i have an openstack cluster and i have configured multiattach in the openstack cinder now when i create 1 volume (with volume type multiattach) and attach it to 2 instances test1 and test2

on test1 sudo mkfs -t ext4 /dev/sdb sudo mkdir /mnt/mydisk sudo mount /dev/sdb /mnt/mydisk touch /mnt/mydisk/shared_file echo "This is some shared content" | sudo tee /mnt/mydisk/shared_file

on test2 sudo mkdir /mnt/mydisk

sudo mount /dev/sdb /mnt/mydisk

ls /mnt/mydisk/

cat /mnt/mydisk/shared_file

i can see the shared_file now when i add new files on test1 im not able to see it on test2 untill i unmount the volume with directory and mount the directory again to the volume on test2.