Hi Olivier,
I saw the similar issue, when a disk was mounted incorrectly or a disk had incorrect
size.
Can you please provide here what df and du give you on each host. Please perform on each
host:
df -h /gluster_bricks/data/data
du -hs /gluster_bricks/data/data
df /gluster_bricks/data_extend1/data
du /gluster_bricks/data_extend1/data
Thanks,
Maxim