metadata. If the replication group membership is saved for each chunk, the number of metadata will be large. 2. Example Reduce the number of replication groups. The size of chunk is usually small, such default. If replication groups are created based on chunk. The number of replication groups is large and the communication traffic between replication groups is heavy. Once a CopySet is introduced

Asynchronous direct I/O requests are generated if * FUSE_CAP_ASYNC_DIO is enabled and userspace submits a large * direct I/O request. In this case the kernel will internally * split it up into multiple smaller has_journal ext_attr resize_inode dir_index filetype needs_recovery extent 64bit flex_bg sparse_super large_file huge_file dir_nlink extra_isize metadata_csum Filesystem flags: signed_directory_hash

WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ syntax="proto2"; package curvefs WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ syntax="proto2"; package curvefs WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ syntax="proto2"; package curvefs

Requirements ○ Cloud Native ○ Easy operation and maintenance ○ High performance ● CEPH ○ Complex and Large amount of codes ○ system maintenance are difficult in corner cases ○ Performance requirements cannot

基于FUSE提供POSIX兼容⽂件接⼝ • 问题 • 相对kernel⽂件系统的实现(ext4, xfs)性能 差异⼤，延迟⾼FUSE⽂件IO读写流程 • 场景1 pytorch example word_language_model • LOOKUP inode 返回 fstat + timeout设置 • OPEN 打开 inode返回ok • GETATTR 返回fstat • READ inode