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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 SmartTier Policy

Configuring a SmartTier Policy

A SmartTier policy specifies the direction in which data is relocated. Set or adjust the data relocation policy based on LUNs' performance requirements and service environments.

Context

Set the SmartTier policy when you are creating a LUN or when the SmartTier is in use. The object of this parameter is a single LUN in a storage pool. This parameter value can be changed. Table 2-2 lists the data relocation policies.

Table 2-2 Data relocation policies

Relocation Policy

Description

Application Scenario

No relocation

The no relocation policy does not relocate data blocks among storage tiers, and data can be relocated only when the SmartTier policy is changed.

The no relocation policy is the default policy set upon the creation of a LUN.

Automatic relocation

It relocates data based on the hotness (access frequency) ranking order of data blocks.

NOTE:

You must enable I/O monitoring for the configured automatic relocation policy to take effect.

Service data experiences busy and idle periods, and hot and cold data coexists. To improve system overall performance, frequently-accessed data needs to be stored at the higher performance tier.

Highest relocation

This policy preferentially promotes data blocks to the high-performance tier and the performance tier.

NOTE:

If this policy is configured and the amount of relocated data is large, the highest tier may be fully occupied and data cannot be relocated into or from the tier.

The highest available policy is recommended for the applications (such as OLTP databases) sensitive to response time, IOPS, and bandwidth.

Lowest relocation

This policy preferentially demotes data blocks to the performance tier and the capacity tier, regardless of the activity levels of these data blocks.

NOTE:

If this policy is configured and the amount of relocated data is large, the lowest tier may be fully occupied and data cannot be relocated into or from the tier.

The lowest available policy is recommended for applications (such as file sharing) insensitive to performance requirements and whose data is not accessed frequently.

NOTE:
  • The default policy is No relocation. You are advised to set or adjust the SmartTier policy based on LUNs' performance requirements, and take the initial capacity allocation policy into consideration to set an optimal SmartTier policy.
  • A storage pool may have multiple LUNs with different SmartTier policies. However, the I/O monitoring function is effective to the entire storage pool. Therefore, enable I/O monitoring to ensure that migration tasks are complete for LUNs with automatic relocation policy.

Procedure

  1. Go to the Storage Pool page.

    1. On the right navigation bar, click .

      The Provisioning page is displayed.

    2. On the page, click Storage Pool.

      The Storage Pool management page is displayed.

  2. Configure a SmartTier policy.

    1. On the Storage Pool management page, select a storage pool. In the LUN area, all LUNs in the storage pool are displayed.
    2. Select the LUN for which you want to configure a data relocation policy and click Properties.

      The LUN properties page is displayed.

    3. On the SmartTier tab page, set a data relocation policy for the LUN.
    4. Click OK.

      The data relocation policy is configured.

    NOTE:

    On the resource allocation management page, click LUN. All LUNs existing in the storage system are displayed. Right-click the LUN for which you want to set a data relocation policy and choose Properties from the shortcut menu. On the LUN Properties page that is displayed, set a data relocation policy for the LUN.

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Updated: 2019-07-11

Document ID: EDOC1000181474

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