公开(公告)号：US20220004525A1

公开(公告)日：2022-01-06

申请号：US16918822

申请日：2020-07-01

Applicant: Oracle International Corporation

Inventor： Donald Allan Graves, JR. ,  Alan David Brunelle ,  Frederick S. Glover

IPC: G06F16/182 ,  G06F16/176 ,  G06F16/13 ,  G06K9/62

Abstract: A heatmap is used to identify access patterns of ranges of data blocks at specific times, in order to optimize the size of the set of replicate nodes, for the purpose of reducing access latency. In an embodiment, the heatmap is used to enforce minimum replication of each data block such as when a replicate node crashes and is replaced. In an embodiment, the heatmap is used to adjust the minimum replication of a data block such as during and after a demand spike. In an embodiment, each data block is replicated on a minimum amount of respective replicate nodes of a cluster. A first node requests access to data blocks. Based on the requesting the access, a heatmap is modified, and the data blocks are replicated to the first node. Based on the heatmap, the minimum amount of nodes in the respective replicate nodes for at least one data block is adjusted.

公开(公告)号：US20200218656A1

公开(公告)日：2020-07-09

申请号：US16242957

申请日：2019-01-08

Applicant: Oracle International Corporation

Inventor： Donald Allan Graves, JR. ,  Frederick S. Glover ,  Alan David Brunelle ,  Pranav Dayananda Bagur ,  James Bensson

IPC: G06F12/0808 ,  G06F12/084

Abstract: Techniques are provided for providing a fully active and non-replicated block storage solution in a clustered filesystem that implements cache coherency. In a clustered filesystem where one or more data blocks are stored in a respective cache of each host node of a plurality of host nodes, a request is received at a host node of the plurality of host nodes from a client device to write the one or more data blocks to a shared storage device. In response to the request, the one or more data blocks are stored in the cache of the host node and a particular notification is sent to another host node of the plurality of host nodes that the one or more data blocks have been written to the shared storage device. In response to receiving the notification, the other host node invalidates a cached copy of the one or more data blocks in the respective cache of the other host node.

公开(公告)号：US20180063229A1

公开(公告)日：2018-03-01

申请号：US15804203

申请日：2017-11-06

Applicant: Oracle International Corporation

Inventor： Frederick S. Glover ,  George Sanderson ,  Donald Allan Graves, JR.

IPC: H04L29/08 ,  G06F9/50

CPC classification number: H04L67/1002 ,  G06F9/5083

Abstract: Techniques are provided for exporting one or more file systems through multiple nodes of a cluster. One or more of the exported file systems may be simultaneously exported through a single node of the cluster. A bundle, or mapping, between a node in the cluster and a file system, is created. The bundle represents an amount of work assigned to the node. A bundle is reassigned from one node to another node in the cluster in response to a failover, an addition of a new node to the cluster, or in response to a load balancing determination.