Data availability in a constrained deployment of a high-availability system in the presence of pending faults

A high-availability (HA) storage system comprising:

• a first arbiter node and a first storage node of a plurality of nodes operating within a first failure domain, wherein the first arbiter node serves as an active arbiter to facilitate maintaining quorum for the HA storage system;
• a second arbiter node and a second storage node of the plurality of nodes operating within a second failure domain coupled in communication with the first failure domain, wherein the second arbiter serves as a backup arbiter;
• wherein each node of the plurality of nodes includes;
• a processing resource;
• and
• a non-transitory computer-readable medium, coupled to the processing resource, having stored therein instructions that when executed by the processing resource cause the processing resource to:
• receive, by a member of a plurality of members of a current configuration of the HA storage system including the first arbiter node, the first storage node and the second storage node;
• an indication of a pending fault impacting the first failure domain;
• responsive to receipt of the indication, initiating establishment of a new configuration for the HA storage system;
• having members including the first storage node, the second storage node and the second arbiter node;
• and
• responsive to a majority of the plurality of members installing the new configuration, enabling the second arbiter to serve as the active arbiter by transferring state information to the second arbiter.

A non-transitory machine readable medium storing instructions executable by a plurality of nodes associated with a constrained deployment of a high-availability (HA) storage system that are distributed between a first failure domain, including a first node and a second node of the plurality of nodes, and a second failure domain, including a third node and a fourth node of the plurality of nodes, the non-transitory machine readable medium comprising:

• instructions to establish an initial configuration of the HA storage system in which each node of the plurality of nodes has a weight and the weight of the second node is greater than the weights of all other of the plurality of nodes;
• instructions to serve, by the initial configuration, data to users of the HA storage system;
• instructions to receive, by a node of the plurality of nodes, an indication of a pending fault impacting the first failure domain;
• and
• instructions, responsive to receipt of the indication, to cause to be established, by the node, a new configuration for the HA storage system, in which the weight of the fourth node is greater than the weights of all other of the plurality of nodes by shifting a portion of the weight of the second node to the fourth node, wherein after impact of the pending fault, the HA storage system maintains an ability to serve data to the users as a result of the third node and the fourth node having quorum.