Automatic site failover
    1.
    发明申请
    Automatic site failover 有权
    自动站点故障切换

    公开(公告)号:US20050229021A1

    公开(公告)日:2005-10-13

    申请号:US11111380

    申请日:2005-04-21

    IPC分类号: G06F11/00 G06F11/20

    摘要: A data storage system adapted to maintain redundant data storage sets at a destination location(s) is disclosed. The data storage system establishes a copy set comprising a source volume and a destination volume. Data written to a source volume is automatically copied to the destination volume. The data storage system maintains a data log that may be activated when the destination volume is inaccessible due to, for example, a malfunction in the destination storage system or in the communication link between the source system and the destination system. I/O commands and the data associated with those commands are written to the data log, and after a destination system becomes available the information in the data log is merged into the destination volume to conform the data in the destination volume to the data in the source volume. The data log competes for disk capacity with other volumes on the system, and log memory is allocated as needed. In operation, the array controllers monitor connection status between array controllers in a DRM group. When a connection failure is detected the controllers determine which of the remaining controllers determine whether the source controller remains online, and if not then which destination controller should assume the role of the source controller.

    摘要翻译: 公开了一种适于在目的地位置维护冗余数据存储组的数据存储系统。 数据存储系统建立包括源卷和目的地卷的复制集。 写入源卷的数据将自动复制到目标卷。 数据存储系统维护数据记录,当由于例如目的地存储系统中的故障或源系统与目的地系统之间的通信链路而导致目的地卷不可访问时,可能会被激活。 I / O命令和与这些命令相关联的数据被写入数据日志,并且在目标系统变得可用之后,将数据日志中的信息合并到目标卷中,以使目的卷中的数据符合目标卷中的数据 源音量。 数据日志与系统上的其他卷竞争磁盘容量,并根据需要分配日志内存。 在操作中,阵列控制器监视DRM组中阵列控制器之间的连接状态。 当检测到连接故障时,控制器确定哪些剩余控制器确定源控制器是否保持联机,如果不是,则哪个目标控制器应承担源控制器的作用。