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data-path="/UserGuide/V1.2.x/User-Manual/Tiered-Storage_timecho.html" data-page-key="/UserGuide/V1.2.x/User-Manual/Tiered-Storage_timecho.html">...</span></span><span class="page-reading-time-info" aria-label="Reading Time"><svg xmlns="http://www.w3.org/2000/svg" class="icon timer-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="timer icon"><path d="M799.387 122.15c4.402-2.978 7.38-7.897 7.38-13.463v-1.165c0-8.933-7.38-16.312-16.312-16.312H256.33c-8.933 0-16.311 7.38-16.311 16.312v1.165c0 5.825 2.977 10.874 7.637 13.592 4.143 194.44 97.22 354.963 220.201 392.763-122.204 37.542-214.893 196.511-220.2 389.397-4.661 5.049-7.638 11.651-7.638 19.03v5.825h566.49v-5.825c0-7.379-2.849-13.981-7.509-18.9-5.049-193.016-97.867-351.985-220.2-389.527 123.24-37.67 216.446-198.453 220.588-392.892zM531.16 450.445v352.632c117.674 1.553 211.787 40.778 211.787 88.676H304.097c0-48.286 95.149-87.382 213.728-88.676V450.445c-93.077-3.107-167.901-81.297-167.901-177.093 0-8.803 6.99-15.793 15.793-15.793 8.803 0 15.794 6.99 15.794 15.793 0 80.261 63.69 145.635 142.01 145.635s142.011-65.374 142.011-145.635c0-8.803 6.99-15.793 15.794-15.793s15.793 6.99 15.793 15.793c0 95.019-73.789 172.82-165.96 177.093z"></path></svg><span>About 3 min</span><meta property="timeRequired" content="PT3M"></span><!----><!----></div><hr></div><div class="vp-toc-placeholder"><aside id="toc"><!--[--><!----><!--]--><div class="vp-toc-header">On This Page<button type="button" class="print-button" title="Print"><svg xmlns="http://www.w3.org/2000/svg" class="icon print-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="print icon"><path d="M819.2 364.8h-44.8V128c0-17.067-14.933-32-32-32H281.6c-17.067 0-32 14.933-32 32v236.8h-44.8C145.067 364.8 96 413.867 96 473.6v192c0 59.733 49.067 108.8 108.8 108.8h44.8V896c0 17.067 14.933 32 32 32h460.8c17.067 0 32-14.933 32-32V774.4h44.8c59.733 0 108.8-49.067 108.8-108.8v-192c0-59.733-49.067-108.8-108.8-108.8zM313.6 160h396.8v204.8H313.6V160zm396.8 704H313.6V620.8h396.8V864zM864 665.6c0 25.6-19.2 44.8-44.8 44.8h-44.8V588.8c0-17.067-14.933-32-32-32H281.6c-17.067 0-32 14.933-32 32v121.6h-44.8c-25.6 0-44.8-19.2-44.8-44.8v-192c0-25.6 19.2-44.8 44.8-44.8h614.4c25.6 0 44.8 19.2 44.8 44.8v192z"></path></svg></button><div class="arrow end"></div></div><div class="vp-toc-wrapper"><ul class="vp-toc-list"><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level2" href="#overview">Overview</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level2" href="#parameter-definition">Parameter Definition</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level2" href="#local-tiered-storag-configuration-example">local tiered storag configuration example</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level2" href="#remote-tiered-storag-configuration-example">remote tiered storag configuration example</a></li><!----><!--]--></ul><div class="vp-toc-marker" style="top:-1.7rem;"></div></div><!--[--><!----><!--]--></aside></div><!--[--><!----><!--]--><div class="theme-hope-content"><h1 id="tiered-storage" tabindex="-1"><a class="header-anchor" href="#tiered-storage"><span>Tiered Storage</span></a></h1><h2 id="overview" tabindex="-1"><a class="header-anchor" href="#overview"><span>Overview</span></a></h2><p>The Tiered storage functionality allows users to define multiple layers of storage, spanning across multiple types of storage media (Memory mapped directory, SSD, rotational hard discs or cloud storage). While memory and cloud storage is usually singular, the local file system storages can consist of multiple directories joined together into one tier. Meanwhile, users can classify data based on its hot or cold nature and store data of different categories in specified "tier". Currently, IoTDB supports the classification of hot and cold data through TTL (Time to live / age) of data. When the data in one tier does not meet the TTL rules defined in the current tier, the data will be automatically migrated to the next tier.</p><h2 id="parameter-definition" tabindex="-1"><a class="header-anchor" href="#parameter-definition"><span>Parameter Definition</span></a></h2><p>To enable tiered storage in IoTDB, you need to configure the following aspects:</p><ol><li>configure the data catalogue and divide the data catalogue into different tiers</li><li>configure the TTL of the data managed in each tier to distinguish between hot and cold data categories managed in different tiers.</li><li>configure the minimum remaining storage space ratio for each tier so that when the storage space of the tier triggers the threshold, the data of the tier will be automatically migrated to the next tier (optional).</li></ol><p>The specific parameter definitions and their descriptions are as follows.</p><table><thead><tr><th>Configuration</th><th>Default</th><th>Description</th><th>Constraint</th></tr></thead><tbody><tr><td>dn_data_dirs</td><td>None</td><td>specify different storage directories and divide the storage directories into tiers</td><td>Each level of storage uses a semicolon to separate, and commas to separate within a single level; cloud (OBJECT_STORAGE) configuration can only be used as the last level of storage and the first level can't be used as cloud storage; a cloud object at most; the remote storage directory is denoted by OBJECT_STORAGE</td></tr><tr><td>default_ttl_in_ms</td><td>None</td><td>Define the maximum age of data for which each tier is responsible</td><td>Each level of storage is separated by a semicolon; the number of levels should match the number of levels defined by dn_data_dirs</td></tr><tr><td>dn_default_space_move_thresholds</td><td>0.15</td><td>Define the minimum remaining space ratio for each tier data catalogue; when the remaining space is less than this ratio, the data will be automatically migrated to the next tier; when the remaining storage space of the last tier falls below this threshold, the system will be set to READ_ONLY</td><td>Each level of storage is separated by a semicolon; the number of levels should match the number of levels defined by dn_data_dirs</td></tr><tr><td>object_storage_type</td><td>AWS_S3</td><td>Cloud Storage Type</td><td>IoTDB currently only supports AWS S3 as a remote storage type, and this parameter can't be modified</td></tr><tr><td>object_storage_bucket</td><td>None</td><td>Name of cloud storage bucket</td><td>Bucket definition in AWS S3; no need to configure if remote storage is not used</td></tr><tr><td>object_storage_endpoiont</td><td></td><td>endpoint of cloud storage</td><td>endpoint of AWS S3；If remote storage is not used, no configuration required</td></tr><tr><td>object_storage_access_key</td><td></td><td>Authentication information stored in the cloud: key</td><td>AWS S3 credential key；If remote storage is not used, no configuration required</td></tr><tr><td>object_storage_access_secret</td><td></td><td>Authentication information stored in the cloud: secret</td><td>AWS S3 credential secret；If remote storage is not used, no configuration required</td></tr><tr><td>remote_tsfile_cache_dirs</td><td>data/datanode/data/cache</td><td>Cache directory stored locally in the cloud</td><td>If remote storage is not used, no configuration required</td></tr><tr><td>remote_tsfile_cache_page_size_in_kb</td><td>20480</td><td>Block size of locally cached files stored in the cloud</td><td>If remote storage is not used, no configuration required</td></tr><tr><td>remote_tsfile_cache_max_disk_usage_in_mb</td><td>51200</td><td>Maximum Disk Occupancy Size for Cloud Storage Local Cache</td><td>If remote storage is not used, no configuration required</td></tr></tbody></table><h2 id="local-tiered-storag-configuration-example" tabindex="-1"><a class="header-anchor" href="#local-tiered-storag-configuration-example"><span>local tiered storag configuration example</span></a></h2><p>The following is an example of a local two-level storage configuration.</p><div class="language-JavaScript line-numbers-mode" data-ext="JavaScript" data-title="JavaScript"><pre class="language-JavaScript"><code>//Required configuration items |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p>In this example, a total of three levels of storage are configured, specifically:</p><table><thead><tr><th><strong>tier</strong></th><th><strong>data path</strong></th><th><strong>data range</strong></th><th><strong>threshold for minimum remaining disk space</strong></th></tr></thead><tbody><tr><td>tier1</td><td>path 1：/data1/data</td><td>data for last 1 day</td><td>20%</td></tr><tr><td>tier2</td><td>path 1：/data2/data path 2：/data3/data</td><td>data from past 1 day to past 10 days</td><td>15%</td></tr><tr><td>tier3</td><td>Remote AWS S3 Storage</td><td>data from 1 day ago</td><td>10%</td></tr></tbody></table></div><!--[--><!----><!--]--><footer class="vp-page-meta"><div class="vp-meta-item edit-link"><a href="https://github.com/apache/iotdb-docs/edit/main/src/UserGuide/V1.2.x/User-Manual/Tiered-Storage_timecho.md" rel="noopener noreferrer" target="_blank" aria-label="Found Error? Edit this page on GitHub" class="nav-link vp-meta-label"><!--[--><svg xmlns="http://www.w3.org/2000/svg" class="icon edit-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="edit icon"><path d="M430.818 653.65a60.46 60.46 0 0 1-50.96-93.281l71.69-114.012 7.773-10.365L816.038 80.138A60.46 60.46 0 0 1 859.225 62a60.46 60.46 0 0 1 43.186 18.138l43.186 43.186a60.46 60.46 0 0 1 0 86.373L588.879 565.55l-8.637 8.637-117.466 68.234a60.46 60.46 0 0 1-31.958 11.229z"></path><path d="M728.802 962H252.891A190.883 190.883 0 0 1 62.008 771.98V296.934a190.883 190.883 0 0 1 190.883-192.61h267.754a60.46 60.46 0 0 1 0 120.92H252.891a69.962 69.962 0 0 0-69.098 69.099V771.98a69.962 69.962 0 0 0 69.098 69.098h475.911A69.962 69.962 0 0 0 797.9 771.98V503.363a60.46 60.46 0 1 1 120.922 0V771.98A190.883 190.883 0 0 1 728.802 962z"></path></svg><!--]-->Found Error? Edit this page on GitHub<span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">open in new window</span></span><!----></a></div><div class="vp-meta-item git-info"><div class="update-time"><span class="vp-meta-label">Last update: </span><!----></div><!----></div></footer><!----><!----><!--[--><!----><!--]--><!--]--></main><!--]--><footer style="padding-bottom:2rem;"><span id="doc-version" style="display:none;">rel/1.2</span><p style="text-align:center;color:#909399;font-size:12px;margin:0 30px;">Copyright © 2024 The Apache Software Foundation.<br> Apache and the Apache feather logo are trademarks of The Apache Software Foundation</p><p style="text-align:center;margin-top:10px;color:#909399;font-size:12px;margin:0 30px;"><strong>Have a question?</strong> Connect with us on QQ, WeChat, or Slack. <a href="https://github.com/apache/iotdb/issues/1995">Join the community</a> now.</p></footer></div><!--]--><!--]--><!--[--><!----><!--]--><!--]--></div> |
