US 9,069,571 B2Granted

Propagation of unique device names in a cluster system

AssigneeInternational Business Machines Corporation

InventorsEric P. Fried, Rajeev Mishra, Lance W. Russell, Chris A. Schwendiman, Stephen M. Tee, Stephen J. Tovcimak

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Abstract

A unique device name is assigned to each of a plurality of shared storage devices in a cluster configuration database defining membership of nodes in a cluster. A particular node among the nodes defined by the cluster configuration database as a member of the cluster searches the cluster configuration database for a device identifier matching a device identifier of a shared storage device hosted by the particular node. In response to finding a matching device identifier in the cluster configuration database, the particular node renames, in a local configuration maintained at the particular node, a storage device associated with the matching device identifier with the unique name assigned to that storage device in the cluster configuration database.

Claims6

Dependent claims

A method of data processing in a cluster system, the method comprising:

in a cluster configuration database residing on a trusted shared data storage device of a host node of a cluster, defining multiple nodes as members of the cluster;
with reference to the cluster configuration database, centrally assigning a respective one of a plurality of unique device names to each of a plurality of shared storage devices in the cluster without querying the plurality of shared storage devices for device names, wherein the assigning includes:
generating a portion of each of the plurality of unique device names of the plurality of shared storage devices utilizing a monotonically advancing counter maintained on the trusted shared storage device;
forming each of the plurality of unique device names by concatenating a value of the monotonically advancing counter with a reserved constant maintained on the trusted shared storage device;
a particular node among the nodes defined as members of the cluster by the cluster configuration database searching the cluster configuration database on the trusted shared storage device for a device identifier matching a device identifier of a shared storage device hosted by the particular node, wherein the particular node is a different node than the host node;
in response to finding a matching device identifier in the cluster configuration database, the particular node renaming, in a local configuration maintained at the particular node, a storage device associated with the matching device identifier with a unique device name assigned to that storage device in the cluster configuration database;
and
in response to a stimulus indicating configuration of an added node into the cluster:
the added node determining whether or not the added node has a universally unique identifier (UUID) and, if not, the added node internally generating its own persistent self-assigned UUID;
the added node searching the cluster configuration database for a temporary identifier associated with the added node;
and
in response to the added node locating the temporary identifier of the added node in the cluster configuration database, the added node writing its self-assigned UUID into the cluster configuration database and joining the cluster.

9 more elements

A program product, comprising:

a computer readable storage device;
and
program code stored within the computer readable storage device that, when executed by a computer, causes the computer to perform:
defining, in a cluster configuration database residing on a trusted shared data storage device of a host node of a cluster, multiple nodes as members of the cluster;
with reference to the cluster configuration database, centrally assigning a respective one of a plurality of unique device names to each of a plurality of shared storage devices in the cluster without querying the plurality of shared storage devices for device names, wherein the assigning includes:
generating a portion of each of the plurality of unique device names of the plurality of shared storage devices utilizing a monotonically advancing counter maintained on the trusted shared storage device;
forming each of the plurality of unique device names by concatenating a value of the monotonically advancing counter with a reserved constant maintained on the trusted shared storage device;
a particular node among the nodes defined as members of the cluster by the cluster configuration database searching the cluster configuration database on the trusted shared storage device for a device identifier matching a device identifier of a shared storage device hosted by the particular node, wherein the particular node is a different node than the host node;
and
in response to finding a matching device identifier in the cluster configuration database, the particular node renaming in a local configuration maintained at the particular node a storage device associated with the matching device identifier with a unique device name assigned to that storage device in the cluster configuration database;
and
in response to a stimulus indicating configuration of an added node into the cluster:
the added node determining whether or not the added node has a universally unique identifier (UUID) and, if not, the added node internally generating its own persistent self-assigned UUID;
the added node searching the cluster configuration database for a temporary identifier associated with the added node;
and
in response to the added node locating the temporary identifier of the added node in the cluster configuration database, the added node writing its self-assigned UUID into the cluster configuration database and joining the cluster.

13 more elements

A cluster data processing system, comprising:

multiple nodes including processing resources and data storage, wherein the multiple nodes include at least a host node and a different local node, the local node including:
a processor;
local data storage coupled to the processor, the local data storage including a shared storage device, wherein the local data storage further stores a local configuration of the local node;
and
program code stored within the data storage that, when executed by the data processing system, causes at least one of the multiple nodes to perform:
defining, in a cluster configuration database residing on a trusted shared data storage device of a host node of a cluster, the multiple nodes as members of the cluster;
with reference to the cluster configuration database, centrally assigning a respective one of a plurality of unique device names to each of a plurality of shared storage devices in the cluster without querying the plurality of shared storage devices for device names, wherein the assigning includes:
generating a portion of each of the plurality of unique device names of the plurality of shared storage devices utilizing a monotonically advancing counter maintained on the trusted shared storage device;
forming each of the plurality of unique device names by concatenating a value of the monotonically advancing counter with a reserved constant maintained on the trusted shared storage device;
wherein the program code further causes the local node to perform:
searching the cluster configuration database on the trusted shared storage device for a device identifier matching a device identifier of the shared storage device hosted by the local node;
and
in response to finding a matching device identifier in the cluster configuration database, the local node renaming, in the local configuration maintained in the local data storage, a storage device associated with the matching device identifier with a unique device name assigned to that storage device in the cluster configuration database;
and
wherein the program code further causes an added node to perform:
in response to a stimulus indicating configuration of the added node into the cluster:
the added node determining whether or not the added node has a universally unique identifier (UUID) and, if not, the added node internally generating its own persistent self-assigned UUID;
the added node searching the cluster configuration database for a temporary identifier associated with the added node;
and
in response to the added node locating the temporary identifier of the added node in the cluster configuration database, the added node writing its self-assigned UUID into the cluster configuration database and joining the cluster.

17 more elements

Dependencies are inferred from the claim text.