Extent level cache destaging
View Patent ↗A System, Computer Program Product, and Computer-executable method for managing cache de-staging on a data storage system wherein the data storage system provides a Logical Unit (LU), the System, Computer Program Product, and Computer-executable method including dividing the LU into two or more extents, analyzing each of the two or more extents, creating a cache de-staging policy based on the analysis, and managing cache de-staging of the LU based the cache de-staging policy.
1. A Computer-executable method for managing cache de-staging on a data storage system wherein the data storage system provides a Logical Unit (LU), the computer-executable method comprising:
dividing, by the data storage system, the LU into two or more extents;
at the data storage system, analyzing each of the two or more extents;
creating, via the data storage system, a cache de-staging policy based on the analysis; and
managing, at the data storage system, cache de-staging of the LU based the cache de-staging policy;
wherein the analyzing comprises determining a probability or amount of write folding for each of the two or more extents
wherein managing comprises:
ordering each of the extents based on the amount or probability of write folding for each of the extents; and
retaining data within cache for a first extent of the extents, wherein the first extent has a high amount or probability of write folding.
2. The computer-executable method of claim 1 , wherein the cache de-staging policy is targeted towards a flash data storage array.
3. The computer-executable method of claim 1 , wherein the cache de-staging policy is targeted towards a rotational disk based data storage array.
4. The computer-executable method of claim 1 , wherein the analyzing comprises determining a probability for each of the extents, wherein the probability is a probability that data is sequentially written to the extent.
5. The computer-executable method of claim 4 , wherein managing comprises:
ordering each of the extents based on the probability of sequentially for each of the extents;
de-staging extent with high probability for sequential IO when there is a large enough sequential portion of data.
6. A system, comprising:
a data storage system, wherein the data storage system is enabled to provide a Logical Unit (LU); and
computer-executable program logic encoded in memory of one or more computers enabled to manage cache de-staging on the data storage system, wherein the computer-executable program logic is configured for the execution of:
dividing, by the data storage system, the LU into two or more extents;
at the data storage system, analyzing each of the two or more extents;
creating, via the data storage system, a cache de-staging policy based on the analysis; and
managing, at the data storage system, cache de-staging of the LU based the cache de-staging policy;
wherein the analyzing comprises determining a probability or amount of write folding for each of the two or more extents
wherein managing comprises:
ordering each of the extents based on the amount or probability of write folding for each of the extents; and
retaining data within cache for a first extent of the extents, wherein the first extent has a high amount or probability of write folding.
7. The System of claim 6 , wherein the cache de-staging policy is targeted towards a flash data storage array.
8. The System of claim 6 , wherein the cache de-staging policy is targeted towards a rotational disk based data storage array.
9. The System of claim 6 , wherein the analyzing comprises determining a probability for each of the extents, wherein the probability is a probability that data is sequentially written to the extent.
10. The System of claim 9 , wherein managing comprises:
ordering each of the extents based on the probability of sequentially for each of the extents;
de-staging extent with high probability for sequential IO when there is a large enough sequential portion of data.
11. A Computer program product for managing cache de-staging on a data storage system wherein the data storage system provides a Logical Unit (LU), the computer-executable method comprising:
a non-transitory computer readable medium encoded with computer-executable code, the code configured to enable the execution of:
dividing, by the data storage system, the LU into two or more extents;
at the data storage system, analyzing each of the two or more extents;
creating, via the data storage system, a cache de-staging policy based on the analysis; and
managing, at the data storage system, cache de-staging of the LU based the cache de-staging policy;
wherein the analyzing comprises determining a probability or amount of write folding for each of the two or more extents
wherein managing comprises:
ordering each of the extents based on the amount or probability of write folding for each of the extents; and
retaining data within cache for a first extent of the extents, wherein the first extent has a high amount or probability of write folding.
12. The Computer program product of claim 11 , wherein the cache de-staging policy is targeted towards a flash data storage array.
13. The Computer program product of claim 11 , wherein the cache de-staging policy is targeted towards a rotational disk based data storage array.
14. The Computer program product of claim 11 , wherein the analyzing comprises determining a probability for each of the extents, wherein the probability is a probability that data is sequentially written to the extent.