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Andrea Mazzoleni 2025-10-31 10:25:24 +01:00
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@ -145,11 +145,8 @@ https://blogs.technet.microsoft.com/tip_of_the_day/2014/07/23/tip-of-the-day-dua
<tr><td><span class="bold">Filled disks</span><br>Can you start with already filled disks?</td>
<td>Yes</td><td>Yes</a></td><td>No</td><td>No</td><td>No</td></tr>
<tr><td><span class="bold">Add disks</span><br>Can filled data disks be added later?</td>
<td>Yes</td><td>Yes</td><td>Yes</a></td><td>Yes</td><td>Yes</td></tr>
<tr><td><span class="bold">Always protected</span><br>Is existing data protected while adding new disk with data?</td>
<td>Yes</td><td>No <a href="#note4">[4]</a></td><td>Yes</a></td><td>Yes</td><td>Yes</td></tr>
<tr><td><span class="bold">Add filled disks</span><br>Can data disks that already contains data be added later?</td>
<td>Yes</td><td>No <a href="#note4">[4]</td><td>No</a></td><td>No</td><td>No</td></tr>
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Until 2024 it was "ZFS does't allow to add new disks to a raidz pool"
@ -200,9 +197,10 @@ ZFS also employs a suboptimal RAID-Z3 algorithm that requires roughly twice the
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<p>
<a id="note4">[4]</a> - unRAID completely rebuilds parity when adding a new disk that already contains data, and during this process <a href="https://youtu.be/frtauLMO3-c?t=803">the existing data in the array is not protected</a>.
<a id="note4">[4]</a> - unRAID 7.2 claims that it can add data disks to an existing array, but in reality, what it actually does is create a new array and rebuild the parity from scratch.
The key difference is that during this process, the data disks already in the array <a href="https://youtu.be/frtauLMO3-c?t=803">are not protected</a>.
This is a serious flaw, as a full parity rebuild puts considerable stress on all drives. If any disk is near failure, there’s a high risk it could fail during this operation.
The only safe way to add a new data disk is to pre-clear it first.
The only safe way to add a new data disk to an existing array is to pre-clear it first.
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<p>