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Performance Monitoring Guide

OceanStor Dorado V3 Series V300R002

This document describes performance monitoring of storage systems, including the monitoring method, indicator planning, configuration monitoring, and problem diagnosis.
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Checking the Performance Impacts of Internal Transactions and Value-Added Features

Checking the Performance Impacts of Internal Transactions and Value-Added Features

Internal transactions refer to the work completed in the background in response to user operations, for example, reconstructing data upon a disk failure, data balancing upon capacity expansion, and global garbage collection. In addition to numerous metadata operations, internal transactions and value-added features may generate a large number of non-host I/Os. Therefore, host services processed by the storage system are affected.

Before diagnosing a performance problem, check whether there are internal transactions or value-added features. Examples of these are as follows:

  • Precopy and reconstruction
    • Precopy: The precopy technique enables the storage system to regularly check the status of hardware. If a disk may fail, the storage system will migrate the data from the disk to mitigate data loss.
    • Reconstruction: If a disk fails, the reconstruction function restores data to a newly allocated hot spare space based on a RAID redundancy mechanism, leading to a large amount of RAID computing and data copying.
      admin:/>show disk_domain task disk_domain_id=0 
      Disk Domain ID : 0 
      Type : Reconstruct 
      Disk Enclosure : DAE101 
      Disk Slot : 23 
      Data Size : 17.625GB 
      Data Finished Size : 1.375GB 
      Remain Time : 0Day(s) 1Hour(s) 26Minute(s) 4Second(s) 
      Progress : 7%

If disk domains are already engaged in precopy or reconstruction, their progress can be viewed. However, if these tasks are not currently engaged, a message is displayed indicating that the command is successfully executed.

  • Migration

    SmartMigration supports LUN migration within or between storage devices. Migration involves a large number of data read, write, and copy operations, leading to performance deterioration. A migration speed can be specified. A higher speed has a greater impact on host I/Os.

  • Other value-added features

    Value-added features such as snapshot and remote replication cause extra overheads and prolong the I/O processing. For details about the impact of value-added features on host performance, see the corresponding feature guide.

Updated: 2019-07-17

Document ID: EDOC1100049152

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