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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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Setting a Data Migration Plan

Setting a Data Migration Plan

A data migration plan specifies the mode in which data is relocated. You can adjust the data migration mode based on service requirements.

Context

You can set the relocation triggering mode when you are creating a storage pool and want to use the SmartTier to manage storage. This parameter can be changed and its object is a specific storage pool.

NOTE:

When SSD cache is enabled, users cannot set Data Migration Plan.

The possible values are Manual and Periodical. The default value is Manual.

  • Manual

    The manual mode is required when a storage pool needs to be reconfigured (after being added with a new tier for example), or hot data is constantly changing and evenly placed on all tiers. After a manual relocation task is initiated, the SmartTier begins the data placement analysis according to the current I/O monitoring data and determines the direction for data relocation based on the analysis result.

  • Periodical

    If you want to use the automatic mode, schedule the times for data relocation in advance.

In either manual or automatic mode, the SmartTier data relocation is regarded as a low-priority task and is executed in the storage system background.

During the data relocation period, the relocation task will automatically restart under the following circumstances, even if it has already been completed:

  • Add a new tier to the storage pool.
  • Modify the SmartTier policy of the LUNs.

The best practice is to initiate data relocation during the off-peak hours such as 01:00 a.m. to 05:00 a.m.

Assume that after a data placement analysis is complete, the storage system starts data relocation (manual or automatic) from 01:00 a.m. to 05:00 a.m., and during this process, the second data placement analysis begins at 02:00 a.m. as scheduled (once every hour). Even if at 02:00 a.m., the data relocation caused by the first data placement analysis (at 01:00) has not been completed, the SmartTier ranks the unallocated data blocks with other data blocks, and then resumes the data relocation based on the updated rank ordering.

Precautions

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

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. Set a data migration plan.

    1. On the storage pool management page, select the storage pool for which you want to set a data migration plan and click Properties. The Properties of Storage Pool dialog box is displayed.
    2. In the Properties of Storage Pool dialog box, click the SmartTier Policy tab.
    3. In the Data Migration Plan area, set the data migration triggering mode to Manual or Periodical. In Periodical, you need to set the period for enabling data migration.
    4. Click OK. The data migration plan is successfully configured.

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Updated: 2019-07-11

Document ID: EDOC1000181474

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