A method comprising: hosting a persistent memory storage tier and a storage file system tier within a storage operating system storage stack of a node, wherein the persistent memory storage tier is configured to manage a persistent memory file system that stores data within persistent memory according to byte-addressable access, wherein the storage file system tier is configured to manage a storage file system that stores data within a storage device (528, 530) according to block-addressable access, and wherein the persistent memory storage tier manages the persistent memory at a higher level within the storage operating system storage stack than a level at which the storage file system is managed such that operations targeting the storage file system are intercepted by the persistent memory storage tier before reaching the storage file system tier; intercepting, by the persistent memory storage tier, an operation targeting the storage file system; in response to determining that the operation is to be executed through the storage file system, invoking the storage file system to execute the operation upon the storage device (528, 530) according to the block-addressable access; and in response to determining that the operation is to be executed through the persistent memory file system: retargeting, by the persistent memory storage tier, the operation from targeting the storage file system to targeting persistent memory; and invoking the persistent memory file system to execute the operation upon the persistent memory according to the byte-addressable access. hosting a persistent memory storage tier and a storage file system tier within a storage operating system storage stack of a node, wherein the persistent memory storage tier is configured to manage a persistent memory file system that stores data within persistent memory according to byte-addressable access, wherein the storage file system tier is configured to manage a storage file system that stores data within a storage device (528, 530) according to block-addressable access, and wherein the persistent memory storage tier manages the persistent memory at a higher level within the storage operating system storage stack than a level at which the storage file system is managed such that operations targeting the storage file system are intercepted by the persistent memory storage tier before reaching the storage file system tier; wherein the persistent memory storage tier is configured to manage a persistent memory file system that stores data within persistent memory according to byte-addressable access, wherein the storage file system tier is configured to manage a storage file system that stores data within a storage device (528, 530) according to block-addressable access, and wherein the persistent memory storage tier manages the persistent memory at a higher level within the storage operating system storage stack than a level at which the storage file system is managed such that operations targeting the storage file system are intercepted by the persistent memory storage tier before reaching the storage file system tier; intercepting, by the persistent memory storage tier, an operation targeting the storage file system; in response to determining that the operation is to be executed through the storage file system, invoking the storage file system to execute the operation upon the storage device (528, 530) according to the block-addressable access; and in response to determining that the operation is to be executed through the persistent memory file system: retargeting, by the persistent memory storage tier, the operation from targeting the storage file system to targeting persistent memory; and invoking the persistent memory file system to execute the operation upon the persistent memory according to the byte-addressable access. retargeting, by the persistent memory storage tier, the operation from targeting the storage file system to targeting persistent memory; and invoking the persistent memory file system to execute the operation upon the persistent memory according to the byte-addressable access.