: vg288
  |         |        |         |        |         |
PV: /dev/md1
  |         |        |         |        |         |
  |   3     |        |   3     |        |   3     |
  |    990GB|        |    990GB|        |    990GB|
  |         |        |         |        |         |
  |         |        |         |        |         |
  |         |        |         |        |         |
  |         |        |         |        |         |
  |         |        |         |        |         |
  |         |        |         |        |         |
  |         |        |         |        |         |
  |         |        |         |        |         |
  |         |        |         |        |         |
  |         |        |         |        |         |
  -----------        -----------        -----------
  |         |        |         |        |         |  /dev/md13 RAID1
  /mnt/ext
  |   4     |        |   4     |        |   4     |       sda4
  |    543MB|        |    543MB|        |    543MB|       sdb4
  -----------        -----------        -----------       sdc4
  |         |        |         |        |         |
  |   5     |        |   5     |        |   5     |
  |  8544MB |        |  8544MB |        |  8544MB |  /dev/md322 RAID1
  |         |        |         |        |         |       sda5
  +---------+        +---------+        +---------+       sdb5
     sda                sdb                sdc            sdc6


Table Summary:
/dev/md9     RAID1    (sda1 sdb1 sdc1 ;543MB each)  /mnt/HDA_ROOT
/dev/md256 RAID1    (sda2 sdb2 sdc2 ;543MB each)
/dev/md1     RAID5    (sda3 sdb3 sdc3 ;990GB each)  PV:/dev/md1
VG:vg288   LV:lv1
/dev/md13   RAID1   (sda4 sdb4 sdc4 ;543MB each)  /mnt/ext
/dev/md322 RAID1   (sda5 sdb5 sdc5 ;8544MB each)

As you could see ,  my data is under  /dev/md1 RAID5 , for others they
are the RAID1.

Hope these could help you a little.


On Mon, Jul 12, 2021 at 4:29 PM Wols Lists [off-list ref] wrote:

On 08/07/21 11:07, Nicolas Martin wrote:

quoted

So, I don’t know how this could happen ? I looked up on the FAQ, but I can’t seem to see what could explain this, nor how I can recover from this ?

https://raid.wiki.kernel.org/index.php/Asking_for_help

Cheers,
Wol

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