中文摘要：

文章提出一种新的系统级容灾机制，服务在线迁移。该机制在生产中心正常服务的同时为其提供容灾能力，通过系统内核中的层次化请求过滤保证迁移数据一致性。经过测试与实际应用环境的检验，该系统在迁移开销、服务迁移后的有效性等方面均达到预期目标。

英文摘要：

A new mechanism of disaster recovery named service online migration（SOM） is proposed. disaster recovery can be provided when the production center is in normal service, and the consistency ofmi ensured by HRF. Test and application in reality indicate that SOM has achieved desired goals in expenses validity after service migration etc. Capability gration can of be of migration.