Ceph分布式系统的ISCSI高可用集群

摘要

Commonly, the distributed storage cluster support ISCSI protocol for compatibility and scalability. But, the high availability of ISCSI services is mainly achieved through a master slave remote system which wastes resources and easily makes the server overload. This paper uses raft consistency algorithms to implement a high availability cluster of ISCSI service based on the advantages of Ceph. In order to implement the high availability, the cluster supports load balancing using sensible selection policy and services migration after detecting the failover of the server. The experiments show that the proposed scheme is effective, and can achieve services migration, and ensure the load balancing.%在分布式存储集群环境中,为了兼容现有存储协议,提高集群可扩展性,通常都会支持ISCSI存储协议.而现有ISCSI服务的高可用主要通过主从备份的方式实现,该方式会导致资源利用不充分,容易造成单节点负载过重等情况.本文基于Ceph分布式存储系统的优势,采用raft一致性算法等设计并实现ISCSI高可用集群.ISCSI集群使用自定义的节点选择策略实现服务负载均衡,并通过raft分布式协议实现服务故障迁移.实验表明,本文提出的方案是有效的,能够实现服务故障迁移,保证集群负载均衡.