The Object Storage Service stores objects in filesystems. Currently, XFS and ext4 are supported. The ext4 filesystem is recommended.

Your filesystem must be mounted with xattr enabled. For example, this is from /etc/fstab:

/dev/sdb1	/srv/node/d1	ext4	acl,user_xattr	0 0

The Object Storage service expects devices to be mounted at /srv/node/.