we have installed the daemon in two different server(both ubuntu 16.04), all are having the same issue
And I/O error, what might that be ?
Based on my experience, there are 3 common reason :
1. Corrupt storage drive (HDD, SSD, SD card, etc.)
2. No permission to write/read on storage device. I doubt it's the reason in this case
3. Incorrect mount configuration. Also unlikely in this case and usually it happens if you use NTFS partition
Why don't you use
fsck to check status of your storage/partition and fix any problem automatically?
sudo fsck -y /dev/sda1