RAID 5 failure. All drives missing

root@omv2:~# fsck /dev/md127
fsck from util-linux 2.29.2
e2fsck 1.44.5 (15-Dec-2018)
One or more block group descriptor checksums are invalid. Fix<y>? yes
Group descriptor 16336 checksum is 0x6bcd, should be 0x3204. FIXED.
Group descriptor 16341 checksum is 0x79be, should be 0x4ace. FIXED.
Group descriptor 16351 checksum is 0x5371, should be 0xf404. FIXED.
Pass 1: Checking inodes, blocks, and sizes

Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Unattached inode 95224299
Connect to /lost+found<y>? yes
Inode 95224299 ref count is 2, should be 1. Fix<y>? yes
Pass 5: Checking group summary information
Free blocks count wrong for group #16336 (263676314, counted=24986).
Fix<y>? yes
Free blocks count wrong for group #23120 (105, counted=106).
Fix<y>? yes
Free blocks count wrong for group #23267 (295, counted=0).
Fix<y>? yes
Free blocks count wrong for group #23273 (14, counted=18).
Fix<y>? yes
Free inodes count wrong for group #16336 (921600, counted=4096).
Fix<y>? yes
Directories count wrong for group #16336 (2091450368, counted=0).
Fix<y>? yes
Free inodes count wrong for group #23248 (1005, counted=1004).
Fix<y>? yes
Inode bitmap differences: Group 16336 inode bitmap does not match checksum.
FIXED.
Block bitmap differences: Group 10720 block bitmap does not match checksum.
FIXED.

RAID5: ***** FILE SYSTEM WAS MODIFIED *****
RAID5: 563262/183132160 files (16.0% non-contiguous), 847085452/1465037568 blocks
root@omv2:~#

Great, now seems to be working!
Thank you very much!

I'm trying to copy out data with rsync, there are some errors from the shell (ata7 errors...) but so far seems to be copying

Thank you very much again, though.
i’m fine now, the copy is slow but proceeding.
I will backup the data and and check the components. Those disks are 10 years old... the may want to rest ... in the bin
Best, Max