{"id":283,"date":"2025-10-10T11:15:30","date_gmt":"2025-10-10T11:15:30","guid":{"rendered":"https:\/\/raidzfscalculator.com\/?page_id=283"},"modified":"2025-11-30T19:12:20","modified_gmt":"2025-11-30T19:12:20","slug":"rebuild-time-calculator","status":"publish","type":"page","link":"https:\/\/raidzfscalculator.com\/en\/rebuild-time-calculator\/","title":{"rendered":"Rebuild time calculator"},"content":{"rendered":"\n[et_pb_section fb_built=”1″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_row column_structure=”1_2,1_2″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}” theme_builder_area=”post_content”][et_pb_column type=”1_2″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}” theme_builder_area=”post_content”][et_pb_blurb url=”https:\/\/raidzfscalculator.com\/” image=”https:\/\/www.raidzfscalculator.com\/en\/wp-content\/uploads\/2025\/11\/icons8-la-france-48.png” alt=”RAID ZFS CALCULATOR FIO RESULT VIEWER” _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}” theme_builder_area=”post_content”]

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Rebuild time calculator<\/h1>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”]

Rebuild Time Calculator: Control the Risk of RAID Double Failure<\/h2>\n

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The moment a RAID disk fails is critical. The time it takes to rebuild onto a new spare disk is the most dangerous period for your data. If a second disk fails during this phase, data loss is guaranteed (except in RAID 6\/Z2).<\/p>\n

Our Reconstruction Time Calculator gives you a critical estimate in hours and minutes, allowing you to plan for risk windows and ensure the reliability of your infrastructure.<\/p>\n

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Why is Rebuild Time Crucial?<\/h3>\n

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  • Vulnerability Window (MTTR): The longer the rebuild takes, the higher the probability of a second failure (known as a “double failure”). This tool quantifies this risk.<\/li>\n
  • Disk Performance: Rebuild speed is limited by the sequential read throughput of the smaller capacity disk and not by the theoretical speed of the controller.<\/li>\n
  • Planning: Determine if you need faster spare drives (Hot Spares SSD or Fast Cold Spares HDD) to reduce this risk window.<\/li>\n<\/ul>\n

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    How does the calculation work?<\/h3>\n

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    The calculation is simple yet powerful: it divides the capacity of the failed disk (in GB) by the effective read speed (in MB\/s) of the other disks, applying a load factor to simulate system slowdown during the operation.<\/p>\n

    Enter your disk size, RAID level (for context), and your hardware’s read speed to get an accurate, quantifiable estimate. Plan for resilience, not failure.<\/p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_code _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”]