I/O device and computing host interoperation
Methods, systems and computer-readable storage media for receiving, via an external interface of a storage device, a command from a computing host, the command including at least one non-standard command modifier, executing the command according to a particular non-standard command modifier, storing an indication of the particular non-standard command modifier in an entry of a map associated with a logical block address of the command, and storing a shadow copy of the map in a memory of the computing host.
1. A method comprising:
receiving, via an external interface of a storage device, a command from a computing host, the command comprising at least one non-standard command modifier;
executing the command according to a particular non-standard command modifier;
storing an indication of the particular non-standard command modifier in an entry of a map associated with a logical block address (LBA) of the command; and
storing a shadow copy of the map in a memory of the computing host.
2. The method of claim 1 , wherein the command identifies one of a plurality of data destinations, the data destinations comprising a plurality of data bands.
3. The method of claim 2 , wherein the data bands are dynamically changeable in number, arrangement, size and type and correspond to at least one of a database journal data band, a hot data band, and a cold data band.
4. The method of claim 3 , wherein the database journal data band is reserved for database journal type data.
5. The method of claim 3 , wherein in response to the computing host writing a long sequential stream, the hot data band grows in size.
6. The method of claim 1 , wherein the command comprises location information obtained at least in part by the computing host from a memory device of an I/O card coupled to the computing host.
7. The method of claim 1 , subsequent to the executing the command and without having received a trim command, further comprising accessing a determination to trim, rather than to recycle, at least a portion of data.
8. A storage system comprising:
a memory;
a host interface coupled to a computing host; and
a storage controller communicatively coupled to the host interface and the memory, the storage controller configured to
receive a command from the computing host, the command comprising at least one non-standard command modifier;
execute the command according to a particular non-standard command modifier; and
store an indication of the particular non-standard command modifier in an entry of a map associated with a logical block address (LBA) of the command, wherein a shadow copy of the map is stored in a memory of the computing host.
9. The storage system of claim 8 , wherein the storage controller is further configured to determine whether a stored portion of data has information corresponding to LBAs associated with at least one read command received via an external interface of the storage system.
10. The storage system of claim 8 , wherein the storage controller is further configured to
determine whether a stored portion of data comprises information corresponding to LBAs associated with a first write command; and
change the stored portion of data selectively as required in view of the determining, wherein the stored portion of data comprises the information corresponding to LBAs associated with the first write command.
11. The storage system of claim 8 , wherein the command identifies a particular one of a plurality of data destinations, the data destinations comprising a plurality of data bands.
12. The storage system of claim 11 , wherein the data bands are dynamically changeable in number, arrangement, size and type and correspond to one or more of a database journal data band, a hot data band, and a cold data band.
13. The storage system of claim 12 , wherein in response to the computing host writing a long sequential stream, the hot data band grows in size.
14. The storage system of claim 12 , wherein the cold data band is used at least for data from a recycler.
15. The storage system of claim 8 , wherein the command comprises location information obtained at least in part by the computing host from a memory device of an I/O card coupled to the computing host.
16. The storage system of claim 8 , wherein at least a portion of the memory of the computing host is in an address space accessible by the storage controller.
17. A non-transitory computer readable storage medium having processor-executable instructions stored thereon that, when executed by a processor, cause the processor to:
receive a command from a computing host, the command comprising at least one non-standard command modifier;
execute the command according to a particular non-standard command modifier; and
store an indication of the particular non-standard command modifier in an entry of a map associated with a logical block address (LBA) of the command, wherein a shadow copy of the map is stored in a memory of the computing host.
18. The non-transitory computer readable storage medium of claim 17 , wherein the command identifies a particular one of a plurality of data destinations, the data destinations comprising a plurality of data bands.
19. The non-transitory computer readable storage medium of claim 18 , wherein the data bands are dynamically changeable in number, arrangement, size and type and correspond to one or more of a database journal data band, a hot data band, and a cold data band.
20. The non-transitory computer readable storage medium of claim 17 , wherein the command comprises location information obtained at least in part by the computing host from a memory device of an I/O card coupled to the computing host.