Page cache write logging at block-based storage

A method, comprising:

• performing, by one or more computing devices:
• evaluating, by a control plane, storage nodes that maintain replicas of data volumes, to determine durability scores of the storage nodes, the durability scores for determining whether to implement page cache write logging on one or more of the storage nodes, wherein page cache write logging comprises:
• receiving, at a storage node, a write request for a data volume persisted in at least one block-based storage device maintained at the storage node;
• updating at least one corresponding entry of a plurality of entries in a page cache maintained in system memory at the storage node for the write request, wherein the plurality of entries in the page cache are flushed to the at least one block-based storage device in order to persistently update the data volume;
• storing a log record describing the update to the at least one corresponding page cache entry in a page cache write log maintained in a persistent storage device;
• and
• in response to updating the page cache entry and storing the log record in the page cache write log, acknowledging the write request as complete;
• and
• selecting by the control plane, based at least in part on one or more of the durability scores, one or more of the storage nodes to implement page cache write logging such that at least one storage node performs page cache write logging for a volume.

One or more non-transitory, computer-readable storage media, storing program instructions that when executed on or across one or more processors cause the one or more processors to implement a control plane to perform:

• evaluating storage nodes that maintain replicas of data volumes to determine durability scores of the storage nodes, the durability scores for determining whether to implement page cache write logging on one or more of the storage nodes, wherein page cache write logging comprises:
• subsequent to receiving, at a storage node, a write request for a data volume persisted in at least one block-based storage device maintained at the storage node:
• updating at least one corresponding entry of a plurality of entries in a page cache maintained in system memory at the storage node for the write request, wherein the plurality of entries in the page cache are flushed to the at least one block-based storage device in order to persistently update the data volume;
• storing a log record describing the update to the at least one corresponding page cache entry in a page cache write log maintained in persistent storage device;
• and
• in response to updating the page cache entry and storing the log record in the page cache write log, acknowledging the write request as complete;
• and
• selecting, based at least in part on one or more of the durability scores, one or more of the storage nodes to implement page cache write logging such that at least one storage node performs page cache write logging for a respective data volume of the data volumes.