International Business Machines Corporation

Komal Shailendra Shah

Subhojit Roy

Bharti Soni

Shrirang Shrikant Bhagwat

Shweta V Kulkarni

Anuj Chandra

Tej Parkash

Subhamay Barui

Tanmay Jayant Mujumdar

Sourab Gupta

Abhishek Jaiswal

Kanishka Keshav

A computer-implemented method, according to one approach, includes: sending a notification to a host regarding a first logical unit number (LUN) in response to receiving an indication that a first node will be taken offline. The first LUN that the notification is sent to has a preferred communication path that extends through the first node. Communication paths extending through the first node are blocked and communication paths extending through a second node are promoted. Moreover, in response to determining that existing I/O operations previously assigned to the first node have been completed, the first node is taken offline. I/O operations are thereby sent to the first LUN through the second node while the first node is offline.

Seamlessly implementing planned outages across network nodes

Described are techniques including a computer-implemented method that comprises defining a respective priority classification for each of a plurality of sockets used for communicating between an initiator computational system and a target computational system. The method further comprises automatically assigning a respective priority classification to each of a plurality of Input/Output (IO) requests based on a type of data associated with each IO request. The method further comprises sending the plurality of IO requests to respective sockets of the plurality of sockets with a matching priority classification.

Data traffic prioritization based on content

In one embodiment, a method includes determining at least one characteristic of a plurality of ports on an individual basis. The plurality of ports are hosted by a target system and configured to send and receive data. The method also includes creating port groupings, each port grouping including one or more of the plurality of ports. Ports are grouped together in a single port grouping based on at least one shared characteristic of individual ports in the single port grouping. In addition, the method includes receiving, from an initiator port, a target discovery request at a target port of the plurality of ports. Also, the method includes determining which particular port grouping the target port belongs to. Moreover, the method includes sending information about all ports in the particular port grouping to the initiator port in response to receiving the target discovery request from the initiator port.

Storage target discovery in a multi-speed and multi-protocol ethernet environment

Described herein are techniques for managing replication in a data storage environment. The techniques including selectively compressing and selectively encrypting, by a production site, a set of files for replication from the production site to a remote site. Files can be selectively compressed based on a compression ratio satisfying a compression threshold, and files can be selectively encrypted based on a file content satisfying an encryption criteria. The techniques can further include updating, by the production site, metadata associated with selectively compressed files and updating metadata associated with selectively encrypted files. The techniques can further include replicating the set of files for replication from the production site to the remote site, the set of files for replication including the selectively compressed and the selectively encrypted files.

Selective compression and encryption for data replication

Computer implemented methods for selective data deduplication in a multitenant environment are disclosed. Data deduplication of blocks written to a storage area associated with a tenant and redundant copies of the blocks written to other storage areas of other tenants is permitted or prevented based on tagging the first storage area associated with the tenant with a particular type of parameter. Responsive to detecting a write operation directed to the storage area tagged with a parameter indicating that deduplication is not permitted, a block to be written to the storage area is modified prior to hashing the block. Responsive to detecting a write operation directed to the storage area tagged with a parameter indicating that deduplication is permitted, a block to be written to the storage area is prevented from being modified prior to hashing the block.

Selective data deduplication in a multitenant environment

Apparatuses, methods, systems, and program products are disclosed for cluster configuration backup and recovery. One method includes receiving, by use of a processor, configuration data for a cluster. The method includes storing the configuration data for the cluster. The method also includes forming a machine-readable code that corresponds to the stored configuration data for the cluster. The machine-readable code may be used for restoring the stored configuration data to the cluster.

Apparatus, method, and program product for cluster configuration data backup and recovery

Described herein are techniques for managing failover in a data center environment interconnected using an internet small computer systems interface (iSCSI) communication protocol, the techniques including receiving, at a host and from a kernel driver, an asynchronous message comprising an indication of a failed path associated with a first node having a first port, a list of internet protocol (IP) addresses associated with a plurality of failover paths including a first failover path associated with a second node having a second port, and an expiration. The techniques further including performing, by the host and before the expiration, a first input/output (I/O) operation on the second port associated with the second node. The techniques further including performing, by the host and after the expiration, a second I/O operation on the first port of the first node.

Host multipath layer notification and path switchover following node failure

A controller of a data storage system reconfigures a target storage node within the data storage system including by assigning the target storage node a new target node name in place of a former target node name. The controller provides a reconfiguration notification, the former target node name, and the new target node name to a host platform having an ongoing first communication session with the target storage node. Following the reconfiguration notification, the controller responds to a login request of the host platform and establishes a new second communication session between the host platform and the target storage node. The host platform can logout of the now-stale first communication session after the second communication session is established.

Updating host discovery records based on target reconfiguration

Embodiments for optimizing connectivity in a storage system by a processor. A preferred connectivity path may be determined between a host and a storage controller via one or more selected nodes, one or more storage virtualization systems, or combination thereof. A current connectivity path between the host and the storage controller may be determined to fail to match the preferred connectivity path. The host may be triggered to reconnect to the storage controller via the preferred connectivity path to enhance connectivity to between the host and the storage controller.

Optimizing connectivity in a storage system data

A computer-implemented method according to one embodiment includes establishing, by an initiator, a discovery session type. A request is sent by the initiator for identifying a target. The request includes an identity key value pair that specifies at least one target identity, and a target characteristic key value pair that specifies a target characteristic. A response is received by the initiator from a target matching the key value pairs. The response includes path information of the target. In response to receiving the response the target is connected to by the initiator using the path information. A computer program product for establishing a connection between an initiator and a target according to one embodiment includes a computer readable storage medium having program instructions embodied therewith. The program instructions are readable and/or executable by an initiator to cause the initiator to perform the foregoing method.

Growing community of inventors

Pune, India

Komal Shailendra Shah