Queuing read requests based on write requests

A client computer in an extent-based storage system having two or more storage tiers, an extent being a contiguous area of storage, the client computer having a processor configured to perform a method for reading data stored in a storage tier of the client computer, the method comprising:

• providing, by a first client computer, write access permission to a particular volume of a storage device on the first client computer to a storage controller, wherein the storage device is communicatively coupled to the storage controller;
• providing, by the first client computer, a first granularity level for the write access permission for the particular volume of the storage device of the first client computer, and providing a first duration for the write access permission, wherein the first granularity level specifies a subset of the particular volume, and the first duration includes a start time and a duration time;
• receiving, by the first client computer, a write request notification from the storage controller of a first write request to a record on the particular volume;
• receiving, by the first client computer, a write notification from the storage controller, the write notification indicating that a write corresponding with the write request notification has been committed to the storage device;
• queuing a read request within the first granularity level to the storage device by the first client computer for a time period ending with the receiving of the write notification;
• and
• performing, by the first client computer, the queued read request in response to the receiving the write notification;
• wherein the receiving the write request notification, the receiving the write notification, and the performing the queued read request all occur after the start time and before an end of the first duration.

A computer program product comprising a non-transitory computer readable storage medium having program instructions embodied therewith, the program instructions configured to cause a processor of a client computer in an extent-based storage system having two or more storage tiers, an extent being a contiguous area of storage, to perform a method for reading data stored in a storage tier of the client computer, the method comprising:

• providing, by a first client computer, write access permission to a particular volume of a storage device on the first client computer to a storage controller, wherein the storage device is communicatively coupled to the storage controller;
• providing, by the first client computer, a first granularity level for the write access permission for the particular volume of the storage device of the first client computer, and providing a first duration for the write access permission, wherein the first granularity level specifies a subset of the particular volume, and the first duration includes a start time and a duration time;
• receiving, by the first client computer, a write request notification from the storage controller of a first write request to a record on the particular volume;
• receiving, by the first client computer, a write notification from the storage controller, the write notification indicating that a write corresponding with the write request notification has been committed to the storage device;
• queuing a read request within the first granularity level to the storage device by the first client computer for a time period ending with the receiving of the write notification;
• and
• performing, by the first client computer, the queued read request in response to the receiving the write notification;
• wherein the receiving the write request notification, the receiving the write notification, and the performing the queued read request all occur after the start time and before an end of the first duration.