CAS setup dual-machine hot standby service detection reported an error: configuration failure (CONF), please try to log in again and configure

During CAS E0785P01 dual-machine setup, Step 3 hot standby service detection failed. Disk synchronization prompt: configuration failure (CONF). Please try logging in again and reconfiguring.

Check the cvm_master_slave.log under the /var/log directory on the CVM. This log is related to hot standby. Use /error to filter error logs.

It found out  that /dev/sda6 on CVM1 cannot be umounted.

Attempt to manually umount on CVM1 by entering the following command: umount /dev/sda6. 

Use lsof /dev/sda6 to check if any files are open and occupying the directory. No output means none.

Use the command df -h to view the file system.

/dev/sda6 is the /vms directory with a drive /dev/sdb mounted under it. Upon inquiry this is the local storage drive for the business mounted under /vms/yp1 which prevents /vms from being umounted.

Ask the customer if the disk can be temporarily unmounted. After obtaining permission, unmount the /dev/sdb disk, clear the browser cache, and then re-establish the dual-system hot standby to complete the process normally.