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Computer network remote data mirroring system

  • US 6,324,654 B1
  • Filed: 03/30/1998
  • Issued: 11/27/2001
  • Est. Priority Date: 03/30/1998
  • Status: Expired due to Term
First Claim
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1. A computer network remote data mirroring apparatus comprising:

  • a primary computer system for executing an application which generates data, the primary computer system comprising;

    a local data device;

    a writelog device including a cache memory and a dirty bit map disk drive device to which data can be written from the cache memory to avoid a memory overflow condition, the local data device and the writelog device together operating as a local data storage unit;

    a device driver for controlling transfer of the data to and from the local data device and the writelog device; and

    a primary mirror daemon executed by the primary computer system, the primary mirror daemon receiving the data from the writelog device through the device driver;

    a secondary computer system for replicating the data, the secondary computer system comprising;

    a mirror device onto which the data is replicated; and

    a remote mirror daemon executed by the secondary computer system; and

    a network for interconnecting the primary computer system and the secondary computer system, wherein the primary and secondary mirror daemons communicate over the network so that the primary mirror daemon transfers the data from the writelog device over the network to the remote mirror daemon and the remote mirror daemon replicates the data on the mirror device.

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