Hello, Shubham. Neither ext4 nor xfs are filesystems that can be used for access resources at the same time. You should use, ie,  OCFS2 as filesystem. It can handle concurrent access to the filesystem. Javier.- El 18/1/24 a las 10:25, Shubham Kumar Yadav escribió:

Hi, i have a question/issue related to multiattach feature in cinder

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 notable to see it on test2 untilli unmount the volume with directory and mount the directory again to the volume on test2.

what could be the solution for it? how can i make the volume share datas instantly between all the instances connected to the volume

i have tried with ext4 and xfs file system

Hope to hear from you soon Thank you!