Data storage system with shared cache address space
View Patent ↗An apparatus for a node of a peer-to-peer network having a plurality of nodes comprises one or more I/O adapters; a cache component; one or more inter-node routing components; a memory mapping component for presenting to the I/O adapters a single address space mapped across a plurality of memory elements each associated with the cache component; and a direct memory access component for performing a memory operation on the memory elements via the memory mapping component on behalf of the I/O adapters.
1. A method comprising:
in response to a receiving host adapter receiving a read command directed to a virtual disk location from a requesting host, allocating a buffer in a cache memory corresponding to said receiving host adapter;
determining an identity of a physical disk array corresponding to said virtual disk location;
in response to determining said identity of said physical disk array location, writing data associated with said read command to said buffer;
in response to said writing said data, reading said data from said buffer; and
in response to said reading said data, sending said data to said requesting host.
2. The method according to claim 1 , wherein said writing said data further comprises:
writing said data to said buffer utilizing a direct memory access.
3. The method according to claim 1 , wherein said reading said data further comprises:
reading said data from said buffer utilizing a direct memory access.
4. The method according to claim 1 , further comprising:
determining an identity of said cache adapter corresponding to said receiving host adapter.
5. The method according to claim 4 , further comprising:
in response to determining said cache layer corresponding to said receiving host adapter, enqueuing a request to allocate a buffer in said cache memory.