LUKS2 - RAID0 - NVME : alignment issue

[laurent cop <laurent.cop@xxxxxxxxx>]

Hello,

I have trouble while in top of the stack :
mkfs.ext4 /dev/mapper/raid0luks2

/dev/mapper/raid0luks2 alignement is offset by 147456 bytes

This may result in very poor performance (re-) partitioning is suggested.

I have the same pb with mkfs.xfs

I am using following scheme:

LUKS2           => created with cryptsetup -v luksFormat --type luks2 /dev/md127 --cipher aes-gcm-random --integrity aeae

RAID 0           => created with mdadm chunk=32

3 Disks NVME => partition with gdisk (fist sector : 2048)

I got this information with lsblk -t for each 3 disks, i got the same information.

nvmeXn1

       -> NvmeXn1p1                                 ALIGN = 0

                  -> md127                               ALIGN = 0

                           -> raid0luks2_dif           ALIGN = 147456

                                       -> raid0luks2     ALIGN = 147456

1) How can I solve my alignment issue?

2) Is it normal to have low performances while writing with dd. I was using LUKS previously and I got only one dev mapper. Now I got 2. Does it have a big impact on performances?

Kind regards.

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