Raidz pool size incorrectly estimated during creation
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- 25 Aug 2023, 04:54 AM
- 25 Aug 2023, 04:54 AM
- 25 Aug 2023, 04:54 AM
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iX-Tony September 8, 2023 at 8:55 PM
Timed out waiting for additional information from ticket reporter.
Automation for Jira August 25, 2023 at 5:04 AM
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https://ixsystems.atlassian.net/servicedesk/customer/portal/15/group/37/create/153
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moooV
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Time trackingKatalon Platform
Linked Test Cases, Katalon Defect Results, Katalon Studio Test Results
Katalon Platform
Linked Test Cases, Katalon Defect Results, Katalon Studio Test Results
Created August 25, 2023 at 5:04 AM
Updated February 27, 2025 at 9:16 PM
Resolved September 8, 2023 at 8:55 PM
Hello!
Pool size estimation is not taking additional ZFS capacity overhead into account on raidz creation. I’ve spent a lot of time figuring out what’s going on using different storage capacity calculators online.
I have 12 disks of 14Tb - which are 12 x 12.73TiB.
If raidz2 capacity is estimated as (12-2) x 12.73 TiB it gives 127.31 TiB which I honestly expected my storage to be (creation.png). However the true available storage capacity is 116.24 TiB (pool_info.png).
I’ve double verified it using cli - the array is indeed 116 TiB.
If I use these two online calculators ( link1, link2 ) they give me results I actually see - 116 TiB instead of naive 127 TiB.
It’s not a critical issue, but an unpleasant one - it makes user think “WTF is going on, where did my space go?” and spend lots of time trying to get to the bottom of it and question the reliability of the system.