International Business Machines Corporation

Karrthik K G

Venkateswara Rao Puvvada

Saket Kumar

Ashish Pandey

Ravi Kumar Komanduri

Deepak Kumar Jha

Muthu Annamalai Muthiah

Ravindra Sure

Prashanth Shekar Shetty

Sanjiv Kumar

Shashikant Banerjee

Provided are a computer program product, system, and method receiving at a cache node notification of changes to files in a source file system served from a cache file system at the cache node. A cache file system is established at the cache node as a local share of a source file system at the source node. The source node establishes a local share of the cache file system at the cache node. Notification is received, from the source node, that the source node modified a source control file for a source file at the source node. In response to receiving the notification, a cache control file, for a cached file in the cache file system, is updated to indicate the source file at the source node is modified. A request is sent to the source node to obtain data for the source file indicated as modified.

Receiving at a cache node notification of changes to files in a source file system served from a cache file system at the cache node

Provided a computer program product, system, and method for notifying a cache file system of changes to files in a source file system served from the cache file system. The source node establishes a local share of a cache file system at the cache node. The cache file system at the cache node comprises a local share of a source file system at the source node. In response to modifying a source file in the source file system, a source control file for the source file in the local share of the cache file system is updated to indicate the source file is modified. In response to updating the source control file, sending, to the cache node, indication of the updating of the source control file to cause the cache node to update a cache control file to indicate a change to the source file at the source node.

Notifying a cache file system of changes to files in a source file system served from the cache file system

A computer-implemented method according to one embodiment includes receiving, from an application at a metadata node of a clustered computing system, a request for a file, identifying, by the metadata node, a subset of data nodes within the clustered computing system where a portion of the file is stored, determining, by the metadata node, a data node within the subset of data nodes storing the portion of the file in a cache of the data node, and returning to the application, by the metadata node, a location of the portion of the file at the data node storing the portion of the file in the cache of the data node.

Caching file data within a clustered computing system

A system identifies (I) a first independent filesystem that (i) includes a file and (ii) uses file-handles to locate files and (II) a second independent filesystem that (i) operates independently of file-handles, associated with the first independent filesystem, when locating files and (ii) includes a copy of the file. The system generates a file-handle for the copy of the file on an inode of first independent filesystem based on a full-path for the copy of the file on the second independent filesystem. The system replicates one or more data blocks between the first independent filesystem and the second independent filesystem based, at least in part, on the full-path.

Continuous asynchronous replication from on-premises storage to cloud object stores

A computer-implemented method according to one embodiment includes initiating a file system interface in a kernel space of a system cluster, capturing a data access request sent from a user space of the system cluster, utilizing the file system interface, where the data access request is sent utilizing one or more protocols of a first file system, and redirecting the data access request to a second file system of the system cluster, utilizing the file system interface.

Hot-pluggable file system interface

A computer-implemented method according to one embodiment includes receiving, on a first gateway node of a first cluster site, an input/output (I/O) request for a first fileset, and determining a collection of mount operations in which to add the I/O request for the first fileset. The determining includes hashing information of the first fileset against more than one collection of mount operations. The method further includes adding the I/O request for the first fileset to a first determined collection of mount operations, and outputting the first determined collection of mount operations to a first network file system (NFS) server. The first NFS server is one of a plurality of NFS servers of a second cluster site. Moreover, the first NFS server and at least one other NFS server of the plurality of NFS servers are configured to receive a collection of mount operations from the first gateway node.

Inter-cluster data transfer between file systems

A computer-implemented method, according to one embodiment, includes: establishing a recovery cluster as an acting primary cluster in response to determining that a primary cluster has gone offline. In response to determining that the primary cluster is back online, the acting primary cluster is synched with the online primary cluster by: capturing a snapshot of the acting primary cluster, and pausing a normal queue of the acting primary cluster. The snapshot of the acting primary cluster is further compared with a most recent snapshot of the online primary cluster, and each difference therebetween is added to a priority queue of the acting primary cluster. Each of the differences in the priority queue are transmitted to the online primary cluster, followed by the entries in the normal queue in response to determining that each of the differences in the priority queue have been transmitted to the online primary cluster.

Growing community of inventors

Kodaikanal, India

Karrthik K G