Managing global cache coherency and access permissions
First Claim
1. A method for managing global cache coherency and access permissions in a distributed shared caching for clustered file systems (CFS) in a clustered file system in a computing environment, the method comprising:
- providing the CFS for residing on a cluster of nodes for accessing space of data segments that are shared between the cluster of nodes;
providing, in the CFS, a local cache memory of data segment slots on each of the cluster of nodes and a distributed shared memory (DSM) module, with no internal memory for the data segments on each of the cluster of nodes, wherein the local cache memory acts as an external memory;
managing the access permissions to an entire space of the data segments by using the DSM module; and
while processing a request message from a remote DSM module to access one of the data segments;
including in a response message a permission to access the one of the data segments, anddeciding if one of a transfer of ownership and most recent contents of the one of the data segments should be included in the response message for the permission to access the one of the data segments, wherein last two components of the response message depend upon availability of the one of the data segments that is requested in a local external cache.
1 Assignment
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Accused Products
Abstract
Systems. Methods, and Computer Program Products are provided managing a global cache coherency and reducing messaging traffic for coordination of access permissions in a distributed shared caching for a clustered file systems (CFS). The CFS manages access permissions to an entire space of the data segments by using the DSM module. In response to processing a request message from a remote DSM module to access one of the data segments, including in a response message permission to access the one of the data segments, and deciding if one of a transfer of ownership, and most recent contents of the one of the data segments should be included in the response message for the permission to access the one of the data segments. The last two components of the response message depend upon availability of the one of the data segments that is requested in a local external cache.
7 Citations
21 Claims
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1. A method for managing global cache coherency and access permissions in a distributed shared caching for clustered file systems (CFS) in a clustered file system in a computing environment, the method comprising:
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providing the CFS for residing on a cluster of nodes for accessing space of data segments that are shared between the cluster of nodes; providing, in the CFS, a local cache memory of data segment slots on each of the cluster of nodes and a distributed shared memory (DSM) module, with no internal memory for the data segments on each of the cluster of nodes, wherein the local cache memory acts as an external memory; managing the access permissions to an entire space of the data segments by using the DSM module; and while processing a request message from a remote DSM module to access one of the data segments; including in a response message a permission to access the one of the data segments, and deciding if one of a transfer of ownership and most recent contents of the one of the data segments should be included in the response message for the permission to access the one of the data segments, wherein last two components of the response message depend upon availability of the one of the data segments that is requested in a local external cache. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for managing a global cache coherency and access permissions in a distributed shared caching for a clustered file systems (CFS) in a clustered file system, the system comprising:
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a cluster of nodes, the CFS including the cluster of nodes forming a computer cluster, data segments shared between the cluster of nodes, wherein the CFS resides on the cluster of nodes for accessing space of data segments that are shared between the cluster of nodes, a distributed shared memory (DSM) module, with no internal memory for the data segments on each of the cluster of nodes within a node of the cluster of nodes, a plurality of storage devices in communication with the CFS, a local cache memory of data segment slots on each of the cluster of nodes are included in the CFS, wherein the local cache memory acts as an external memory, a remote cache memory within each of the cluster of nodes, a cache associated with the node, a transaction journal associated with the CFS, and a processor device having a memory coupled to the processor device for controlling the CFS, wherein the processor device is assigned to the node and the node is in communication with the plurality of storage devices, wherein the processor device; manages the access permissions to an entire space of the data segments by using the DSM module; and while processing a request message from a remote DSM module to access one of the data segments; includes in a response message a permission to access the one of the data segments, and decides if one of a transfer of ownership and most recent contents of the one of the data segments should be included in the response message for the permission to access the one of the data segments, wherein last two components of the response message depend upon availability of the one of the data segments that is requested in a local external cache. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A computer program product for managing a global cache coherency and access permissions in a distributed shared caching for a clustered file systems (CFS) in a clustered file system using a processor device, the computer program product comprising a non-transitory computer-readable storage medium having computer-readable program code portions stored therein, the computer-readable program code portions comprising:
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a first executable portion that provides the CFS for residing on a cluster of nodes for accessing space of data segments that are shared between the cluster of nodes; a second executable portion that provides, in the CFS, a local cache memory of data segment slots on each of the cluster of nodes and a distributed shared memory (DSM) module, with no internal memory for the data segments on each of the cluster of nodes, wherein the local cache memory acts as an external memory and is included in the CFS; a third executable portion that manages a access permissions to an entire space of the data segments by using the DSM module; and while processing a request message from a remote DSM module to access one of the data segments, a fourth executable portion that; includes in a response message a permission to access the one of the data segments, and decides if one of a transfer of ownership and most recent contents of the one of the data segments should be included in the response message for the permission to access the one of the data segments, wherein last two components of the response message depend upon availability of the one of the data segments that is requested in a local external cache. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification