Storage device with instructions for performing methods of processing I/O requests
The invention classifies volumes (e.g., file systems or LUNs) of a data storage system according to application requirements and allocates space for the volumes on storage devices (e.g., hard disk drives) accordingly. A person such as an IT administrator configures the volumes specifying size, type (e.g., file system or SAN LUN), and priority (e.g., high, medium, low, or archive). The host schedules I/O requests to the storage devices in priority queues using the volume definition to match the application requirements and reduce storage seek time between volumes of different priorities. The host also allocates high performance bands of the storage devices to high performance applications and lower performance bands to lower performance applications. In this manner, the data storage system places data on the band of the storage device that best supports its performance needs.
1. A data storage device storing computer-executable instructions for performing a method of processing I/O requests, comprising:
accepting a priority for each of a plurality of volumes;
allocating a plurality of performance bands of zone bit recorded disk drives according to the priorities;
receiving I/O requests;
rearranging the I/O requests into a queue for each priority;
tagging each I/O request with the priority of its volume;
selecting a batch of I/O requests from the queues; and
executing the batch of I/O requests.
2. A data storage device storing computer-executable instructions for performing a method of processing I/O requests, comprising:
receiving a priority for each of a plurality of volumes;
assigning a performance band to each volume;
receiving I/O requests;
rearranging the I/O requests into priority queues;
selecting a batch of I/O requests from the queues; and
transmitting the I/O requests by priority batch to a zone bit recorded disk drive.
3. The data storage device of claim 2 , further comprising tagging I/O requests by priority after receiving the I/O requests and before rearranging the I/O requests.
4. The data storage device of claim 2 , further comprising receiving a definition of each volume by assigning priority, NAS or SAN, and a certain capacity.
5. The data storage device of claim 2 , wherein the priority is high, medium, low, or archive.
6. The data storage device of claim 2 , further comprising selecting I/O requests from each of a high, medium, low, and archive queue.
7. The data storage device of claim 2 , further comprising tagging the I/O requests with their priority and transmitting them as a batch to the data storage subsystem in order of priority.
8. The data storage device of claim 6 , further comprising sending high priority I/O requests to an outer band.
9. The data storage device of claim 6 , further comprising sending low priority I/O requests to an inner band.
10. The data storage device of claim 2 , further comprising retaining the I/O requests in order of priority.
11. The data storage device of claim 2 , further comprising sending I/O requests to the zone bit recorded disk drive, wherein the zone bit recorded disk drive retains the I/O requests in order of priority.
12. The data storage device of claim 2 , further comprising setting the I/O request bandwidth by priority.
13. The data storage device of claim 2 , further comprising assigning each priority a minimum percentage of I/O requests.
14. The data storage device of claim 2 , further comprising allocating the I/O request bandwidth by priority and by weighting each of the volumes.
15. The data storage device of claim 2 , further comprising aligning the boundary of each performance band with a data zone boundary of the zone bit recorded disk drive.
16. The data storage device of claim 2 , further comprising aligning the boundary of each performance band not on a data zone boundary of the zone bit recorded disk drive.