Handling cache and non-volatile storage (nvs) out of sync writes

A computer program product, the computer program product comprising a computer readable storage medium having program code embodied therewith, the program code executable by at least one processor to perform:

• at an end of a write for an Non-Volatile Storage (NVS) track of the NVS node, sending, with the NVS node, the NVS write statistics to a cache node, wherein, at an end of a write for a corresponding cache track of the cache node, the cache node determines that writes to the corresponding cache track and to the NVS track are out of sync based on identifying a different number of the writes to the NVS track than to the corresponding cache track using the NVS write statistics and cache write statistics;
• receiving, with the NVS node, a message from the cache node to set an NVS out of sync indicator in an NVS data control block for the NVS track to indicate that the writes to the NVS track and the corresponding cache track are out of sync;
• setting, with the NVS node, the NVS out of sync indicator in the NVS data control block for the NVS track, wherein the cache node, sets a cache out of sync indicator in a cache data control block for the corresponding cache track to indicate that the writes to the NVS track and the corresponding cache track are out of sync;
• and
• discarding, with the NVS node, the NVS track, wherein the cache node sets the cache track as pinned non-retryable due to the write being out of sync.

A computer system, comprising:

• one or more processors, one or more computer-readable memories and one or more computer-readable, tangible storage devices;
• and
• program instructions, stored on at least one of the one or more computer-readable, tangible storage devices for execution by at least one of the one or more processors via at least one of the one or more memories, to perform operations comprising:
• at an end of a write for an Non-Volatile Storage (NVS) track of the NVS node, sending, with the NVS node, the NVS write statistics to a cache node, wherein, at an end of a write for a corresponding cache track of the cache node, the cache node determines that writes to the corresponding cache track and to the NVS track are out of sync based on identifying a different number of the writes to the NVS track than to the corresponding cache track using the NVS write statistics and cache write statistics;
• receiving, with the NVS node, a message from the cache node to set an NVS out of sync indicator in an NVS data control block for the NVS track to indicate that the writes to the NVS track and the corresponding cache track are out of sync;
• setting, with the NVS node, the NVS out of sync indicator in the NVS data control block for the NVS track, wherein the cache node, sets a cache out of sync indicator in a cache data control block for the corresponding cache track to indicate that the writes to the NVS track and the corresponding cache track are out of sync;
• and
• discarding, with the NVS node, the NVS track, wherein the cache node sets the cache track as pinned non-retryable due to the write being out of sync.

A computer-implemented method, comprising:

• at an end of a write for an Non-Volatile Storage (NVS) track of the NVS node, sending, with the NVS node, the NVS write statistics to a cache node, wherein, at an end of a write for a corresponding cache track of the cache node, the cache node determines that writes to the corresponding cache track and to the NVS track are out of sync based on identifying a different number of the writes to the NVS track than to the corresponding cache track using the NVS write statistics and cache write statistics;
• receiving, with the NVS node, a message from the cache node to set an NVS out of sync indicator in an NVS data control block for the NVS track to indicate that the writes to the NVS track and the corresponding cache track are out of sync;
• setting, with the NVS node, the NVS out of sync indicator in the NVS data control block for the NVS track, wherein the cache node, sets a cache out of sync indicator in a cache data control block for the corresponding cache track to indicate that the writes to the NVS track and the corresponding cache track are out of sync;
• and
• discarding, with the NVS node, the NVS track, wherein the cache node sets the cache track as pinned non-retryable due to the write being out of sync.