Methods and systems of host caching

Details Methods and systems of host caching Methods and systems of host caching

2005-11-15

2005-11-15

Peikari, Behzad James (Department: 2189)

Electrical computers and digital processing systems: memory

Address formation

Address mapping

C711S119000, C711S129000

Reexamination Certificate

active

06965979

ABSTRACT:
The invention relates to host caching in data storage systems. In an embodiment, the invention provides a first host and a second host, each having memory. The host memory includes nonvolatile and volatile portions available for cache. Each host logically owns its volatile memory and the other host's nonvolatile memory. By assigning ownership in this way data can be transmitted between the hosts with little communication overhead. In addition, if the first host fails between write acknowledgment and destaging the write data, the write data is safely stored in the second nonvolatile memory of the second host. Thus, the second host can destage the data from the second nonvolatile memory. In addition, the host cache writes and reads the data rapidly by its nature.

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