two-level mapping and introduced segment. 2. Segment is also the granularity of space allocation. Multiple chunks are aggregated into one segment. The default segment size can be 1GB. it only requires (ChunkServer). A CopySet is the basic unit of data replication in CurveBS. A CopySet contains multiple chunks. Copysets in CurveBS are created in advance. When users write data, they only need to select

applications can access file data in storage pools through interfaces such as NFS/HDFS/Posix api Manage multiple types of storage (object storage, HDFS storage, Elastic block storage) Support both on-premise

Page 4 of 30 1. // Campaign puts a value as eligible for the election on the prefix // key. // Multiple sessions can participate in the election for the // same prefix, but only one can be the leader

submits a large * direct I/O request. In this case the kernel will internally * split it up into multiple smaller requests and submit them * to the filesystem concurrently. * * Note that the following