Block-storage service supporting multi-attach and health check failover mechanism

A system, comprising:

• one or more computing devices configured to implement a block storage system, wherein the block storage system is configured to:
• host a plurality of volumes;
• enable at least one of the volumes to be attached to multiple virtual machines, wherein the volume appears as a locally attached storage device to each of the multiple virtual machines;
• receive a write request from a first one of the virtual machines attached to the volume and commit a write included in the write request to the volume, wherein the multiple virtual machines remain attached to the volume while receiving and committing the write;
• and
• receive a second write request from a different one of the virtual machines attached to the volume and commit another write included in the second write request to the volume, wherein the multiple virtual machines remain attached to the volume while receiving and committing the other write.

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

• attach multiple virtual machines to a volume hosted by a block-storage service, wherein the volume appears as a locally attached storage device to each of the multiple virtual machines;
• commit, in the volume, a write received from a first one of the virtual machines while the volume remains attached to the multiple virtual machines;
• and
• commit, in the volume, a write received from a second one of the virtual machines while the volume remains attached to the multiple virtual machines.

A method, comprising:

• attaching multiple virtual machines to a volume of a block-storage service, wherein the volume appears as a locally attached storage device to each of the multiple virtual machines;
• committing a write received from a first one of the virtual machines in the volume while the volume remains attached to the multiple virtual machines;
• and
• committing a write received from a second one of the virtual machines in the volume while the volume remains attached to the multiple virtual machines.