Shifting wearout of storage disks
First Claim
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1. A method for shifting wearout of storage disks in an array of storage disks in a storage system, the method comprising:
- generating a schedule to stagger wearout of the each storage disk in the array of storage disks at different times based on a mean time to failure (MTTF) of the storage disks in the array by;
determining a parity to write ratio of a parity to data according to a number of the storage disks,calculating an average writes per week to reach a maximum write of at least one of the storage disks,calculating a first write ratio for the at least one of the storage disks to reach the wearout an order of deviation earlier than the MTTF for the at least one of the storage disks, andcalculating a second write ratio for the at least one of the storage disks to reach wearout an order of deviation past the MTTF for the at least one of the storage disks;
associating, by the controller, with each storage disk in the array a corresponding predetermined offset for wearout with respect to the MTTF to schedule wearout of each storage disk at the corresponding predetermined offset from the MTTF, each corresponding predetermined offset being different for the each storage disk and based on the schedule to stagger the wearout of the storage disks at different times;
determining, by the controller, a write ratio for each storage disk in the array, the write ratio indicative of a number of writes to cause the storage disks to wearout according to the corresponding predetermined offsets of the respective storage disks; and
staggering, by the controller and based at least in part on the schedule to stagger, a number of writes to the storage disks so that the storage disk wears out at the different times according to the each corresponding predetermined offset of the storage disks, the staggering comprising;
generating, by the controller, checksum data corresponding to the data;
dividing, by the controller, the checksum data into a plurality of portions, a portion for each storage disk in the array, and each portion of, a different size, wherein the sizes of the portions of the checksum data are based on the write ratios for each storage disk; and
writing, by the controller, each portion of the checksum data onto a respective storage disk in the array.
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Abstract
Technical solutions are described that shift wearout of an array of storage disks in a storage system. In an aspect, a method includes receiving a request to write data to the storage system. The method also includes generating checksum data corresponding to the data and dividing the checksum data into portions of distinct sizes. The method also includes writing each portion of the checksum data onto a respective storage disk in the array.
34 Citations
8 Claims
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1. A method for shifting wearout of storage disks in an array of storage disks in a storage system, the method comprising:
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generating a schedule to stagger wearout of the each storage disk in the array of storage disks at different times based on a mean time to failure (MTTF) of the storage disks in the array by; determining a parity to write ratio of a parity to data according to a number of the storage disks, calculating an average writes per week to reach a maximum write of at least one of the storage disks, calculating a first write ratio for the at least one of the storage disks to reach the wearout an order of deviation earlier than the MTTF for the at least one of the storage disks, and calculating a second write ratio for the at least one of the storage disks to reach wearout an order of deviation past the MTTF for the at least one of the storage disks; associating, by the controller, with each storage disk in the array a corresponding predetermined offset for wearout with respect to the MTTF to schedule wearout of each storage disk at the corresponding predetermined offset from the MTTF, each corresponding predetermined offset being different for the each storage disk and based on the schedule to stagger the wearout of the storage disks at different times; determining, by the controller, a write ratio for each storage disk in the array, the write ratio indicative of a number of writes to cause the storage disks to wearout according to the corresponding predetermined offsets of the respective storage disks; and staggering, by the controller and based at least in part on the schedule to stagger, a number of writes to the storage disks so that the storage disk wears out at the different times according to the each corresponding predetermined offset of the storage disks, the staggering comprising; generating, by the controller, checksum data corresponding to the data; dividing, by the controller, the checksum data into a plurality of portions, a portion for each storage disk in the array, and each portion of, a different size, wherein the sizes of the portions of the checksum data are based on the write ratios for each storage disk; and writing, by the controller, each portion of the checksum data onto a respective storage disk in the array. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification