Persistent data structure to track and manage SSD defects
An embodiment of an electronic apparatus may include one or more substrates, and logic coupled to the one or more substrates, the logic to control access to a persistent storage media based on a block and sub-block access structure, store a data structure in the persistent storage media to track read fails at a sub-block granularity for a word-line for every block, and update the data structure in response to a read fail on a block to indicate a failed sub-block that corresponds to the read fail for a word-line for the block. Other embodiments are disclosed and claimed.
1. An electronic apparatus, comprising:
one or more substrates; and
logic coupled to the one or more substrates, the logic to:
control access to a persistent storage media based on a block and sub-block access structure,
store a data structure in the persistent storage media to track read fails at a sub-block granularity for a word-line for every block, wherein the data structure comprises a bitmap structure and wherein the logic to store the data structure comprises the logic to store the bitmap structure in a one-time-programmable portion of the persistent storage media, and
update the data structure in response to a read fail on a block to indicate a failed sub-block that corresponds to the read fail for a word-line for the block.
2. The electronic apparatus of claim 1 , wherein the logic is further to:
move only an affected sub-block contents to another block in response to the read fail on the block.
3. The electronic apparatus of claim 1 , wherein the logic is further to:
determine if the data structure indicates any failed sub-blocks for a block in response to a request to erase the block; and, if so determined,
dummy program any indicated failed sub-blocks for the block.
4. The electronic apparatus of claim 3 , wherein the logic is further to:
read the data structure from the persistent storage media in response to a power interruption.
5. The electronic apparatus of claim 1 , wherein the logic is further to:
read the bitmap structure from the one-time-programmable portion of the persistent storage media.
6. The electronic apparatus of claim 5 , wherein the logic is to read the bitmap structure from the one-time-programmable portion of the persistent storage media comprises the logic to issue an unlock command sequence, issue a read command, and issue a reset or an exit command.
7. The electronic apparatus of claim 1 , wherein the persistent storage media comprises one or more of NAND-based media and 3D crosspoint media.
8. An electronic storage system, comprising:
persistent storage media;
a controller to control access to the persistent storage media based on a block and sub-block access structure; and
logic communicatively coupled to the controller and the persistent storage media, the logic to:
store a data structure in the persistent storage media to track read fails at a sub-block granularity for a word-line for every block, wherein the data structure comprises a bitmap structure and wherein the logic to store the data structure comprises the logic to store the bitmap structure in a one-time-programmable portion of the persistent storage media, and
update the data structure in response to a read fail on a block to indicate a failed sub-block that corresponds to the read fail for a word-line for the block.
9. The electronic storage system of claim 8 , wherein the logic is further to:
move only an affected sub-block contents to another block in response to the read fail on the block.
10. The electronic storage system of claim 8 , wherein the logic is further to:
determine if the data structure indicates any failed sub-blocks for a block in response to a request to erase the block; and, if so determined,
dummy program any indicated failed sub-blocks for the block.
11. The electronic storage system of claim 10 , wherein the logic is further to:
read the data structure from the persistent storage media in response to a power interruption.
12. The electronic storage system of claim 8 , wherein the logic is further to:
read the bitmap structure from the one-time-programmable portion of the persistent storage media.
13. The electronic storage system of claim 12 , wherein the logic is to read the bitmap structure from the one-time-programmable portion of the persistent storage media comprises the logic to issue an unlock command sequence, issue a read command, and issue a reset or an exit command.
14. The electronic storage system of claim 8 , wherein the persistent storage media comprises one or more of NAND-based media and 3D crosspoint media.
15. A method of controlling storage, comprising:
controlling access to a persistent storage media based on a block and sub-block access structure;
storing a data structure in the persistent storage media to track read fails at a sub-block granularity for a word-line for every block, wherein the data structure comprises a bitmap structure and wherein storing the data structure comprises storing the bitmap structure in a one-time-programmable portion of the persistent storage media; and
updating the data structure in response to a read fail on a block to indicate a failed sub-block that corresponds to the read fail for a word-line for the block.
16. The method of claim 15 , further comprising:
moving only an affected sub-block contents to another block in response to the read fail on the block.
17. The method of claim 15 , further comprising:
determining if the data structure indicates any failed sub-blocks for a block in response to a request to erase the block; and, if so determined,
dummy programming any indicated failed sub-blocks for the block.
18. The method of claim 17 , further comprising:
reading the data structure from the persistent storage media in response to a power interruption.
19. The method of claim 15 , further comprising:
reading the bitmap structure from the one-time-programmable portion of the persistent storage media.
20. The method of claim 19 , wherein reading the bitmap structure from the one-time-programmable portion of the persistent storage media comprises issuing an unlock command sequence, issuing a read command, and issuing a reset or an exit command.