Cache Slot Allocation by Write Duration Estimation
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Solution Overview
Problem
Storage systems face inefficiencies in cache slot allocation, leading to reduced throughput due to uneven utilization of cache resources, as write operations are not optimally routed based on the expected time to write data to disk, resulting in congestion and delayed higher-priority data processing.
Innovation Solution
A method that collects operational information on storage media tiers, devices, and logical storage layers to estimate the time required for write and read operations, allowing for intelligent cache slot allocation by assigning faster cache slots to operations expected to clear quickly and slower cache slots to those expected to take longer, thereby optimizing cache resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cache slots are allocated without considering write operation timing characteristics, then cache resource utilization becomes uneven, but throughput is reduced due to congestion and delayed processing
Solution Approach 1:
The system performs preliminary estimation of write operation duration before cache slot allocation. By collecting operational information about storage media tiers, devices, and logical storage layers in advance, the system can predict which write operations will complete quickly and which will take longer, allowing optimal cache slot selection before the actual write operation begins.
Solution Approach 2:
The patent applies different cache slot allocation strategies based on the specific characteristics of each write operation. Fast-write operations are directed to higher-performance cache slots, while slow-write operations are directed to lower-performance cache slots. This localized optimization ensures that each cache slot is used by operations appropriate to its performance characteristics.
2Speed
If faster cache slots are used for all write operations, then data processing speed is improved, but cache slot availability and reuse rate decrease due to prolonged occupancy
Solution Approach 1:
The system assigns different cache slot types to different write operations based on their expected duration. Short-duration write operations are assigned to fast cache slots to maximize speed, while long-duration write operations are assigned to slow cache slots to preserve fast cache slot availability. This localized matching optimizes both speed and resource availability.
Solution Approach 2:
The system changes the parameter of cache slot selection based on the estimated write operation duration. By dynamically adjusting which cache slot type is assigned to which operation based on operational characteristics and timing estimates, the system optimizes the balance between processing speed and cache slot reuse rate.
3Productivity
If cache slot allocation is based on operational timing estimates, then resource utilization is optimized, but system complexity increases due to information collection and estimation processes
Solution Approach 1:
The operational information collection mechanism serves multiple functions: it characterizes storage media performance, estimates write operation duration, and provides input for cache slot allocation decisions. By making this information collection process universal and multi-functional, the patent reduces the need for separate specialized systems while achieving optimized cache utilization.
Data Source
AI summary
Operational information in a storage system is collected regarding storage media storage tiers, devices, drives, tracks on drives, and logical storage layers, to determine an estimated amount of time it will take to write data from cache to the intended drive when a new write operation arrives at the storage system. This information is then used to decide which type of cache is most optimal to store the data for the write operation, based on the estimated amount of time it will take to write data out from the cache. By allocating cache slots from a faster cache to write operations that are expected to quickly be written out to memory, and allocating cache slots from the slower cache to write operations that are expected to take more time to be written out to memory, it is possible to increase the availability of the cache slots in the faster cache.