So, LVM and RAID can create virtual storage devices that can span multiple physical HDDs. After creating logical volumes or a RAID device, the usual thing to do is format the device with a filesystem. Why does mkfs.ext4 work when ext4 is not a clustered filesystem? From what I know each partition on each HDD has a local filesystem of a certain type (ext2,ext3,ext4,ntfs,fat32...). If we combine partitions from multiple different HDDs shouldn't a clustered filesystem be required?What happens if multiple processes try to modify the same file, when a clustered filesystem isn't used?
Why don't LVM and RAID require a clustered filesystem
filesystems;lvm;raid;storage