Storage management system and method
A method, computer program product, and computing system for processing memory page metadata received from a cache memory system within a data storage system to determine if the memory page metadata includes corruption due to a power failure event; if the memory page metadata includes post-acknowledgement data corruption, initiating a data recovery process to attempt to recover content associated with the post-acknowledgement data corruption; and if the memory page metadata includes pre-acknowledgement data corruption, reobtaining content associated with the pre-acknowledgement data corruption.
1. A computer-implemented method, executed on a computing device, comprising:
processing memory page metadata received from a cache memory system within a data storage system to determine if the memory page metadata includes corruption due to a power failure event, wherein the memory page metadata identifies a location of a memory page within the cache memory system and includes header information, a payload, and footer information, wherein processing memory page metadata received from a cache memory system within a data storage system to determine if the memory page metadata includes corruption due to a power failure event includes:
comparing a sequence ID included within the header information of the memory page metadata to a sequence ID included within the footer information, and
examining a checksum included within the memory page metadata to determine if the memory page metadata was corrupted during the power failure event, wherein the checksum is a checksum of the header information and the payload,
wherein a bad checksum in combination with a mismatch between the sequence ID included within the header information and the sequence ID included within the footer information indicates a write split due to the power failure event, and
wherein a bad checksum in combination with the sequence IDs in both the header information and the footer information being either invalid or matched indicates data corruption during the power failure event;
in response to the sequence IDs in both the header information and the footer information being invalid, initiating a data recovery process to attempt to recover content associated with data corruption, wherein the data recovery process includes a File System Consistency Check (FSCK); and
in response to a bad checksum in combination with a mismatch between the sequence ID included within the header information and the sequence ID included within the footer information, reobtaining content associated with pre-acknowledgement data corruption.
2. The computer-implemented method of claim 1 wherein reobtaining content associated with the pre-acknowledgement data corruption includes:
deleting the memory page metadata that includes the pre-acknowledgement data corruption; and
deleting content currently associated with the pre-acknowledgement data corruption.
3. The computer-implemented method of claim 2 wherein reobtaining content associated with the pre-acknowledgement data corruption further includes:
obtaining replacement content associated with the pre-acknowledgement data corruption from a client; and
generating replacement memory page metadata for the replacement content.
4. The computer-implemented method of claim 3 wherein reobtaining content associated with the pre-acknowledgement data corruption further includes:
storing the replacement content and the replacement memory page metadata on the cache memory system.
5. A computer program product residing on a computer readable medium having a plurality of instructions stored thereon which, when executed by a processor, cause the processor to perform operations comprising:
processing memory page metadata received from a cache memory system within a data storage system to determine if the memory page metadata includes corruption due to a power failure event, wherein the memory page metadata identifies a location of a memory page within the cache memory system and includes header information, a payload, and footer information, wherein processing memory page metadata received from a cache memory system within a data storage system to determine if the memory page metadata includes corruption due to a power failure event includes:
comparing a sequence ID included within the header information of the memory page metadata to a sequence ID included within the footer information, and
examining a checksum included within the memory page metadata to determine if the memory page metadata was corrupted during the power failure event, wherein the checksum is a checksum of the header information and the payload,
wherein a bad checksum in combination with a mismatch between the sequence ID included within the header information and the sequence ID included within the footer information indicates a write split due to the power failure event, and
wherein a bad checksum in combination with the sequence IDs in both the header information and the footer information being either invalid or matched indicates data corruption during the power failure event;
in response to the sequence IDs in both the header information and the footer information being invalid, initiating a data recovery process to attempt to recover content associated with data corruption, wherein the data recovery process includes a File System Consistency Check (FSCK); and
in response to a bad checksum in combination with a mismatch between the sequence ID included within the header information and the sequence ID included within the footer information, reobtaining content associated with pre-acknowledgement data corruption.
6. The computer program product of claim 5 wherein reobtaining content associated with the pre-acknowledgement data corruption includes:
deleting the memory page metadata that includes the pre-acknowledgement data corruption; and
deleting content currently associated with the pre-acknowledgement data corruption.
7. The computer program product of claim 6 wherein reobtaining content associated with the pre-acknowledgement data corruption further includes:
obtaining replacement content associated with the pre-acknowledgement data corruption from a client; and
generating replacement memory page metadata for the replacement content.
8. The computer program product of claim 7 wherein reobtaining content associated with the pre-acknowledgement data corruption further includes:
storing the replacement content and the replacement memory page metadata on the cache memory system.
9. A computing system including a processor and memory configured to perform operations comprising:
processing memory page metadata received from a cache memory system within a data storage system to determine if the memory page metadata includes corruption due to a power failure event, wherein the memory page metadata identifies a location of a memory page within the cache memory system and includes header information, a payload, and footer information, wherein processing memory page metadata received from a cache memory system within a data storage system to determine if the memory page metadata includes corruption due to a power failure event includes:
comparing a sequence ID included within the header information of the memory page metadata to a sequence ID included within the footer information, and
examining a checksum included within the memory page metadata to determine if the memory page metadata was corrupted during the power failure event, wherein the checksum is a checksum of the header information and the payload,
wherein a bad checksum in combination with a mismatch between the sequence ID included within the header information and the sequence ID included within the footer information indicates a write split due to the power failure event, and
wherein a bad checksum in combination with the sequence IDs in both the header information and the footer information being either invalid or matched indicates data corruption during the power failure event;
in response to the sequence IDs in both the header information and the footer information being invalid, initiating a data recovery process to attempt to recover content associated with data corruption, wherein the data recovery process includes a File System Consistency Check (FSCK); and
in response to a bad checksum in combination with a mismatch between the sequence ID included within the header information and the sequence ID included within the footer information, reobtaining content associated with pre-acknowledgement data corruption.
10. The computing system of claim 9 wherein reobtaining content associated with the pre-acknowledgement data corruption includes:
deleting the memory page metadata that includes the pre-acknowledgement data corruption; and
deleting content currently associated with the pre-acknowledgement data corruption.
11. The computing system of claim 10 wherein reobtaining content associated with the pre-acknowledgement data corruption further includes:
obtaining replacement content associated with the pre-acknowledgement data corruption from a client; and
generating replacement memory page metadata for the replacement content.
12. The computing system of claim 11 wherein reobtaining content associated with the pre-acknowledgement data corruption further includes:
storing the replacement content and the replacement memory page metadata on the cache memory system.
13. The computer-implemented method of claim 1 , wherein the payload includes client-specific information.