Abstract: Staging data on a storage element integrating fast durable storage and bulk durable storage, including: receiving, at a storage element integrating fast durable storage and bulk durable storage, a data storage operation from a host computer; storing data corresponding to the data storage operation within fast durable storage in accordance with a first data resiliency technique; and responsive to detecting a condition for transferring data between fast durable storage and bulk durable storage, transferring the data from fast durable storage to bulk durable storage in accordance with a second data resiliency technique.

Abstract: Consistently selecting a group of datasets during recovery, including: for each of a plurality of datasets: generating a respective identifier corresponding to a respective dataset, wherein the respective identifier is different from each other identifier; and storing the respective identifier to represent successful storage of the respective dataset; and responsive to recovering from a system interruption: extracting identifier information from all readable datasets; and generating, in dependence upon the extracted identifiers, a group of datasets from among the readable datasets.

Abstract: Maintaining identifier service consistency within a storage system, including, responsive to a write operation for a dataset: assigning an identifier for the write operation, wherein the identifier is equal to a current identifier from an allowable set of identifiers; storing, within a metadata header for the dataset, metadata indicating the assigned identifier; and incrementing the current identifier; and responsive to determining that the incremented current identifier has caused a reservation event: updating a range corresponding to the allowable set of identifiers.

Abstract: Maintaining metadata consistency among storage devices failures, which includes: for each of a plurality of datasets: writing, on different storage devices of a respective write group, a respective plurality of copies of a respective dataset corresponding to a respective identifier, where at least one copy of the respective dataset remains readable after less than a threshold number of storage device failures within the write group; and responsive to recovering from a system interruption: generating a catalog of valid datasets based on one or more identifiers stored among readable storage devices of the respective write groups.

Abstract: Staging data on a storage element integrating fast durable storage and bulk durable storage, including: receiving, at a storage element integrating fast durable storage and bulk durable storage, a data storage operation from a host computer; storing data corresponding to the data storage operation within fast durable storage in accordance with a first data resiliency technique; and responsive to detecting a condition for transferring data between fast durable storage and bulk durable storage, transferring the data from fast durable storage to bulk durable storage in accordance with a second data resiliency technique.