Hi Nikolov,
Thanks for the very interesting answer :-)
I do not use any raid controller. I was hoping glusterfs would take care of fault
tolerance but apparently it failed.
I have one Samsung 1TB SSD drives in each server for VM storage. I see it is of type
"multipath". There is XFS filesystem over standard LVM (not thin).
Mount options are: inode64,noatime,nodiratime
SELinux was in permissive mode.
I must read more about the things you described as have never dived into it.
Please let me know if you have any suggestions :-)
Thanks a lot!
Jarek