lvconvert --type raid5 failure

[Adam Niescierowicz <adam.niescierowicz@justnet.pl>]

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Hi,

I have LV type raid1 and after adding couple disk to VG I anted to 
change raid1 to raid5 so I did:

 > # lvconvert --type raid5 /dev/first/lxc-owncloud-data-new

it converted LV to RAID5 but didn't add new spare so:

 > # lvconvert --stripes 2 /dev/first/lxc-owncloud-data-new

After this LV have 3 device but I didn't saw any sync action and 
movement on the disk so to resync data I used:

 > # lvchange --resync /dev/first/lxc-owncloud-data-new

It was like conversion from 6 to 12TB so after 40 hours when resync was 
done I do mount and XFS complain about FS.

What I did wrong?
Is there a chance that I can recover data?


 From LVM Archive

> # Orginal LV
> lxc-owncloud-data-new {
>     id = "4D3gRF-19uK-kCTX-DaYS-tmEx-Egs5-zRs7xp"
>     status = ["READ", "WRITE", "VISIBLE"]
>     flags = []
>     creation_time = 1713726446  # 2024-04-21 21:07:26 +0200
>     creation_host = "lxc4"
>     segment_count = 1
>
>     segment1 {
>         start_extent = 0
>         extent_count = 1572864  # 6 Terabytes
>
>         type = "raid1"
>         device_count = 2
>         region_size = 8192
>
>         raids = [
>             "lxc-owncloud-data-new_rmeta_0", 
> "lxc-owncloud-data-new_rimage_0",
>             "lxc-owncloud-data-new_rmeta_1", 
> "lxc-owncloud-data-new_rimage_1"
>         ]
>     }
> }
>
>
> # After lvconvert --type raid5 /dev/first/lxc-owncloud-data-new
> lxc-owncloud-data-new {
>     id = "4D3gRF-19uK-kCTX-DaYS-tmEx-Egs5-zRs7xp"
>     status = ["READ", "WRITE", "VISIBLE"]
>     flags = []
>     creation_time = 1713726446  # 2024-04-21 21:07:26 +0200
>     creation_host = "lxc4"
>     segment_count = 1
>
>     segment1 {
>         start_extent = 0
>         extent_count = 1572864  # 6 Terabytes
>
>         type = "raid5"
>         device_count = 2
>         region_size = 8192
>         stripe_size = 128
>
>         raids = [
>             "lxc-owncloud-data-new_rmeta_0", 
> "lxc-owncloud-data-new_rimage_0",
>             "lxc-owncloud-data-new_rmeta_1", 
> "lxc-owncloud-data-new_rimage_1"
>         ]
>     }
> }
>
>
> # After lvconvert --stripes 2 /dev/first/lxc-owncloud-data-new
> lxc-owncloud-data-new {
>     id = "4D3gRF-19uK-kCTX-DaYS-tmEx-Egs5-zRs7xp"
>     status = ["READ", "WRITE", "VISIBLE"]
>     flags = []
>     creation_time = 1713726446  # 2024-04-21 21:07:26 +0200
>     creation_host = "lxc4"
>     segment_count = 1
>
>     segment1 {
>         start_extent = 0
>         extent_count = 3145730  # 12 Terabytes
>
>         reshape_count = 1   # 4 Megabytes
>         type = "raid5"
>         device_count = 3
>         region_size = 16384
>         stripe_size = 128
>
>         raids = [
>             "lxc-owncloud-data-new_rmeta_0", 
> "lxc-owncloud-data-new_rimage_0",
>             "lxc-owncloud-data-new_rmeta_1", 
> "lxc-owncloud-data-new_rimage_1",
>             "lxc-owncloud-data-new_rmeta_2", 
> "lxc-owncloud-data-new_rimage_2"
>         ]
>     }
> }
>
> # Didn't have progress of reshape in LVS
>
> lxc-owncloud-data-new {
>     id = "4D3gRF-19uK-kCTX-DaYS-tmEx-Egs5-zRs7xp"
>     status = ["READ", "WRITE", "VISIBLE"]
>     flags = []
>     creation_time = 1713726446  # 2024-04-21 21:07:26 +0200
>     creation_host = "lxc4"
>     segment_count = 1
>
>     segment1 {
>         start_extent = 0
>         extent_count = 3145728  # 12 Terabytes
>
>         type = "raid5"
>         device_count = 3
>         region_size = 16384
>         stripe_size = 128
>
>         raids = [
>             "lxc-owncloud-data-new_rmeta_0", 
> "lxc-owncloud-data-new_rimage_0",
>             "lxc-owncloud-data-new_rmeta_1", 
> "lxc-owncloud-data-new_rimage_1",
>             "lxc-owncloud-data-new_rmeta_2", 
> "lxc-owncloud-data-new_rimage_2"
>         ]
>     }
> }
>
> # lvchange --resync /dev/first/lxc-owncloud-data-new


-- 
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Pozdrawiam
Adam Nieścierowicz

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