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SmartTier Feature Guide for Block

OceanStor V5 Series V500R007

This document is applicable to OceanStor 5110 V5, 5300 V5, 5500 V5, 5600 V5, 5800 V5, 6800 V5, 18500 V5, and 18800 V5. This document describes the working principle and application scenarios of the SmartTier (for block) feature. It also explains how to configure and manage the feature.
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Configuring a Data Migration Speed

Configuring a Data Migration Speed

A data migration speed controls the rate at which data is relocated among storage tiers. No matter which rate is selected, SmartTier dynamically adjusts the actual rate based on the current service workload within the maximum rate limitation to minimize the impact on the current service.


The object of this parameter is all storage pools. The possible parameter values are High, Medium, and Low. The default value is Medium. This parameter value can be changed after being set.

  • When Data Migration Speed is set to High, SmartTier tries to relocate maximum data within a minimum period. The data relocation process causes a back-end overhead, which may increase the I/O response time. A larger amount of data relocated causes a longer response time. Generally, data relocation among storage tiers can be completed within the minimum period.
  • When Data Migration Speed is set to Low, I/O response time will remain the same, but data relocation will take a longer time.

Figure 2-2 displays the comparison between I/O response times when Data Migration Speed is set to High, Medium, and Low. The storage pool workloads and the amount of data relocated are assumed to remain unchanged.

Figure 2-2 I/O response times at different data migration speed


A storage pool configured with SmartTier needs to reserve free space because SmartTier requires extra data exchange space to dynamically relocate data.


  1. Go to the SmartTier management page.

    1. On the right navigation bar of DeviceManager, click .

      The Provisioning page is displayed.

    2. Click Resource Performance Tuning.

      The Resource Performance Tuning page is displayed.

    3. Click SmartTier.

      The SmartTier management page is displayed.

  2. Set a data migration speed.

    On the SmartTier page, set Data Migration Speed.

    • Set Data Migration Speed to Low for migration during peak hours.
    • Set Data Migration Speed to Medium or High for migration during off-peak hours.

    The Data Migration Speed of a single controller varies between values:

    • Low: Data migration speed is 0 to 10 MB/s.
    • Medium: Data migration speed is 0 to 20 MB/s.
    • High: Data migration speed is 0 to 100 MB/s.

Updated: 2019-07-11

Document ID: EDOC1000181474

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