Managing accesses to storage

Active Publication Date: 2017-05-23
EMC IP HLDG CO LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Examples of physical constraints include bus occupancy and availability, excessive disk arm movement, and uneven distribution of load across disks or across RAID groups.
One factor that can limit the performance of a storage system is the performance of each individual storage device.
Furthermore, even if a disk-based storage system uses the fastest disks available, the performance of the storage system can be limited by the number of those disks that can be accessed at a time.
In other words, performance of a storage system, whether it is an array of disks, tapes, flash drives, or other storage devices, can also be limited by system constraints, such the number of data transfer buses available in the system and the density of traffic on each bus.

Method used

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  • Managing accesses to storage
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Example

[0017]Described below is a technique for use in managing accesses to storage. In at least one implementation, the technique may be used to help provide, among other things, a method for approximating the number of data drives in a thinly provisioned logical volume (LUN).

[0018]For example, a host side (also referred to as front end) software component on a storage array may use a fairness process to limit the number of requests to a LUN based on the number of physical data drives on the back end that provide backing storage for the LUN. This fairness process helps to prevent any one host initiator from overwhelming the back end of a storage array.

[0019]For a traditional (not thinly provisioned) LUN, the fairness process can rely simply on a mapping to the underlying RAID group for the LUN, which RAID group has a static number of drives.

[0020]By contrast, in an enhancement as described herein, a mapped LUN driver (MLU) presents to a host a virtual volume such as a thinly provisioned LUN

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Abstract

A method is used in managing accesses to storage. An amount of data storage space in use by a mapped logical volume and RAID group characteristics of a storage pool used by the mapped logical volume are determined. Based on the amount and the RAID group characteristics, a report of storage resources corresponding to the mapped logical volume is produced. Based on the report, accesses to the mapped logical volume are controlled.

Description

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Claims

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Application Information

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Owner EMC IP HLDG CO LLC
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